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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	SYNA
Entity Registrant Name	SYNAPTICS INCORPORATED
Entity Central Index Key	0000817720
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,614,153

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Current Assets:
Cash and cash equivalents	$ 283.4	$ 367.8
Accounts receivable, net of allowances of $2.6 at March 31, 2018 and June 30, 2017	258.2	255.2
Inventories	108.5	131.4
Prepaid expenses and other current assets	16.0	37.6
Total current assets	666.1	792.0
Property and equipment at cost, net of accumulated depreciation of $129.1 and $106.8 at March 31, 2018 and June 30, 2017, respectively	118.7	113.8
Goodwill	404.2	206.8
Acquired intangibles, net	209.4	101.0
Non-current other assets	45.3	53.1
Total assets	1,443.7	1,266.7
Current Liabilities:
Accounts payable	132.1	135.8
Accrued compensation	18.2	31.9
Income taxes payable	16.7	17.2
Acquisition-related liabilities	8.7	8.7
Other accrued liabilities	91.2	101.8
Current portion of long-term debt		15.0
Total current liabilities	266.9	310.4
Long-term debt, net of issuance costs		202.0
Convertible notes, net	446.5
Deferred tax liabilities	6.1
Other long-term liabilities	28.3	14.1
Total liabilities	747.8	526.5
Stockholders' Equity:
$0.001 par value; 120,000,000 shares authorized, 62,234,111 and 60,579,911 shares issued, and 34,594,235 and 34,638,435 shares outstanding, at March 31, 2018 and June 30, 2017, respectively	0.1	0.1
Additional paid-in capital	1,160.3	1,004.8
Treasury stock: 27,639,876 and 25,941,476 common treasury shares at March 31, 2018 and June 30, 2017, respectively, at cost	(1,073.9)	(980.3)
Accumulated other comprehensive income	1.5	1.5
Retained earnings	607.9	714.1
Total stockholders' equity	695.9	740.2
Liabilities and stockholders' equity	$ 1,443.7	$ 1,266.7

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 2.6	$ 2.6
Property and equipment, accumulated depreciation	$ 129.1	$ 106.8
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	62,234,111	60,579,911
Common stock, shares outstanding	34,594,235	34,638,435
Common treasury shares	27,639,876	25,941,476

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net revenue	$ 394.0	$ 444.2	$ 1,241.8	$ 1,291.7
Cost of revenue	271.1	309.5	889.3	894.9
Gross margin	122.9	134.7	352.5	396.8
Operating expenses:
Research and development	93.7	71.6	273.0	218.5
Selling, general, and administrative	37.9	38.1	115.6	105.0
Acquired intangibles amortization	1.4	2.4	8.5	9.3
Restructuring	2.2	0.3	8.6	7.3
Litigation settlement charge		10.0		10.0
Total operating expenses	135.2	122.4	405.7	350.1
Operating income/(loss)	(12.3)	12.3	(53.2)	46.7
Interest and other expense, net	(4.7)	(1.5)	(15.4)	(1.8)
Income/(loss) before provision/(benefit) for income taxes and equity investment loss	(17.0)	10.8	(68.6)	44.9
Provision/(benefit) for income taxes	(3.9)	6.3	52.6	13.9
Equity investment loss	(0.6)		(1.4)
Net income/(loss)	$ (13.7)	$ 4.5	$ (122.6)	$ 31.0
Net income/(loss) per share:
Basic	$ (0.40)	$ 0.13	$ (3.61)	$ 0.89
Diluted	$ (0.40)	$ 0.13	$ (3.61)	$ 0.87
Shares used in computing net income/(loss) per share:
Basic	34.5	34.8	34.0	34.9
Diluted	34.5	35.4	34.0	35.7

Condensed Consolidated Statements of Comprehensive Income/ (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income/(loss)	$ (13.7)	$ 4.5	$ (122.6)	$ 31.0
Other comprehensive loss:
Change in unrealized net loss on investments				(1.5)
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments				(0.3)
Net current period-other comprehensive loss				(1.8)
Comprehensive income/(loss)	$ (13.7)	$ 4.5	$ (122.6)	$ 29.2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income/(loss)	$ (122.6)	$ 31.0
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Share-based compensation costs	53.1	46.3
Depreciation and amortization	28.6	25.0
Acquired intangibles amortization	62.0	45.2
Deferred taxes	16.8	(11.7)
Non-cash interest		(0.3)
Amortization of convertible debt discount and issuance costs	12.7
Amortization of debt issuance costs	1.5	0.8
Impairment recovery on investments		(1.9)
Equity investment loss	1.4
Foreign currency remeasurement loss	0.1
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	8.2	6.0
Inventories	102.2	(10.6)
Prepaid expenses and other current assets	20.9	(25.6)
Other assets	(7.2)	4.9
Accounts payable	(15.9)	1.6
Accrued compensation	(15.4)	(10.6)
Acquisition-related liabilities		(16.8)
Income taxes payable	1.8	(0.2)
Other accrued liabilities	(11.1)	21.4
Net cash provided by operating activities	137.1	104.5
Cash flows from investing activities
Acquisition of businesses, net of cash and cash equivalents acquired	(396.4)
Proceeds from sales of investments		7.5
Purchases of property and equipment	(27.5)	(26.1)
Purchase of intangible assets	(7.7)
Investment in direct financing lease		(15.8)
Net cash used in investing activities	(431.6)	(34.4)
Cash flows from financing activities
Proceeds from issuance of convertible debt, net of issuance costs	514.5
Payment of debt	(220.0)	(15.0)
Purchases of treasury stock	(93.6)	(88.0)
Proceeds from issuance of shares	15.0	14.7
Payment of debt issuance costs	(1.1)
Excess tax benefit from share-based compensation		1.6
Payroll taxes for deferred stock and market stock units	(4.8)	(5.5)
Net cash provided by/(used in) financing activities	210.0	(92.2)
Effect of exchange rate changes on cash and cash equivalents	0.1	(1.0)
Net decrease in cash and cash equivalents	(84.4)	(23.1)
Cash and cash equivalents at beginning of period	367.8	352.2
Cash and cash equivalents at end of period	283.4	329.1
Supplemental disclosures of cash flow information
Cash paid for taxes	26.0	21.5
Cash refund on taxes	1.0	10.0
Non-cash investing and financing activities:
Purchases of property and equipment in current liabilities	3.8	$ 2.5
Common stock issued pursuant to acquisition	$ 39.1

Basis of Presentation	9 Months Ended
Basis of Presentation	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	1. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission, or the SEC, and U.S. generally accepted accounting principles, or U.S. GAAP. Certain information or footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the financial statements include all adjustments, which are of a normal and recurring nature and necessary for the fair presentation of the results of the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the operating results for the full fiscal year or any future period. These financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended June 24, 2017. The consolidated financial statements include our financial statements and those of our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated upon consolidation. Our fiscal year is the 52- or 53-week period ending on the last Saturday in June. Our fiscal 2018 is a 53-week period ending June 30, 2018, and our fiscal 2017 was a 52-week period ending on June 24, 2017. The fiscal periods presented in this report are 13-week and 40-week periods for the three and nine months ended March 31, 2018, respectively, and 13-week and 39-week periods for the three and nine months ended March 25, 2017, respectively. For simplicity, the accompanying condensed consolidated financial statements have been shown as ending on calendar quarter end dates as of and for all periods presented, unless otherwise indicated. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, allowance for doubtful accounts, cost of revenue, inventories, loss on purchase commitments, product warranty, accrued liabilities, share-based compensation costs, provision for income taxes, deferred income tax asset valuation allowances, uncertain tax positions, goodwill, intangible assets, investments, contingent consideration liability and loss contingencies. We base our estimates on historical experience, applicable laws and regulations, and various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Foreign Currency Transactions and Foreign Exchange Contracts The U.S. dollar is our functional and reporting currency. We remeasure our monetary assets and liabilities not denominated in the functional currency into U.S. dollar equivalents at the rate of exchange in effect on the balance sheet date. We measure and record non-monetary balance sheet accounts at the historical rate in effect at the date of transaction. We remeasure foreign currency expenses at the weighted average exchange rate in the month that the transaction occurred. Our foreign currency transactions and remeasurement gains and losses are included in selling, general, and administrative expenses in the condensed consolidated statements of operations, and resulted in net losses of $0.3 million and $0.8 million in the three and nine months ended March 31, 2018 and net losses of $0.4 million in the three and nine months ended March 31, 2017.

Revenue Recognition	9 Months Ended
Revenue Recognition	Mar. 31, 2018
Revenue Recognition [Abstract]
Revenue Recognition	2. Revenue Recognition We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, delivery has occurred and title has transferred, the price is fixed or determinable, and collection is reasonably assured. We accrue for estimated sales returns, incentives, and other allowances at the time we recognize revenue. Our products contain embedded firmware and software, which together with, or consisting of, our ASIC chip, deliver the essential functionality of our products and, as such, software revenue recognition guidance is not applicable. The majority of our sales to distributors are made under agreements that generally do not provide for price adjustments after purchase and revenue recognition and provide for only limited return rights under product warranty. Revenue on these sales is recognized in the same manner as sales to our non-distributor customers. Some of our sales are to distributors which have limited stock rotation rights, which allow them to rotate a small portion of product in their inventory a maximum of two times per year. We recognize revenue to these distributors upon shipment of product to the distributor, as the stock rotation rights are limited and we can reasonably estimate expected product returns when right of return exists. When sales rebates, price allowances and stock rotations are applicable, they are estimated and recorded in the period the related revenue is recognized.

Net Income Per Share

9 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Income Per Share

3. Net Income Per Share

The computation of basic and diluted net income per share was as follows (in millions, except per share data):

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018			2017		2018			2017
Numerator:
Net income/(loss)	$	(13.7	)	$	4.5	$	(122.6	)	$	31.0
Denominator:
Shares, basic		34.5			34.8		34.0			34.9
Effect of dilutive share-based awards		-			0.6		-			0.8
Shares, diluted		34.5			35.4		34.0			35.7
Net income/(loss) per share:
Basic	$	(0.40	)	$	0.13	$	(3.61	)	$	0.89
Diluted	$	(0.40	)	$	0.13	$	(3.61	)	$	0.87

Our basic net income per share amounts for each period presented have been computed using the weighted average number of shares of common stock outstanding over the period measured. Our diluted net income per share amounts for each period presented include the weighted average effect of potentially dilutive shares. We use the “treasury stock” method to determine the dilutive effect of our stock options, deferred stock units, or DSUs, market stock units, or MSUs, performance stock units, or PSUs, and our convertible notes.

Dilutive net income per share amounts do not include the potential weighted average effect of 2,818,358 and 2,380,552 shares of common stock related to certain share-based awards that were outstanding during the three months ended March 31, 2018 and 2017, respectively, and 2,427,566 and 1,739,783 shares of common stock related to certain share-based awards that were outstanding during the nine months ended March 31, 2018, and 2017, respectively. These share-based awards were not included in the computation of diluted net income per share because their effect would have been antidilutive.

Fair Value

9 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value

4. Fair Value

Financial assets measured at fair value on a recurring basis by level within the fair value hierarchy, consisted of the following (in millions):

	March 31,						June 30,
	2018						2017
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets:
Money market funds	$	259.0	$	-	$	-	$	361.7	$	-	$	-
Auction rate securities		-		-		1.5		-		-		1.5
Total available-for-sale securities	$	259.0	$	-	$	1.5	$	361.7	$	-	$	1.5

In our condensed consolidated balance sheets, as of March 31, 2018 and June 30, 2017, money market balances were included in cash and cash equivalents, and auction rate securities, or ARS investments, were included in non-current other assets.

There were no changes in fair value of our Level 3 financial assets during the nine months ended March 31, 2018. There were no transfers in or out of our Level 1, 2, or 3 assets during the nine months ended March 31, 2018 and 2017.

The fair values of our accounts receivable and accounts payable approximate their carrying values because of the short-term nature of those instruments. Intangible assets, property and equipment, and goodwill are measured at fair value on a non-recurring basis if impairment is indicated.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventories

9 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

5. Inventories

Inventories are stated at the lower of cost (first-in, first-out method) or net realizable value and consisted of the following (in millions):

	March 31,		June 30,
	2018		2017
Raw materials and work-in-progress	$	71.4	$	94.7
Finished goods		37.1		36.7
	$	108.5	$	131.4

We record a write-down, if necessary, to reduce the carrying value of inventory to its net realizable value. The effect of these write-downs is to establish a new cost basis in the related inventory, which we do not subsequently write up. We also record a liability and charge to cost of revenue for estimated losses on inventory we are obligated to purchase from our contract manufacturers when such losses become probable from customer delays, order cancellations, or other factors.

Acquisitions

9 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Acquisitions

6. Acquisitions

Conexant

On June 11, 2017, we entered into a securities purchase agreement to acquire all of the outstanding limited liability company interests of Conexant Systems, LLC, or Conexant, a technology leader in voice and audio processing solutions for the smart home, or the Conexant Acquisition. The Conexant Acquisition is intended to increase our presence in the smart home market and increase opportunities to grow revenue. Effective July 25, 2017, or the Conexant Closing Date, we completed the Conexant Acquisition for an initial purchase price of (i) $305.4 million in cash (on a cash-free, debt-free basis) and (ii) 726,666 shares of our common stock, or the Stock Consideration, valued at $39.1 million, and (iii) the assumption of a $3.5 million stock appreciation rights liability, with $16.8 million of the purchase price held in escrow to secure the seller’s indemnification obligations under the purchase agreement and $7.0 million of the purchase price held in escrow to secure the seller’s adjustment escrow obligations under the purchase agreement. Subsequently, we determined that $1.8 million of net adjustments to the purchase price were required, reducing the acquisition date fair value of the consideration transferred to a total of $346.2 million. The Stock Consideration was issued at closing in an exempt private placement. On August 4, 2017, we filed a shelf registration statement on Form S-3 with the SEC providing for the registered resale of the Stock Consideration.

The acquisition has been accounted for using the purchase method of accounting in accordance with the business acquisition guidance. Under the purchase accounting method, the total estimated purchase consideration of the acquisition was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their relative fair values. The excess of the purchase consideration over the net tangible and identifiable intangible assets acquired and liabilities has been recorded as goodwill. Our estimate of the fair values of the acquired intangible assets at March 31, 2018, is preliminary and subject to change and is based on established and accepted valuation techniques performed with the assistance of our third-party valuation specialists. Additional information, which existed as of the Conexant Closing Date but is yet unknown to us, may become known to us during the remainder of the measurement period, which will not exceed 12 months from the Conexant Closing Date. Changes to amounts recorded as inventory, other current assets, acquired intangible assets and other accrued liabilities will be recorded as adjustments to the provisional amounts recognized as of the Conexant Closing Date and may result in a corresponding adjustment to goodwill in the period in which new information becomes available.

The following table summarizes the provisional amounts recorded for the estimated fair values of the assets acquired and liabilities assumed as of the Conexant Closing Date (in millions):

Cash	$	4.3
Accounts receivable		11.7
Inventory		51.0
Other current assets		3.5
Property and equipment		3.2
Acquired intangible assets		116.9
Other assets		0.9
Total identifiable assets acquired		191.5
Accounts payable		14.2
Accrued compensation		1.3
Other accrued liabilities		9.0
Other long-term liabilities		3.0
Net identifiable assets acquired		164.0
Goodwill		182.2
Net assets acquired	$	346.2

As of September 30, 2017, and December 30, 2017, the preliminary estimate of the intangible assets was $152.5 million. As of March 31, 2018, we have revised our preliminary estimate of the intangible assets to $116.9 million which resulted in a $35.6 million reduction to the intangible assets and a corresponding increase to goodwill. As a result, a $2.2 million increase in operating income/(loss) related to the six months ended December 30, 2017, was recognized in the condensed consolidated statement of operations for the three months ended March 31, 2018. The change in operating income/(loss) was primarily attributed to a decrease of $0.9 million to cost of revenue related to the amortization of acquired intangible assets and a decrease of $1.3 million in operating expenses related to the amortization of acquired intangible assets.

The revised preliminary estimate of the intangible assets as of March 31, 2018, totaling $116.9 million included the following: $93.2 million was allocated to developed technology and will amortize over an estimated weighted average useful life of 5 years; $21.7 million was allocated to customer relationships and will be amortized over an estimated useful life of 4 years, $1.7 million was allocated to trademarks and will be amortized over an estimated useful life of 7 years; and $0.3 million was allocated to backlog and will be amortized over an estimated useful life of less than 1 year. Developed technology consists of semiconductor system solutions for audio and imaging applications. We preliminarily estimated the fair value of the identified intangible assets using a discounted cash flow model for each of the underlying identified intangible assets. These fair value measurements were based on significant inputs not observable in the market and thus represent a Level 3 measurement. Key assumptions include the level and timing of expected future cash flows, conditions and demands specific to each intangible asset over its remaining useful life, and discount rates we believe to be consistent with the inherent risks associated with each type of asset, which range from 8% to 12%. The fair value of these intangible assets is primarily affected by the projected income and the anticipated timing of the projected income associated with each intangible asset coupled with the discount rates used to derive their estimated present values. We believe the level and timing of expected future cash flows appropriately reflects market participant assumptions.

The value of goodwill reflects the anticipated synergies of the combined operations and workforce of Conexant as of the Conexant Closing Date.

As of March 31, 2018, all of the goodwill is expected to be deductible for income tax purposes.

Prior to the Conexant Acquisition, we did not have an existing relationship or transactions with Conexant.

The condensed consolidated financial statements include approximately $87.8 million of revenue and approximately $34.7 million of operating loss from Conexant from the Conexant Closing Date through March 31, 2018.

The following unaudited pro forma financial information (in millions, except per share data) presents the combined results of operations for us and Conexant as if the Conexant Acquisition had occurred on June 30, 2016. The unaudited pro forma financial information has been prepared for comparative purposes only and does not purport to be indicative of the actual operating results that would have been recorded had the Conexant Acquisition actually taken place on June 30, 2016, and should not be taken as indicative of future consolidated operating results. Additionally, the unaudited pro forma financial results do not include any anticipated synergies or other expected benefits from the Conexant Acquisition.

	Three Months Ended						Nine Months Ended
	March 31,						March 31,
	2018			2017			2018			2017
Revenue	$	394.0		$	469.1		$	1,249.9		$	1,372.0
Net income/(loss)		(13.8	)		(0.4	)		(122.4	)		19.8
Net income/(loss) per share		(0.40	)		(0.01	)		(3.60	)		0.57

Pro forma adjustments used to arrive at pro forma net income for the three and nine months ended March 31, 2018, and 2017, were as follows (in millions):

	Three Months Ended						Nine Months Ended
	March 31,						March 31,
	2018			2017			2018			2017
Buyer transaction costs	$	-		$	-		$	0.9		$	-
Interest expense		-			(4.5	)		-			(13.6	)
Intangible amortization		-			(6.1	)		(1.7	)		(16.5	)
Depreciation		(0.2	)		(0.2	)		(0.3	)		(0.7	)
Income tax adjustment		0.1			3.8			0.3			10.8
Total	$	(0.1	)	$	(7.0	)	$	(0.8	)	$	(20.0	)

Marvell Multimedia Solutions Business

On June 11, 2017, the Company entered into an asset purchase agreement to acquire the assets of the multimedia solutions business of Marvell Technology Group Ltd., or Marvell, a leading provider of advanced video and audio processing applications for the smart home, or the Marvell Business Acquisition. The Marvell Business Acquisition is also intended to increase our presence in the smart home market and increase opportunities to grow revenue. Effective September 8, 2017, or the Marvell Closing Date, we completed the Marvell Business Acquisition for a purchase price of $93.7 million in cash.

The acquisition has been accounted for using the purchase method of accounting in accordance with the business acquisition guidance. Under the purchase accounting method, the total estimated purchase consideration of the acquisition was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their relative fair values. The excess of the purchase consideration over the net tangible and identifiable intangible assets acquired and liabilities has been recorded as goodwill. Our estimate of the fair values of the acquired intangible assets at March 31, 2018, is preliminary and subject to change and is based on established and accepted valuation techniques performed with the assistance of our third-party valuation specialists. Additional information, which existed as of the Marvell Closing Date but is yet unknown to us, may become known to us during the remainder of the measurement period, which will not exceed 12 months from the Marvell Closing Date. Changes to amounts recorded as inventory and acquired intangible assets will be recorded as adjustments to the provisional amounts recognized as of the Marvell Closing Date and may result in a corresponding adjustment to goodwill in the period in which new information becomes available.

The following table summarizes the provisional amounts recorded for the estimated fair values of the assets acquired and liabilities assumed as of the Marvell Business Acquisition date (in millions):

Inventory	$	28.4
Property and equipment		5.0
Acquired intangible assets		45.7
Total identifiable assets acquired		79.1
Accrued liabilities		0.7
Net identifiable assets acquired		78.4
Goodwill		15.3
Net assets acquired	$	93.7

Of the $45.7 million of acquired intangible assets, $24.9 million was allocated to developed technology and will be amortized over an estimated weighted average useful life of 4 years; $16.2 million was allocated to customer relationships and will be amortized over an estimated useful life of 4 years, $1.0 million was allocated to backlog and will be amortized over an estimated useful life of less than 1 year; and $3.6 million was allocated to in-process research and development and will be amortized over an estimated useful life to be determined at the date the underlying projects are deemed to be substantively complete. Developed technology consists of semiconductor system solutions for advanced video and audio processing applications. We preliminarily estimated the fair value of the identified intangible assets using a discounted cash flow model for each of the underlying identified intangible assets. These fair value measurements were based on significant inputs not observable in the market and thus represent a Level 3 measurement. Key assumptions include the level and timing of expected future cash flows, conditions and demands specific to each intangible asset over its remaining useful life, and discount rates we believe to be consistent with the inherent risks associated with each type of asset, which range from 9% to 19%. The fair value of these intangible assets is primarily affected by the projected income and the anticipated timing of the projected income associated with each intangible asset coupled with the discount rates used to derive their estimated present values. We believe the level and timing of expected future cash flows appropriately reflects market participant assumptions.

The value of goodwill reflects the anticipated synergies of the combined operations and workforce of the transferred Marvell Business assets as of the Marvell Closing Date.

As of March 31, 2018, all of the goodwill is expected to be deductible for income tax purposes.

Prior to the Marvell Business Acquisition, we did not have an existing relationship or transactions with Marvell.

The condensed consolidated financial statements include approximately $98.1 million of revenue and approximately $12.7 million of operating loss from Marvell from the Marvell Closing Date through March 31, 2018.

The following unaudited pro forma financial information (in millions, except per share data) presents the combined results of operations for us and Marvell as if the Marvell Business Acquisition had occurred on June 30, 2016. The unaudited pro forma financial information has been prepared for comparative purposes only and does not purport to be indicative of the actual operating results that would have been recorded had the Marvell Business Acquisition actually taken place on June 30, 2016, and should not be taken as indicative of future consolidated operating results. Additionally, the unaudited pro forma financial results do not include any anticipated synergies or other expected benefits from the Marvell Business Acquisition. As the Marvell Business Acquisition was an asset acquisition and only a portion of Marvell Multimedia Solutions Business was acquired, the unaudited pro forma financial information has been prepared using certain estimates.

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018			2017		2018			2017
Revenue	$	394.0		$	469.1	$	1,345.2		$	1,367.1
Net income/(loss)		(13.7	)		15.0		(121.3	)		19.8
Net income/(loss) per share		(0.40	)		0.45		(3.57	)		0.58

Pro forma adjustments used to arrive at pro forma net loss for the three and nine months ended March 31, 2018 and 2017, were as follows (in millions):

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018		2017			2018			2017
Buyer transaction costs	$	-	$	-		$	1.1		$	-
Interest expense		-		(4.9	)		-			(14.7	)
Intangible amortization		-		(5.6	)		(1.2	)		(7.3	)
Income tax adjustment		-		3.7			-			7.7
Total	$	-	$	(6.8	)	$	(0.1	)	$	(14.3	)

Acquired Intangibles and Goodwill

9 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Acquired Intangibles and Goodwill

7. Acquired Intangibles and Goodwill

Acquired Intangibles

The following table summarizes the life, the gross carrying value and the related accumulated amortization of our acquired intangible assets as of March 31, 2018 and June 30, 2017 (in millions):

	Weighted Average Life in Years		March 31, 2018			June 30, 2017
Display driver technology		5.3	$	164.0		$	164.0
Audio and video technology		4.7		118.2			-
Customer relationships		3.6		66.2			48.4
Fingerprint authentication technology		4.0		55.7			63.5
Licensed technology and other		4.3		9.0			1.3
Tradename		7.0		1.7			-
Patents		7.7		4.6			4.8
Backlog		0.5		1.3			-
In-process research and development	Not applicable			3.6			-
Acquired intangibles, gross		4.6		424.3			282.0
Accumulated amortization				(214.9	)		(181.0	)
Acquired intangibles, net			$	209.4		$	101.0

The total amortization expense for the acquired intangible assets was $18.7 million and $14.0 million for the three months ended March 31, 2018 and 2017, respectively, and $62.0 million and $45.2 million for the nine months ended March 31, 2018 and 2017, respectively. During the three months ended March 31, 2018 and 2017, $17.2 million and $11.7 million, respectively, and $53.4 million and $35.9 million for the nine months ended March 31, 2018 and 2017, respectively, of amortization expense was included in our condensed consolidated statements of operations in cost of revenue; the remainder was included in acquired intangibles amortization.

The following table presents expected annual fiscal year aggregate amortization expense as of March 31, 2018 (in millions):

Remainder of 2018	$	20.9
2019		71.7
2020		48.2
2021		35.3
2022		25.8
2023		3.2
Thereafter		0.7
To be determined		3.6
Future amortization	$	209.4

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired. Changes in our goodwill balance for the nine months ended March 31, 2018 were as follows (in millions):

Beginning balance	$	206.8
Acquisition activity		157.3
Post-acquisition adjustments		40.1
Ending balance	$	404.2

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Other Accrued Liabilities

9 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Other Accrued Liabilities

8. Other Accrued Liabilities

Other accrued liabilities consisted of the following (in millions):

	March 31,		June 30,
	2018		2017
Customer obligations	$	30.9	$	34.8
Inventory obligations		27.0		41.8
Warranty		6.5		4.4
Other		26.8		20.8
	$	91.2	$	101.8

Indemnifications, Contingencies and Legal Proceedings	9 Months Ended
Indemnifications, Contingencies and Legal Proceedings	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Indemnifications, Contingencies and Legal Proceedings	9. Indemnifications, Contingencies and Legal Proceedings Indemnifications In connection with certain agreements, we are obligated to indemnify the counterparty against third party claims alleging infringement of certain intellectual property rights by us. We have also entered into indemnification agreements with our officers and directors. Maximum potential future payments under these agreements cannot be estimated because these agreements do not have a maximum stated liability. However, historical costs related to these indemnification provisions have not been significant. We have not recorded any liability in our condensed consolidated financial statements for such indemnification obligations. Contingencies We have in the past, and may in the future receive notices from third parties that claim our products infringe their intellectual property rights. We cannot be certain that our technologies and products do not and will not infringe issued patents or other proprietary rights of third parties. Any infringement claims, with or without merit, could result in significant litigation costs and diversion of management and financial resources, including the payment of damages, which could have a material adverse effect on our business, financial condition, and results of operations. Legal Proceedings In October 2015, Amkor Technology, or Amkor, filed a complaint against us alleging infringement of intellectual property rights and various other claims. In November 2015, we filed an indemnification claim against the former stockholders and option holders of Validity Sensors, Inc., or Validity, to secure our rights under the Agreement and Plan of Reorganization between us and Validity (the “Validity Agreement”). Pursuant to the Validity Agreement, we believe we can offset costs, damages and settlements incurred in connection with our defense and resolution of the complaint with Amkor against the contingent consideration earnout balance of $8.7 million and have classified the reserve balance as a current acquisition-related liability in our condensed consolidated balance sheet. In April 2017, we agreed to settle this case with Amkor on undisclosed terms that include each party licensing and assigning certain intellectual property rights, and cash payments. Settlement costs incurred in connection with this litigation have been recorded in our condensed consolidated financial statements in fiscal 2017 and all but an immaterial amount was paid during our fiscal 2017. The indemnification claim against the former stockholders and option holders of Validity is in arbitration and remains outstanding.

Debt

9 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

10. Debt

Convertible Debt

On June 20, 2017, we entered into a purchase agreement, or the Purchase Agreement, with Wells Fargo Securities, LLC, as representative of the initial purchasers named therein, or collectively, the Initial Purchasers, pursuant to which we agreed to issue and sell, and the Initial Purchasers agreed to purchase, $500 million aggregate principal amount of our 0.50% convertible senior notes due 2022, or the Notes, in a private placement transaction. Pursuant to the Purchase Agreement, we also granted the Initial Purchasers a 30-day option to purchase up to an additional $25 million aggregate principal amount of Notes, which was exercised in full on June 21, 2017. The net proceeds, after deducting the Initial Purchasers’ discounts, were $514.5 million, which includes proceeds from the Initial Purchasers’ exercise of their option to purchase additional Notes. We received the net proceeds on June 26, 2017, which we used to repurchase 1,698,400 shares of our common stock, to retire our outstanding bank debt, and to provide additional cash resources to fund the Conexant and Marvell Business Acquisitions.

The Notes bear interest at a rate of 0.50% per year. Interest accrued from June 26, 2017 and is payable semi-annually in arrears, on June 15 and December 15 of each year, beginning on December 15, 2017. The Notes are senior unsecured obligations and rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment to any our liabilities that are not so subordinated; effectively junior in right of payment to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of our subsidiaries.

The Notes mature on June 15, 2022, or the Maturity Date, unless earlier repurchased, redeemed or converted.

Holders may convert all or any portion of their Notes, in multiples of $1,000 principal amounts, at their option at any time prior to the close of business on the business day immediately preceding March 15, 2022 under certain defined circumstances.

On or after March 15, 2022 until the close of business on the business day immediately preceding the Maturity Date, holders may convert all or any portion of their Notes, in multiples of $1,000 principal amounts, at the option of the holder. Upon conversion, we will pay or deliver, at our election, shares of common stock, cash, or a combination of cash and shares of common stock.

The conversion rate for the Notes is initially 13.6947 shares of common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $73.02 per share of common stock). The conversion rate is subject to adjustment in certain circumstances.

Upon the occurrence of a fundamental change (as defined in the Notes indenture), holders of the Notes may require us to repurchase for cash all or a portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the fundamental change repurchase date.

We may not redeem the Notes prior to June 20, 2020. We may redeem for cash all or any portion of the Notes, at our option, on or after June 20, 2020, if the last reported sale price of our common stock, as determined by us, has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest up to, but excluding, the redemption date. Our policy is to settle the principal amount of our Notes with cash upon conversion or redemption.

As of the issuance date of the Notes, we recorded $82.1 million of the principal amount to equity, representing the debt discount for the difference between our estimated nonconvertible debt borrowing rate of 4.39% and the coupon rate of the Notes of 0.50% using a five-year life, which coincides with the term of the Notes. In addition, we allocated the total of $11.1 million of debt issuance costs, consisting of the Initial Purchaser’s discount of $10.5 million and legal, accounting, and printing costs of $579,000, pro rata, to the equity and debt components of the Notes, or $1.9 million and $9.2 million, respectively. The debt discount and the debt issuance costs allocated to the debt component are amortized as interest expense using the effective interest method over five years.

The contractual interest expense and amortization of discount on the Notes for the nine months ended March 31, 2018, were as follows (in millions):

	Nine Months Ended
	March 31,
	2018
Interest expense	$	2.0
Amortization of discount and debt issuance costs		12.7
Total interest	$	14.7

The unamortized amounts of the debt issuance costs and discount associated with the Notes as of March 31, 2018 were $7.9 million and $70.7 million, respectively.

Revolving Credit Facility and Term Loan Arrangement

At the end of fiscal 2017, we had $220.0 million principal outstanding under our credit agreement (as discussed in the notes to consolidated financial statements included in our Form 10-K filed for the year ended June 24, 2017) consisting of $100.0 million under our revolving credit facility and $120.0 million under our term loan arrangement. At the beginning of fiscal 2018, we issued $525.0 million principal amount of convertible senior notes, or the Notes, and utilized a portion of the proceeds from our Notes to retire the outstanding principal and interest balances on our revolving credit facility and our term loan arrangement. At the end of July 2017, we made an election to reduce the commitment under the revolving credit facility from $450.0 million to $250.0 million as we were able to complete the Conexant Acquisition with available cash.

In September 2017, we entered into an Amendment and Restatement Agreement, or the Agreement, with the lenders that are party thereto, or the Lenders, and Wells Fargo Bank, National Association, as administrative agent for the Lenders. The Agreement terminated our term loan arrangement and provides for a revolving credit facility in a principal amount of up to $200 million, which includes a $20 million sublimit for letters of credit and a $20 million sublimit for swingline loans. Under the terms of the Agreement, we may, subject to the satisfaction of certain conditions, request increases in the revolving credit facility commitments in an aggregate principal amount of up to $100 million to the extent existing or new lenders agree to provide such increased or additional commitments, as applicable. Proceeds under the revolving credit facility are available for working capital and general corporate purposes. As of March 31, 2018, there is no balance outstanding under the revolving credit facility. As a result of terminating our term loan arrangement, we expensed the remaining debt issuance costs attributable to the term loan of $1.0 million during the first quarter of fiscal 2018.

The revolving credit facility is required to be repaid in full on the earlier of (i) September 27, 2022 and (ii) the date 91 days prior to the Maturity Date of the Notes if the Notes have not been refinanced in full by such date. Debt issuance costs of $2.3 million will be amortized over 60 months.

Our obligations under the Agreement are guaranteed by the material domestic subsidiaries of our company, subject to certain exceptions (such material subsidiaries, together with our company, collectively, the Credit Parties). The obligations of the Credit Parties under the Agreement and the other loan documents delivered in connection therewith are secured by a first priority security interest in substantially all of the existing and future personal property of the Credit Parties, including, without limitation, 65% of the voting capital stock of certain of the Credit Parties’ direct foreign subsidiaries, subject to certain exceptions.

The revolving credit facility bears interest at our election of a Base Rate plus an Applicable Margin or LIBOR plus an Applicable Margin. Swingline loans bear interest at a Base Rate plus an Applicable Margin. The Base Rate is a floating rate that is the greater of the Prime Rate, the Federal Funds Rate plus 50 basis points, or LIBOR plus 100 basis points. The Applicable Margin is based on a sliding scale which ranges from 0.25 to 100 basis points for Base Rate loans and 100 basis points to 175 basis points for LIBOR loans. We are required to pay a commitment fee on any unused commitments under the Agreement which is determined on a leverage-based sliding scale ranging from 0.175% to 0.25% per annum. Interest and fees are payable on a quarterly basis. There is no balance outstanding under the revolving credit facility.

Under the Agreement, there are various restrictive covenants, including three financial covenants which limit the consolidated total leverage ratio, or leverage ratio, the consolidated interest coverage ratio, or interest coverage ratio, a restriction which places a limit on the amount of capital expenditures that may be made in any fiscal year, a restriction that permits up to $50 million per fiscal quarter of accounts receivable financings, and sets the Specified Leverage Ratio. The leverage ratio is the ratio of debt as of the measurement date to earnings before interest, taxes, depreciation and amortization, or EBITDA, for the four consecutive quarters ending with the quarter of measurement. The current leverage ratio shall not exceed 3.50 to 1.00 provided that for the four fiscal quarters ending after the date of a material acquisition, such maximum leverage ratio shall be adjusted to 3.75 to 1.00, and thereafter, shall not be more than 3.50 to 1.00. The interest coverage ratio is EBITDA to interest expense for the four consecutive quarters ending with the quarter of measurement. The interest coverage ratio must not be less than 3.50 to 1.0 during the term of the Agreement. The Specified Leverage Ratio is the ratio used in determining, among other things, whether we are permitted to make dividends and/or prepay certain indebtedness, at a fixed ratio of 3.00 to 1.00. As of the end of the quarter, we were in compliance with the restrictive covenants.

Share-Based Compensation

9 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

11. Share-Based Compensation

During the three months ended September 30, 2017, we adopted the accounting standard update, or ASU, for Compensation-Stock Compensation which was issued by the Financial Accounting Standards Board, or FASB. This update simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. Upon adoption of this ASU, we elected to change our accounting policy to account for forfeitures as they occur and we applied the accounting policy change on a modified retrospective basis. As a result of the adoption of this ASU, we recognized the net cumulative effect of this change as a $24.7 million increase to retained earnings, a $1.0 million increase to additional paid-in capital and established an additional $25.7 million of deferred tax assets for research credit and alternative minimum tax credit carryforwards. We have reflected excess tax benefits for share-based payments in the statement of cash flows as operating activities rather than financing activities on a prospective basis and therefore prior periods have not been adjusted.

Share-based compensation and the related tax benefit recognized in our condensed consolidated statements of operations were as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Cost of revenue	$	0.9	$	0.6	$	2.3	$	1.7
Research and development		10.0		8.7		28.9		25.0
Selling, general, and administrative		7.9		6.8		21.9		19.6
Total	$	18.8	$	16.1	$	53.1	$	46.3
Income tax benefit on share-based compensation	$	3.4	$	4.1	$	6.1	$	12.1

Historically, we have issued new shares in connection with our share-based compensation plans, however, treasury shares are also available for issuance. Any additional shares repurchased under our common stock repurchase program will be available for issuance under our share-based compensation plans.

Stock Options

Stock option activity, including stock options granted, exercised, and forfeited, weighted average exercise prices for stock options outstanding and exercisable, and the aggregate intrinsic value were as follows:

	Stock			Weighted		Aggregate
	Option			Average		Intrinsic
	Awards			Exercise		Value
	Outstanding			Price		(in millions)
Balance as of June 30, 2017		2,490,168		$	49.20
Granted		61,825			45.32
Exercised		(359,541	)		22.87
Forfeited		(180,812	)		64.39
Balance as of March 31, 2018		2,011,640			52.42	$	13.3
Exercisable at March 31, 2018		1,702,535			51.07	$	13.3

The aggregate intrinsic value was determined using the closing price of our common stock on March 29, 2018 of $45.73 and excludes the impact of stock options that were not in-the-money.

Deferred Stock Units

DSU activity, including DSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of DSUs were as follows:

				Aggregate
	DSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2017		1,320,798
Granted		1,291,303
Delivered		(480,778	)
Forfeited		(205,364	)
Balance as of March 31, 2018		1,925,959		$	88.1

The aggregate intrinsic value was determined using the closing price of our common stock on March 29, 2018 of $45.73.

Of the shares delivered, 123,583 shares valued at $4.8 million were withheld to meet statutory tax withholding requirements.

Market Stock Units

Our Amended and Restated 2010 Incentive Compensation Plan provides for the grant of MSU awards to our employees, consultants, and directors. An MSU is a promise to deliver shares of our common stock at a future date based on the achievement of market-based performance requirements in accordance with the terms of the MSU grant agreement.

We have granted MSUs to our executive officers and other management members, which are designed to vest in three tranches with the target quantity for each tranche equal to one-third of the total MSU grant. The first tranche vests based on a one-year performance period; the second tranche vests based on a two-year performance period; and the third tranche vests based on a three-year performance period. Performance is measured based on the achievement of a specified level of total stockholder return, or TSR, relative to the TSR of the S&P Semiconductor Select Industry Index, or SPSISC Index for grants beginning in fiscal 2018 and relative to the Philadelphia Semiconductor Index, or SOX Index, for grants made prior to fiscal 2018. The potential payout ranges from 0% to 200% of the grant target quantity and is adjusted on a two-to-one ratio based on our TSR performance relative to the SPSISC Index TSR or SOX Index TSR using the following formula:

(100% + ([Synaptics TSR — {SPSISC Index TSR or SOX Index TSR}] x 2))

The payout for the first tranche and the second tranche will not exceed 100% and the payout for the third tranche will be calculated based on the total target quantity for the entire grant multiplied by the payout factor, based on performance for the three-year performance period, which will then be reduced by shares issued for the first tranche and the second tranche.

Delivery of shares earned, if any, will take place on the dates provided in the applicable MSU grant agreement, assuming the grantee is still an employee, consultant, or director of our company at the end of the applicable performance period. On the delivery date, we withhold shares to cover statutory tax withholding requirements and deliver a net quantity of shares to the employee, consultant, or director after such withholding. Until delivery of shares, the grantee has no rights as a stockholder with respect to any shares underlying the MSU award.

During the nine months ended March 31, 2018, MSU activity, including MSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of MSUs as of March 31, 2018 was as follows:

				Aggregate
	MSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2017		158,596
Granted		300,071
Performance adjustment		(68,003	)
Delivered		-
Forfeited		(35,938	)
Balance as of March 31, 2018		354,726		$	16.2

We value MSUs using the Monte Carlo simulation model on the date of grant and amortize the compensation expense over the three-year performance and service period on a straight-line basis. The unrecognized share-based compensation cost of our outstanding MSUs was approximately $16.9 million as of March 31, 2018, which will be recognized over a weighted average period of approximately 1.4 years.

Performance Stock Units

Our Amended and Restated 2010 Incentive Compensation Plan provides for the grant of PSU awards to our employees, consultants, and directors. A PSU is a promise to deliver shares of our common stock at a future date based on the achievement of performance-based requirements in accordance with the terms of the PSU grant agreement.

We have granted PSUs to our executive officers and other management members, which are designed to vest in three tranches with the target quantity for each tranche equal to one-third of the total PSU grant. The grants have a specific one-year performance period and vesting occurs over three service periods with the final service period ending approximately three years from the grant date. Performance is measured based on the achievement of a specified level of non-GAAP earnings per share. The potential payout ranges from 0% to 200% of the grant target quantity and is adjusted on a linear basis with a payout triggering if our non-GAAP earnings per share equals greater than 65% of the target with a maximum payout achieved at 135% of target.

Delivery of shares earned, if any, will take place on the dates provided in the applicable PSU grant agreement, assuming the grantee is still an employee, consultant, or director of our company at the end of the applicable service period. On the delivery date, we withhold shares to cover statutory tax withholding requirements and deliver a net quantity of shares to the employee, consultant, or director after such withholding. Until delivery of shares, the grantee has no rights as a stockholder with respect to any shares underlying the PSU award.

During the nine months ended March 31, 2018, there were 315,380 PSUs granted, 20,839 PSUs forfeited, and no PSUs were delivered. The aggregate intrinsic value of all outstanding PSUs as of March 31, 2018 was $13.5 million.

We value PSUs using the aggregate intrinsic value on the date of grant and amortize the compensation expense over the three-year service period on a ratable basis, dependent upon the probability of meeting the performance measures. The unrecognized share-based compensation cost of our outstanding PSUs was approximately $9.4 million as of March 31, 2018, which will be recognized over a weighted average period of approximately 1.7 years.

Employee Stock Purchase Plan

Shares purchased, weighted average purchase price, cash received, and the aggregate intrinsic value for employee stock purchase plan purchases during the nine months ended March 31, 2018 were as follows (in millions, except for shares purchased and weighted average price):

Shares purchased		210,798
Weighted average purchase price	$	32.17
Cash received	$	6.8
Aggregate intrinsic value	$	1.2

Income Taxes	9 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes On December 22, 2017, the U.S. government enacted comprehensive tax legislation, commonly known as the Tax Cuts and Jobs Act of 2017, or the Act, which significantly reforms the Internal Revenue Code of 1986, as amended. The Act contains broad and complex changes to corporate taxation, including, in part, reduction of the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously considered permanently reinvested, and creates new taxes on certain foreign sourced earnings. As our accounting and tax year is the fiscal period ending on the last Saturday in June, U.S. federal tax law requires that taxpayers with a fiscal year that spans the effective date of a rate change to calculate a blended tax rate based on the pro rata number of days in the fiscal year before and after the effective date. As a result, our U.S. federal tax rate for fiscal 2018 is a days-weighted blended tax rate of 28.17%. For fiscal 2019 and subsequent tax years, our U.S. federal tax rate will be 21%. As of March 31, 2018, we have not finalized our accounting for the tax impact of the Act; however, in certain cases, we have made a reasonable estimate of the impact of the enactment. In cases where we have not been able to make a reasonable estimate, we continue to account for those items based on our existing accounting policies. For those items in which we could determine a reasonable estimate, namely the one-time transition tax and the remeasurement of deferred tax at the new tax rate, we recognized provisional tax expense of $46.2 million, which is included as a component of provision for income tax expenses in the nine months ended March 31, 2018. Of the $46.2 million provisional tax expense, $54.4 million was for discrete tax expense items consisting of the one-time transition tax and the remeasurement of the beginning balance of U.S. federal deferred tax assets, partially offset by a non-discrete tax benefit of $8.2 million, which has an impact of 10.6% on our annual effective tax rate. In the quarter the Act was enacted, we remeasured our U.S. federal deferred tax assets and liabilities based on the tax rates at which they are expected to reverse in the future and recorded a discrete tax provision of $5.1 million. The one-time transition tax is based on our post-1986 foreign earnings and profits, or E&P, which we have previously excluded from U.S. income taxes due to our position that we would permanently reinvest future earnings. The one-time transition tax is applied at a 15.5% tax rate on cash assets and an 8% tax rate for other specified assets. We recorded a provisional amount for our one-time transition tax liability for our foreign subsidiaries, resulting in an increase in income tax expense of $49.3 million, net of foreign tax credits. We expect to fully utilize all of our federal research tax credit carryforwards generated from previous years. We have not yet completed our calculation of the total post-1986 foreign E&P for these foreign subsidiaries. This amount may change when we finalize the determination of our E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax and any additional outside basis difference inherent in these entities as these amounts continue to be indefinitely reinvested in foreign operations. We do not have the necessary information prepared or analyzed to develop a reasonable estimate of the tax liability, if any, for our remaining outside basis difference including any deferred tax accounting that may be required due to other provisions in the Act beyond the one-time transition tax, including how that accounting may be affected by our ongoing accounting position to indefinitely reinvest unremitted foreign earnings. We account for income taxes under the asset and liability method. The provision for income taxes recorded in interim periods is recorded by applying the estimated annual effective tax rate to year-to-date income before provision for income taxes, excluding the effects of significant unusual or infrequently occurring discrete items. The tax effects of discrete items are recorded in the same period that the related discrete items are reported and results in a difference between the actual effective tax rate and the estimated annual effective tax rate. The benefit for income taxes of $3.9 million and provision for income taxes of $6.3 million for the three months ended March 31, 2018 and 2017, respectively, represented estimated federal, foreign, and state income taxes. The effective tax rate for the three months ended March 31, 2018 diverged from the combined U.S. federal and state statutory tax rate primarily because of the impact of the benefit of research credits and excess share-based compensation deductions, partially offset by foreign withholding taxes, nondeductible amortization, the impact of accounting for qualified stock options, and foreign income taxed at higher tax rates. The effective tax rate for the three months ended March 31, 2017, diverged from the combined U.S. federal and state statutory tax rate, primarily because of foreign withholding taxes, nondeductible amortization, nondeductible payroll deposit penalties, and the impact of accounting for qualified stock options, partially offset by foreign income taxed at lower tax rates and research credits. The provision for income taxes of $52.6 million and $13.9 million for the nine months ended March 31, 2018, and 2017, respectively, represented estimated federal, foreign, and state income taxes. The effective tax rate for the nine months ended March 31, 2018 diverged from the combined U.S. federal and state statutory tax rate primarily because of the impact of the one-time transition tax on E&P, the impact of the reduction in the U.S. federal tax rate on our net deferred tax assets, foreign withholding taxes, nondeductible amortization, the impact of accounting for qualified stock options, and foreign income taxed at higher tax rates, partially offset by benefits from research credits. The effective tax rate for the nine months ended March 31, 2017, diverged from the combined U.S. federal and state statutory tax rate, primarily because of foreign income taxed at lower tax rates and research credits, partially offset by foreign withholding taxes, nondeductible amortization, nondeductible payroll deposit penalties, and the impact of accounting for qualified stock options. The total liability for gross unrecognized tax benefits related to uncertain tax positions increased $2.9 million during the nine months ended March 31, 2018, to $18.1 million from $15.2 million at June 30, 2017, and was included in other long-term liabilities on our condensed consolidated balance sheets. If recognized, the total gross unrecognized tax benefits would reduce the effective tax rate on income from continuing operations. Accrued interest and penalties related to unrecognized tax benefits as of March 31, 2018 were $1.4 million; this balance increased by $0.2 million compared to June 30, 2017. We classify interest and penalties as components of income tax expense. It is reasonably possible that the amount of the liability for unrecognized tax benefits may change within the next twelve months and an estimate of the range of possible changes may include an increase in our liability of up to $3.5 million. In July 2015, the U.S. Tax Court issued an opinion in Altera Corp. v. Commissioner related to a treasury regulation addressing the treatment of stock-based compensation in a cost-sharing arrangement with a related party. The U.S. Department of the Treasury has not withdrawn the requirement in its regulations related to the treatment of stock-based compensation. The Commissioner filed an appeal to the Ninth Circuit Court of Appeals in February 2016. While we determined no adjustment to our financial statements is required due to the uncertainties with respect to the ultimate resolution, we will continue to monitor developments in this case. Our major tax jurisdictions are the United States, Hong Kong SAR, and Japan. From fiscal 2010 onward, we remain subject to examination by one or more of these jurisdictions. We are currently under an income tax examination by the IRS for fiscal years 2014 and 2015, which is in the early stages. No issues have been raised during the examination so far. During the three months ended September 30, 2017, we early adopted the new ASU on Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory, which reduces the complexity in the accounting standards by allowing the recognition of current and deferred income taxes for an intra-entity asset transfer, other than inventory, when the transfer occurs. Historically, recognition of the income tax consequence of an intra-entity asset transfer was deferred and recognized either upon the disposition of the asset or over the economic life of the asset. We applied this amendment on a modified retrospective basis through a cumulative-effect adjustment of $8.3 million directly to retained earnings as of the beginning of fiscal 2018.

Segment, Customers, and Geographic Information

9 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment, Customers, and Geographic Information

13. Segment, Customers, and Geographic Information

We operate in one segment: the development, marketing, and sale of semiconductor products used in electronic devices and products. We generate our revenue from three broad product categories: the mobile product market, the personal computing, or PC, product market, and the Internet of Things product market, or IoT. We sell our products to original equipment manufacturers, or OEMs, and to contract manufacturers that provide manufacturing services to OEMs.

Net revenue within geographic areas based on our customers’ locations for the periods presented was as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
China	$	204.9	$	227.5	$	624.6	$	634.7
Japan		87.6		118.9		275.9		316.6
Taiwan		53.2		14.9		156.5		48.3
United States		14.1		50.8		79.1		172.1
South Korea		15.5		24.6		49.2		103.9
Other		18.7		7.5		56.5		16.1
	$	394.0	$	444.2	$	1,241.8	$	1,291.7

Net revenue from our customers for each group of similar products was as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Mobile product applications	$	244.8	$	369.2	$	799.5	$	1,059.8
PC product applications		60.2		53.2		187.2		171.9
IoT product applications		89.0		21.8		255.1		60.0
	$	394.0	$	444.2	$	1,241.8	$	1,291.7

As a result of our recent acquisitions, we are presenting a new revenue line for IoT. Certain reclassifications have been made to the prior year revenue presentation in the above table in order to conform to the current year revenue presentation.

Net revenue from major customers as a percentage of total net revenue for the periods presented was as follows:

	Three Months Ended		Nine Months Ended
	March 31,		March 31,
	2018	2017	2018	2017
Customer A	17%	27%	16%	24%
Customer B	11%	*	11%	*
Customer C	*	17%	*	19%
Customer D	*	10%	*	*
Customer E	11%	13%	*	10%

*Less than 10%

We extend credit based on evaluation of a customer’s financial condition, and we generally do not require collateral. Major customer accounts receivable as a percentage of total accounts receivable were as follows:

	March 31,	June 30,
	2018	2017
Customer A	16%	13%
Customer B	12%	15%
Customer C	11%	*
Customer D	10%	17%
Customer E	*	10%

*	Less than 10%

Comprehensive Income/(Loss)	9 Months Ended
Comprehensive Income/(Loss)	Mar. 31, 2018
Equity [Abstract]
Comprehensive Income/(Loss)	14. Comprehensive Income/(Loss) Our comprehensive income/(loss) generally consists of net income/(loss) plus the effect of unrealized gains and losses on our investments, primarily due to temporary changes in market value of certain of our ARS investments. In addition, we recognize the noncredit portion of other-than-temporary impairment on debt securities in other comprehensive income/(loss). We recognize foreign currency remeasurement adjustments and foreign currency transaction gains and losses in our condensed consolidated statements of operations as the U.S. dollar is the functional currency of our foreign entities.

Restructuring Activities

9 Months Ended

Mar. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring Activities

15. Restructuring Activities

In November 2017, we committed to a plan and initiated a restructuring action intended to streamline and reduce our operating cost structure and capitalize on acquisition synergies. While the total cost of this restructuring action is subject to change as we refine our plans, we currently estimate the cost to be $9.5 million to $9.9 million for fiscal 2018. Restructuring costs related to the November 2017 restructuring activities were recorded to the restructuring costs line item within our condensed consolidated statements of operations. These costs primarily related to severance costs for a reduction in headcount. The remaining restructuring charges for employee severance and benefits costs and facility consolidation and related charges are expected to be recognized before the end of fiscal 2018. The restructuring liability activities during the nine months ended March 31, 2018 were as follows (in millions):

	Employee Severance			Facility Consolidation
	and Benefits			and Related Charges			Total
Accruals	$	8.3		$	0.5		$	8.8
Cash payments		(7.0	)		-			(7.0	)
Non-cash settlements		-			(0.3	)		(0.3	)
Balance as of March 31, 2018	$	1.3		$	0.2		$	1.5

In April 2018, we committed to and initiated a restructuring to close a research and development facility. We estimate the costs to be $2.3 million to $2.7 million, and expect the activities to be substantially complete by the end of fiscal 2018. Estimated costs include employee severance and related benefits and facility closure charges.

Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, allowance for doubtful accounts, cost of revenue, inventories, loss on purchase commitments, product warranty, accrued liabilities, share-based compensation costs, provision for income taxes, deferred income tax asset valuation allowances, uncertain tax positions, goodwill, intangible assets, investments, contingent consideration liability and loss contingencies. We base our estimates on historical experience, applicable laws and regulations, and various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Foreign Currency Transactions and Foreign Exchange Contracts	Foreign Currency Transactions and Foreign Exchange Contracts The U.S. dollar is our functional and reporting currency. We remeasure our monetary assets and liabilities not denominated in the functional currency into U.S. dollar equivalents at the rate of exchange in effect on the balance sheet date. We measure and record non-monetary balance sheet accounts at the historical rate in effect at the date of transaction. We remeasure foreign currency expenses at the weighted average exchange rate in the month that the transaction occurred. Our foreign currency transactions and remeasurement gains and losses are included in selling, general, and administrative expenses in the condensed consolidated statements of operations, and resulted in net losses of $0.3 million and $0.8 million in the three and nine months ended March 31, 2018 and net losses of $0.4 million in the three and nine months ended March 31, 2017.

Net Income Per Share (Tables)

9 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Share

The computation of basic and diluted net income per share was as follows (in millions, except per share data):

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018			2017		2018			2017
Numerator:
Net income/(loss)	$	(13.7	)	$	4.5	$	(122.6	)	$	31.0
Denominator:
Shares, basic		34.5			34.8		34.0			34.9
Effect of dilutive share-based awards		-			0.6		-			0.8
Shares, diluted		34.5			35.4		34.0			35.7
Net income/(loss) per share:
Basic	$	(0.40	)	$	0.13	$	(3.61	)	$	0.89
Diluted	$	(0.40	)	$	0.13	$	(3.61	)	$	0.87

Fair Value (Tables)

9 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial Assets Measured at Fair Value on a Recurring Basis

Financial assets measured at fair value on a recurring basis by level within the fair value hierarchy, consisted of the following (in millions):

	March 31,						June 30,
	2018						2017
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets:
Money market funds	$	259.0	$	-	$	-	$	361.7	$	-	$	-
Auction rate securities		-		-		1.5		-		-		1.5
Total available-for-sale securities	$	259.0	$	-	$	1.5	$	361.7	$	-	$	1.5

Inventories (Tables)

9 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories are stated at the lower of cost (first-in, first-out method) or net realizable value and consisted of the following (in millions):

	March 31,		June 30,
	2018		2017
Raw materials and work-in-progress	$	71.4	$	94.7
Finished goods		37.1		36.7
	$	108.5	$	131.4

Acquisitions (Tables)

9 Months Ended

Mar. 31, 2018

Conexant Systems, LLC [Member]

Business Acquisition [Line Items]

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the provisional amounts recorded for the estimated fair values of the assets acquired and liabilities assumed as of the Conexant Closing Date (in millions):

Cash	$	4.3
Accounts receivable		11.7
Inventory		51.0
Other current assets		3.5
Property and equipment		3.2
Acquired intangible assets		116.9
Other assets		0.9
Total identifiable assets acquired		191.5
Accounts payable		14.2
Accrued compensation		1.3
Other accrued liabilities		9.0
Other long-term liabilities		3.0
Net identifiable assets acquired		164.0
Goodwill		182.2
Net assets acquired	$	346.2

Summary of Unaudited Pro Forma Financial Information Presents Combined Results of Operations

	Three Months Ended						Nine Months Ended
	March 31,						March 31,
	2018			2017			2018			2017
Revenue	$	394.0		$	469.1		$	1,249.9		$	1,372.0
Net income/(loss)		(13.8	)		(0.4	)		(122.4	)		19.8
Net income/(loss) per share		(0.40	)		(0.01	)		(3.60	)		0.57

Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income

Pro forma adjustments used to arrive at pro forma net income for the three and nine months ended March 31, 2018, and 2017, were as follows (in millions):

	Three Months Ended						Nine Months Ended
	March 31,						March 31,
	2018			2017			2018			2017
Buyer transaction costs	$	-		$	-		$	0.9		$	-
Interest expense		-			(4.5	)		-			(13.6	)
Intangible amortization		-			(6.1	)		(1.7	)		(16.5	)
Depreciation		(0.2	)		(0.2	)		(0.3	)		(0.7	)
Income tax adjustment		0.1			3.8			0.3			10.8
Total	$	(0.1	)	$	(7.0	)	$	(0.8	)	$	(20.0	)

Marvell Technology Group Ltd [Member]

Business Acquisition [Line Items]

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the provisional amounts recorded for the estimated fair values of the assets acquired and liabilities assumed as of the Marvell Business Acquisition date (in millions):

Inventory	$	28.4
Property and equipment		5.0
Acquired intangible assets		45.7
Total identifiable assets acquired		79.1
Accrued liabilities		0.7
Net identifiable assets acquired		78.4
Goodwill		15.3
Net assets acquired	$	93.7

Summary of Unaudited Pro Forma Financial Information Presents Combined Results of Operations

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018			2017		2018			2017
Revenue	$	394.0		$	469.1	$	1,345.2		$	1,367.1
Net income/(loss)		(13.7	)		15.0		(121.3	)		19.8
Net income/(loss) per share		(0.40	)		0.45		(3.57	)		0.58

Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income

Pro forma adjustments used to arrive at pro forma net loss for the three and nine months ended March 31, 2018 and 2017, were as follows (in millions):

	Three Months Ended					Nine Months Ended
	March 31,					March 31,
	2018		2017			2018			2017
Buyer transaction costs	$	-	$	-		$	1.1		$	-
Interest expense		-		(4.9	)		-			(14.7	)
Intangible amortization		-		(5.6	)		(1.2	)		(7.3	)
Income tax adjustment		-		3.7			-			7.7
Total	$	-	$	(6.8	)	$	(0.1	)	$	(14.3	)

Acquired Intangibles and Goodwill (Tables)

9 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Life, Gross Carrying Value and Related Accumulated Amortization of Acquired Intangible Assets

The following table summarizes the life, the gross carrying value and the related accumulated amortization of our acquired intangible assets as of March 31, 2018 and June 30, 2017 (in millions):

	Weighted Average Life in Years		March 31, 2018			June 30, 2017
Display driver technology		5.3	$	164.0		$	164.0
Audio and video technology		4.7		118.2			-
Customer relationships		3.6		66.2			48.4
Fingerprint authentication technology		4.0		55.7			63.5
Licensed technology and other		4.3		9.0			1.3
Tradename		7.0		1.7			-
Patents		7.7		4.6			4.8
Backlog		0.5		1.3			-
In-process research and development	Not applicable			3.6			-
Acquired intangibles, gross		4.6		424.3			282.0
Accumulated amortization				(214.9	)		(181.0	)
Acquired intangibles, net			$	209.4		$	101.0

Schedule of Expected Annual Aggregate Amortization Expense

The following table presents expected annual fiscal year aggregate amortization expense as of March 31, 2018 (in millions):

Remainder of 2018	$	20.9
2019		71.7
2020		48.2
2021		35.3
2022		25.8
2023		3.2
Thereafter		0.7
To be determined		3.6
Future amortization	$	209.4

Schedule of Changes in Goodwill

Beginning balance	$	206.8
Acquisition activity		157.3
Post-acquisition adjustments		40.1
Ending balance	$	404.2

Other Accrued Liabilities (Tables)

9 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Other Accrued Liabilities

Other accrued liabilities consisted of the following (in millions):

	March 31,		June 30,
	2018		2017
Customer obligations	$	30.9	$	34.8
Inventory obligations		27.0		41.8
Warranty		6.5		4.4
Other		26.8		20.8
	$	91.2	$	101.8

Debt (Tables)

9 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Contractual Interest Expense and Amortization of Discount on Notes

The contractual interest expense and amortization of discount on the Notes for the nine months ended March 31, 2018, were as follows (in millions):

	Nine Months Ended
	March 31,
	2018
Interest expense	$	2.0
Amortization of discount and debt issuance costs		12.7
Total interest	$	14.7

Share-Based Compensation (Tables)

9 Months Ended

Mar. 31, 2018

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Share-Based Compensation and Related Tax Benefit Recognized in Condensed Consolidated Statements of Income

Share-based compensation and the related tax benefit recognized in our condensed consolidated statements of operations were as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Cost of revenue	$	0.9	$	0.6	$	2.3	$	1.7
Research and development		10.0		8.7		28.9		25.0
Selling, general, and administrative		7.9		6.8		21.9		19.6
Total	$	18.8	$	16.1	$	53.1	$	46.3
Income tax benefit on share-based compensation	$	3.4	$	4.1	$	6.1	$	12.1

Balance of Outstanding and Exercisable Stock Options

	Stock			Weighted		Aggregate
	Option			Average		Intrinsic
	Awards			Exercise		Value
	Outstanding			Price		(in millions)
Balance as of June 30, 2017		2,490,168		$	49.20
Granted		61,825			45.32
Exercised		(359,541	)		22.87
Forfeited		(180,812	)		64.39
Balance as of March 31, 2018		2,011,640			52.42	$	13.3
Exercisable at March 31, 2018		1,702,535			51.07	$	13.3

Shares Purchased, Weighted Average Purchase Price, Cash Received, and Aggregate Intrinsic Value for ESPP

Shares purchased		210,798
Weighted average purchase price	$	32.17
Cash received	$	6.8
Aggregate intrinsic value	$	1.2

Deferred stock units outstanding [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Balance and Aggregate Intrinsic Value of Stock Units

DSU activity, including DSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of DSUs were as follows:

				Aggregate
	DSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2017		1,320,798
Granted		1,291,303
Delivered		(480,778	)
Forfeited		(205,364	)
Balance as of March 31, 2018		1,925,959		$	88.1

Market stock units outstanding [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Balance and Aggregate Intrinsic Value of Stock Units

During the nine months ended March 31, 2018, MSU activity, including MSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of MSUs as of March 31, 2018 was as follows:

				Aggregate
	MSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2017		158,596
Granted		300,071
Performance adjustment		(68,003	)
Delivered		-
Forfeited		(35,938	)
Balance as of March 31, 2018		354,726		$	16.2

Segment, Customers, and Geographic Information (Tables)

9 Months Ended

Mar. 31, 2018

Net Revenue within Geographic Areas Based on Customers' Locations

Net revenue within geographic areas based on our customers’ locations for the periods presented was as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
China	$	204.9	$	227.5	$	624.6	$	634.7
Japan		87.6		118.9		275.9		316.6
Taiwan		53.2		14.9		156.5		48.3
United States		14.1		50.8		79.1		172.1
South Korea		15.5		24.6		49.2		103.9
Other		18.7		7.5		56.5		16.1
	$	394.0	$	444.2	$	1,241.8	$	1,291.7

Net Revenue from External Customers

Net revenue from our customers for each group of similar products was as follows (in millions):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Mobile product applications	$	244.8	$	369.2	$	799.5	$	1,059.8
PC product applications		60.2		53.2		187.2		171.9
IoT product applications		89.0		21.8		255.1		60.0
	$	394.0	$	444.2	$	1,241.8	$	1,291.7

Sales Revenue, Net [Member]

Major Customers as Percentage of Net Revenue

Net revenue from major customers as a percentage of total net revenue for the periods presented was as follows:

	Three Months Ended		Nine Months Ended
	March 31,		March 31,
	2018	2017	2018	2017
Customer A	17%	27%	16%	24%
Customer B	11%	*	11%	*
Customer C	*	17%	*	19%
Customer D	*	10%	*	*
Customer E	11%	13%	*	10%

*Less than 10%

Accounts Receivable [Member]

Major Customers as Percentage of Net Revenue

Major customer accounts receivable as a percentage of total accounts receivable were as follows:

	March 31,	June 30,
	2018	2017
Customer A	16%	13%
Customer B	12%	15%
Customer C	11%	*
Customer D	10%	17%
Customer E	*	10%

*	Less than 10%

Restructuring Activities (Tables)

9 Months Ended

Mar. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring Liability Activities

The restructuring liability activities during the nine months ended March 31, 2018 were as follows (in millions):

	Employee Severance			Facility Consolidation
	and Benefits			and Related Charges			Total
Accruals	$	8.3		$	0.5		$	8.8
Cash payments		(7.0	)		-			(7.0	)
Non-cash settlements		-			(0.3	)		(0.3	)
Balance as of March 31, 2018	$	1.3		$	0.2		$	1.5

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Net gain (loss) on foreign currency transactions	$ (0.3)	$ (0.4)	$ (0.8)	$ (0.4)

Revenue Recognition - Additional Information (Detail)	9 Months Ended
Revenue Recognition - Additional Information (Detail)	Mar. 31, 2018 Time
Maximum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Stock rotation rights of inventory per year for distributors	2

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income/(loss)	$ (13.7)	$ 4.5	$ (122.6)	$ 31.0
Denominator:
Shares, basic	34.5	34.8	34.0	34.9
Effect of dilutive share-based awards		0.6		0.8
Shares, diluted	34.5	35.4	34.0	35.7
Net income/(loss) per share:
Basic	$ (0.40)	$ 0.13	$ (3.61)	$ 0.89
Diluted	$ (0.40)	$ 0.13	$ (3.61)	$ 0.87

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-Based Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares that were not included in computation of diluted net income per share	2,818,358	2,380,552	2,427,566	1,739,783

Fair Value - Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 259.0	$ 361.7
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	1.5	1.5
Money Market Funds [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	259.0	361.7
Auction Rate Securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 1.5	$ 1.5

Fair Value - Additional Information (Detail) - USD ($)	9 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Changes in fair value of level 3 financial assets	$ 0
Transfer amount of assets of level one	0	$ 0
Transfer amount of assets of level two	0	0
Transfer amount of assets of level three	0	0
Transfer amount of assets out of level three	$ 0	$ 0

Inventories - Inventories (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Inventory Disclosure [Abstract]
Raw materials and work-in-progress	$ 71.4	$ 94.7
Finished goods	37.1	36.7
Total Inventories	$ 108.5	$ 131.4

Acquisitions - Additional Information (Detail) - USD ($) $ in Millions				3 Months Ended		6 Months Ended	7 Months Ended	8 Months Ended	9 Months Ended
	Sep. 08, 2017	Jul. 25, 2017	Jun. 11, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 30, 2017	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Acquired intangible assets amortize over an estimated weighted average useful life									4 years 7 months 6 days
Operating income/(loss)				$ (12.3)	$ 12.3				$ (53.2)	$ 46.7
Decrease in amortization of intangible assets				(18.7)	(14.0)				(62.0)	(45.2)
Net revenue				394.0	444.2				1,241.8	1,291.7
Cost of Revenue [Member]
Business Acquisition [Line Items]
Decrease in amortization of intangible assets				(17.2)	$ (11.7)				$ (53.4)	$ (35.9)
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets amortize over an estimated weighted average useful life									3 years 7 months 6 days
Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets amortize over an estimated weighted average useful life									6 months
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Acquired intangible assets		$ 116.9
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member]
Business Acquisition [Line Items]
Acquisition agreement date			Jun. 11, 2017
Acquisition closing effective date		Jul. 25, 2017
Purchase price of acquisition		$ 305.4
Issuance of common stock for acquisition, shares		726,666
Issuance of common stock for acquisition, value		$ 39.1
Business acquisition stock appreciation rights liability		3.5
Purchase price held in escrow		16.8
Business combination purchase price adjustment		1.8
Business combination, consideration transferred		346.2
Acquired intangible assets				116.9		$ 152.5	$ 116.9	$ 116.9	$ 116.9		$ 152.5
Operating income/(loss)						$ 2.2		(34.7)
Net revenue								87.8
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Cost of Revenue [Member]
Business Acquisition [Line Items]
Decrease in amortization of intangible assets				0.9
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Operating Expense [Member]
Business Acquisition [Line Items]
Decrease in amortization of intangible assets				1.3
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Goodwill [Member]
Business Acquisition [Line Items]
Reduction to the intangible assets									$ 35.6
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Identified intangible assets included discount rates									12.00%
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Identified intangible assets included discount rates									8.00%
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Developed Technology [Member]
Business Acquisition [Line Items]
Acquired intangible assets				93.2			93.2	93.2	$ 93.2
Acquired intangible assets amortize over an estimated weighted average useful life									5 years
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets				21.7			21.7	21.7	$ 21.7
Acquired intangible assets amortize over an estimated weighted average useful life									4 years
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Trademarks [Member]
Business Acquisition [Line Items]
Acquired intangible assets				1.7			1.7	1.7	$ 1.7
Acquired intangible assets amortize over an estimated weighted average useful life									7 years
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets				$ 0.3			0.3	$ 0.3	$ 0.3
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Backlog [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets amortize over an estimated weighted average useful life									1 year
Conexant Systems, LLC [Member] \| Securities Purchase Agreement [Member] \| Escrow Obligations Under Purchase Agreement [Member]
Business Acquisition [Line Items]
Purchase price held in escrow		$ 7.0
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 45.7
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member]
Business Acquisition [Line Items]
Acquisition agreement date			Jun. 11, 2017
Acquisition closing effective date	Sep. 08, 2017
Purchase price of acquisition	$ 93.7
Acquired intangible assets	$ 45.7
Operating income/(loss)							(12.7)
Net revenue							$ 98.1
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Identified intangible assets included discount rates	19.00%
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Identified intangible assets included discount rates	9.00%
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Developed Technology [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 24.9
Acquired intangible assets amortize over an estimated weighted average useful life	4 years
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 16.2
Acquired intangible assets amortize over an estimated weighted average useful life	4 years
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 1.0
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| Backlog [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets amortize over an estimated weighted average useful life	1 year
Marvell Technology Group Ltd [Member] \| Asset Purchase Agreement [Member] \| In-Process Research and Development [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 3.6

Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 08, 2017	Jul. 25, 2017	Jun. 30, 2017	Jun. 24, 2017
Business Acquisition [Line Items]
Goodwill	$ 404.2			$ 206.8	$ 206.8
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Cash			$ 4.3
Accounts receivable			11.7
Inventory			51.0
Other current assets			3.5
Property and equipment			3.2
Acquired intangible assets			116.9
Other assets			0.9
Total identifiable assets acquired			191.5
Accounts payable			14.2
Accrued compensation			1.3
Other accrued liabilities			9.0
Other long-term liabilities			3.0
Net identifiable assets acquired			164.0
Goodwill			182.2
Net assets acquired			$ 346.2
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Inventory		$ 28.4
Property and equipment		5.0
Acquired intangible assets		45.7
Total identifiable assets acquired		79.1
Accrued liabilities		0.7
Net identifiable assets acquired		78.4
Goodwill		15.3
Net assets acquired		$ 93.7

Acquisitions - Summary of Unaudited Pro Forma Financial Information Presents Combined Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Revenue	$ 394.0	$ 469.1	$ 1,249.9	$ 1,372.0
Net income/(loss)	$ (13.8)	$ (0.4)	$ (122.4)	$ 19.8
Net income/(loss) per share	$ (0.40)	$ (0.01)	$ (3.60)	$ 0.57
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Revenue	$ 394.0	$ 469.1	$ 1,345.2	$ 1,367.1
Net income/(loss)	$ (13.7)	$ 15.0	$ (121.3)	$ 19.8
Net income/(loss) per share	$ (0.40)	$ 0.45	$ (3.57)	$ 0.58

Acquisitions - Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Buyer transaction costs			$ 0.9
Interest expense		$ (4.5)		$ (13.6)
Intangible amortization		(6.1)	(1.7)	(16.5)
Depreciation	$ (0.2)	(0.2)	(0.3)	(0.7)
Income tax adjustment	0.1	3.8	0.3	10.8
Total	$ (0.1)	(7.0)	(0.8)	(20.0)
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Buyer transaction costs			1.1
Interest expense		(4.9)		(14.7)
Intangible amortization		(5.6)	(1.2)	(7.3)
Income tax adjustment		3.7		7.7
Total		$ (6.8)	$ (0.1)	$ (14.3)

Acquired Intangibles and Goodwill - Summary of Life, Gross Carrying Value and Related Accumulated Amortization of Acquired Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 424.3	$ 282.0
Accumulated amortization	(214.9)	(181.0)
Acquired intangibles, net	$ 209.4	101.0
Weighted Average Life in Years	4 years 7 months 6 days
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 164.0	164.0
Weighted Average Life in Years	5 years 3 months 18 days
Audio and Video Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 118.2
Weighted Average Life in Years	4 years 8 months 12 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 66.2	48.4
Weighted Average Life in Years	3 years 7 months 6 days
Fingerprint Authentication Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 55.7	63.5
Weighted Average Life in Years	4 years
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 9.0	1.3
Weighted Average Life in Years	4 years 3 months 19 days
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 1.7
Weighted Average Life in Years	7 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 4.6	$ 4.8
Weighted Average Life in Years	7 years 8 months 12 days
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 1.3
Weighted Average Life in Years	6 months
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, gross	$ 3.6

Acquired Intangibles and Goodwill - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles amortization	$ 18.7	$ 14.0	$ 62.0	$ 45.2
Cost of Revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles amortization	$ 17.2	$ 11.7	$ 53.4	$ 35.9

Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 20.9
2019	71.7
2020	48.2
2021	35.3
2022	25.8
2023	3.2
Thereafter	0.7
To be determined	3.6
Acquired intangibles, net	$ 209.4	$ 101.0

Acquired Intangibles and Goodwill - Schedule of Changes in Goodwill (Detail) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 206.8
Acquisition activity	157.3
Post-acquisition adjustments	40.1
Ending balance	$ 404.2

Other Accrued Liabilities - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Payables And Accruals [Abstract]
Customer obligations	$ 30.9	$ 34.8
Inventory obligations	27.0	41.8
Warranty	6.5	4.4
Other	26.8	20.8
Other accrued liabilities	$ 91.2	$ 101.8

Indemnifications, Contingencies and Legal Proceedings - Additional Information (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Contingent consideration liabilities recorded for business combinations	$ 8.7

Debt - Additional Information (Detail)			9 Months Ended
Debt - Additional Information (Detail)	Jun. 26, 2017 USD ($) shares	Jun. 20, 2017 USD ($) Day $ / shares shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jun. 30, 2017 shares	Jun. 24, 2017 USD ($)
Debt Instrument [Line Items]
Number of shares of common stock repurchase \| shares			27,639,876				25,941,476
Remaining debt issuance costs expensed			$ 1,500,000	$ 800,000
Debt issuance cost			$ 1,100,000
Percentage of voting capital stock			65.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding principal amount								$ 100,000,000
0.50% Convertible Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument aggregate principal amount			$ 525,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Outstanding principal amount								220,000,000
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility amount						$ 250,000,000		450,000,000
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt amortization period			60 months
Outstanding principal amount			$ 0
Line of credit facility amount					$ 200,000,000
Line of credit facility allowable requests for additional borrowing					100,000,000
Maturity period			Sep. 27, 2022
Repayment date, description			The revolving credit facility is required to be repaid in full on the earlier of (i) September 27, 2022 and (ii) the date 91 days prior to the Maturity Date of the Notes if the Notes have not been refinanced in full by such date.
Debt issuance cost			$ 2,300,000
Description of base rate			The revolving credit facility bears interest at our election of a Base Rate plus an Applicable Margin or LIBOR plus an Applicable Margin. Swingline loans bear interest at a Base Rate plus an Applicable Margin. The Base Rate is a floating rate that is the greater of the Prime Rate, the Federal Funds Rate plus 50 basis points, or LIBOR plus 100 basis points. The Applicable Margin is based on a sliding scale which ranges from 0.25 to 100 basis points for Base Rate loans and 100 basis points to 175 basis points for LIBOR loans.
Covenant description			Under the Agreement, there are various restrictive covenants, including three financial covenants which limit the consolidated total leverage ratio, or leverage ratio, the consolidated interest coverage ratio, or interest coverage ratio, a restriction which places a limit on the amount of capital expenditures that may be made in any fiscal year, a restriction that permits up to $50 million per fiscal quarter of accounts receivable financings, and sets the Specified Leverage Ratio. The leverage ratio is the ratio of debt as of the measurement date to earnings before interest, taxes, depreciation and amortization, or EBITDA, for the four consecutive quarters ending with the quarter of measurement. The current leverage ratio shall not exceed 3.50 to 1.00 provided that for the four fiscal quarters ending after the date of a material acquisition, such maximum leverage ratio shall be adjusted to 3.75 to 1.00, and thereafter, shall not be more than 3.50 to 1.00. The interest coverage ratio is EBITDA to interest expense for the four consecutive quarters ending with the quarter of measurement. The interest coverage ratio must not be less than 3.50 to 1.0 during the term of the Agreement. The Specified Leverage Ratio is the ratio used in determining, among other things, whether we are permitted to make dividends and/or prepay certain indebtedness, at a fixed ratio of 3.00 to 1.00. As of the end of the quarter, we were in compliance with the restrictive covenants.
Maximum accounts receivable financings per quarter			$ 50,000,000
Maximum leverage ratio permitted			3.50%
Minimum interest coverage ratio			3.50%
Fixed coverage ratio			3.00%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| For The First Four Fiscal Quarters Ending After Date of Material Acquisition [Member]
Debt Instrument [Line Items]
Maximum leverage ratio permitted			3.75%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Thereafter [Member]
Debt Instrument [Line Items]
Maximum leverage ratio permitted			3.50%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Federal Funds Rates [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage of unused portion			0.175%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.0025%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage of unused portion			0.25%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Amendment and Restatement Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility amount					20,000,000
Amendment and Restatement Agreement [Member] \| Bridge Loan [Member]
Debt Instrument [Line Items]
Line of credit facility amount					$ 20,000,000
Purchase Agreement [Member] \| 0.50% Convertible Senior Notes due 2022 [Member] \| Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Debt instrument aggregate principal amount		$ 500,000,000
Debt instrument additional aggregate principal amount		$ 25,000,000
Option to purchase additional principal amount of notes granted to initial purchasers, period		30 days
Net proceeds from issuance of convertible debt	$ 514,500,000
Number of shares of common stock repurchase \| shares	1,698,400
Interest rates on borrowings		0.50%
Debt instrument maturity date			Jun. 15, 2022
Conversion of notes in multiples of principal amounts		$ 1,000
Convertible number of shares, principal amount of notes \| shares		13.6947
Initial conversion price per share of common stock \| $ / shares		$ 73.02
Note repurchase price, percentage of principal amount of notes		100.00%
Sale price of common stock, minimum threshold percentage		130.00%
Sale of common stock, threshold trading days \| Day		20
Sale of common stock, threshold consecutive trading days \| Day		30
Equity component of the principal amount of the convertible debt		$ 82,100,000
Nonconvertible debt borrowing rate		4.39%
Debt instrument term		5 years
Debt issuance costs		$ 11,100,000
Initial purchaser’s discount		10,500,000
Legal, accounting, and printing costs		579,000
Convertible debt issuance costs pro rata to equity components		1,900,000
Convertible debt issuance costs pro rata to debt components		$ 9,200,000
Debt amortization period		5 years
Unamortized amounts of debt issuance costs			$ 7,900,000
Unamortized amounts of debt discount			70,700,000
Term Loan Arrangement [Member]
Debt Instrument [Line Items]
Outstanding principal amount								$ 120,000,000
Term Loan Arrangement [Member] \| Amendment and Restatement Agreement [Member]
Debt Instrument [Line Items]
Remaining debt issuance costs expensed			$ 1,000,000

Debt - Schedule of Contractual Interest Expense and Amortization of Discount on Notes (Detail) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Amortization of discount and debt issuance costs	$ 12.7
Purchase Agreement [Member] \| 0.50% Convertible Senior Notes due 2022 [Member] \| Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Interest expense	2.0
Amortization of discount and debt issuance costs	12.7
Total interest	$ 14.7

Share-Based Compensation - Additional Information (Detail) - ASU for Compensation-Stock Compensation [Member] $ in Millions	Sep. 30, 2017 USD ($)
Retained Earnings [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	$ 24.7
Additional Paid-in Capital [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	1.0
Deferred Tax Assets for Research Credit and Alternative Minimum Tax Credit Carryforwards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	$ 25.7

Share-Based Compensation - Share-Based Compensation and Related Tax Benefit Recognized in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 18.8	$ 16.1	$ 53.1	$ 46.3
Income tax benefit on share-based compensation	3.4	4.1	6.1	12.1
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	0.9	0.6	2.3	1.7
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	10.0	8.7	28.9	25.0
Selling, General, and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 7.9	$ 6.8	$ 21.9	$ 19.6

Stock Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Awards Outstanding, Balance as of June 30, 2017 \| shares	2,490,168
Stock Option Awards Outstanding, Granted \| shares	61,825
Stock Option Awards Outstanding, Exercised \| shares	(359,541)
Stock Option Awards Outstanding, Forfeited \| shares	(180,812)
Stock Option Awards Outstanding, Balance as of March 31, 2018 \| shares	2,011,640
Stock Option Awards Outstanding, Exercisable at March 31, 2018 \| shares	1,702,535
Weighted Average Exercise Price, Balance as of June 30, 2017 \| $ / shares	$ 49.20
Weighted Average Exercise Price, Granted \| $ / shares	45.32
Weighted Average Exercise Price, Exercised \| $ / shares	22.87
Weighted Average Exercise Price, Forfeited \| $ / shares	64.39
Weighted Average Exercise Price, Balance as of March 31, 2018 \| $ / shares	52.42
Weighted Average Exercise Price, Exercisable at March 31, 2018 \| $ / shares	$ 51.07
Aggregate Intrinsic Value, Balance as of March 31, 2018 \| $	$ 13.3
Aggregate Intrinsic Value, Exercisable at March 31, 2018 \| $	$ 13.3

Share-Based Compensation - Stock Options - Additional Information (Detail)	Mar. 29, 2018 $ / shares
Stock option outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of common stock used to calculate Aggregate intrinsic value of stock option outstanding	$ 45.73

Share-Based Compensation - Balance and Aggregate Intrinsic Value of Stock Units (Detail) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($) shares
Deferred stock units outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Unit Awards Outstanding, Balance as of June 30, 2017	1,320,798
Stock Unit Awards, Granted	1,291,303
Stock Unit Awards, Delivered	(480,778)
Stock Unit Awards, Forfeited	(205,364)
Stock Unit Awards Outstanding, Balance as of March 31, 2018	1,925,959
Aggregate Intrinsic Value, Balance as of March 31, 2018 \| $	$ 88.1
Market stock units outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Unit Awards Outstanding, Balance as of June 30, 2017	158,596
Stock Unit Awards, Granted	300,071
Stock Unit Awards, Performance adjustment	(68,003)
Stock Unit Awards, Forfeited	(35,938)
Stock Unit Awards Outstanding, Balance as of March 31, 2018	354,726
Aggregate Intrinsic Value, Balance as of March 31, 2018 \| $	$ 16.2

Share-Based Compensation - Deferred Stock Units - Additional Information (Detail) - Deferred stock units outstanding [Member] - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Mar. 31, 2018	Mar. 29, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of common stock used to calculate Aggregate intrinsic value of stock option outstanding		$ 45.73
Shares withheld to meet statutory tax withholding requirements	123,583
Shares valued withheld to meet statutory tax withholding requirements	$ 4.8

Share-Based Compensation - Market Stock Units - Additional Information (Detail) - Market stock units outstanding [Member] $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout adjustment ratio	200.00%
Unrecognized share-based compensation cost	$ 16.9
Unrecognized share-based compensation, period for recognition	1 year 4 months 24 days
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	0.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	200.00%
Share-based Compensation Award, First Tranche [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the underlying awards	1 year
Vesting percentage of the underlying awards	33.33%
Share-based Compensation Award, First Tranche [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	100.00%
Share-based Compensation Award, Second Tranche [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the underlying awards	2 years
Vesting percentage of the underlying awards	33.33%
Share-based Compensation Award, Second Tranche [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	100.00%
Share-based Compensation Award, Third Tranche [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the underlying awards	3 years
Vesting percentage of the underlying awards	33.33%

Share-Based Compensation - Performance Stock Units - Additional Information (Detail) - Performance stock units outstanding [Member] $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the underlying awards	3 years
Vesting percentage of the underlying awards	33.33%
Stock units, granted	315,380
Stock units, delivered	0
Stock units, forfeited	20,839
Aggregate intrinsic value \| $	$ 13.5
Requisite service period	3 years
Unrecognized share-based compensation cost \| $	$ 9.4
Unrecognized share-based compensation, period for recognition	1 year 8 months 12 days
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	0.00%
Threshold percentage of earnings per share to trigger pay out	65.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout range	200.00%
Threshold percentage of earnings per share to trigger pay out	135.00%

Share-Based Compensation - Shares Purchased, Weighted Average Purchase Price, Cash Received, and Aggregate Intrinsic Value for ESPP (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value	$ 13.3
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares purchased \| shares	210,798
Weighted average purchase price \| $ / shares	$ 32.17
Cash received	$ 6.8
Aggregate intrinsic value	$ 1.2

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Line Items]
U.S. federal corporate tax rate				35.00%
Provisional tax expense				$ 46.2
Discrete tax expense				54.4
Non-discrete tax benefit				$ (8.2)
Impact of annual effective tax rate				10.60%
Discrete tax provision	$ 5.1			$ 5.1
Increase in income tax expense, net of foreign tax credits				49.3
Provision/(benefit) for income taxes	(3.9)	$ 6.3		52.6	$ 13.9
Gross unrecognized tax benefits	18.1			18.1				$ 15.2
Gross unrecognized tax benefits increased during the year				2.9
Interest and penalties accrued related to unrecognized tax benefits	1.4			1.4
Increase in interest and penalties accrued related to unrecognized tax benefits				0.2
Cumulative-effect adjustment related to retained earnings, tax				8.3
Maximum [Member]
Income Tax Disclosure [Line Items]
Estimated increase in unrecognized tax benefit in next twelve months	$ 3.5			3.5
Undistributed Foreign Earnings [Member]
Income Tax Disclosure [Line Items]
Provision/(benefit) for income taxes				$ 0.0
Cash Assets [Member]
Income Tax Disclosure [Line Items]
One-time transition tax rate on post-1986 foreign earnings and profits	15.50%			15.50%
Other Specified Assets [Member]
Income Tax Disclosure [Line Items]
One-time transition tax rate on post-1986 foreign earnings and profits	8.00%			8.00%
Scenario, Forecast [Member]
Income Tax Disclosure [Line Items]
U.S. federal corporate tax rate			21.00%			21.00%	28.17%

Segment, Customers, and Geographic Information - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2018 Segment Product
Segment Reporting [Abstract]
Number of operating segments \| Segment	1
Number of product \| Product	3

Segment, Customers, and Geographic Information - Net Revenue within Geographic Areas Based on Customers' Locations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 394.0	$ 444.2	$ 1,241.8	$ 1,291.7
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	204.9	227.5	624.6	634.7
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	87.6	118.9	275.9	316.6
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	53.2	14.9	156.5	48.3
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	14.1	50.8	79.1	172.1
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	18.7	7.5	56.5	16.1
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 15.5	$ 24.6	$ 49.2	$ 103.9

Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Net revenue	$ 394.0	$ 444.2	$ 1,241.8	$ 1,291.7
Mobile Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	244.8	369.2	799.5	1,059.8
PC Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	60.2	53.2	187.2	171.9
Internet of Things Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	$ 89.0	$ 21.8	$ 255.1	$ 60.0

Segment, Customers, and Geographic Information - Major Customers as Percentage of Net Revenue (Detail) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	17.00%	27.00%	16.00%	24.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%		11.00%
Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		17.00%		19.00%
Customer D [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		10.00%
Customer E [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%	13.00%		10.00%

Segment, Customers, and Geographic Information - Major Customers as Percentage of Net Revenue (Parenthetical) (Detail)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Maximum [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%	10.00%

Segment, Customers, and Geographic Information - Major Customer Accounts Receivable as Percentage of Accounts Receivable (Detail) - Accounts Receivable [Member] - Credit Concentration Risk [Member]	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 24, 2017
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	16.00%	13.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	12.00%	15.00%
Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%
Customer D [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	17.00%
Customer E [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		10.00%

Segment, Customers, and Geographic Information - Major Customer Accounts Receivable as Percentage of Accounts Receivable (Parenthetical) (Detail)	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 24, 2017
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Maximum [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	10.00%

Restructuring Activities - Additional Information (Detail) - USD ($) $ in Millions	Apr. 30, 2018	Nov. 30, 2017
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for fiscal 2018		$ 9.5
Minimum [Member] \| Subsequent Event [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for fiscal 2018	$ 2.3
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for fiscal 2018		$ 9.9
Maximum [Member] \| Subsequent Event [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for fiscal 2018	$ 2.7

Restructuring Activities - Restructuring Liability Activities (Detail) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Accruals	$ 8.8
Cash payments	(7.0)
Non-cash settlements	(0.3)
Balance as of March 31, 2018	1.5
Employee Severance and Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Accruals	8.3
Cash payments	(7.0)
Balance as of March 31, 2018	1.3
Facility Consolidation and Related Charges [Member]
Restructuring Cost And Reserve [Line Items]
Accruals	0.5
Non-cash settlements	(0.3)
Balance as of March 31, 2018	$ 0.2