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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Sep. 29, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 29, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	SYNA
Entity Registrant Name	SYNAPTICS INCORPORATED
Entity Central Index Key	0000817720
Current Fiscal Year End Date	--06-29
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		34,618,700

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Current Assets:
Cash and cash equivalents	$ 263.3	$ 301.0
Accounts receivable, net of allowances of $2.0 and $1.8 at September 30, 2018 and June 30, 2018, respectively	332.6	289.1
Inventories	161.2	131.2
Prepaid expenses and other current assets	31.9	18.2
Total current assets	789.0	739.5
Property and equipment at cost, net of accumulated depreciation of $129.5 and $127.4 at September 30, 2018 and June 30, 2018, respectively	110.9	117.8
Goodwill	372.8	372.8
Acquired intangibles, net	199.2	219.2
Non-current other assets	52.9	50.5
Total assets	1,524.8	1,499.8
Current Liabilities:
Accounts payable	175.4	156.9
Accrued compensation	23.8	25.4
Income taxes payable	18.7	13.1
Acquisition-related liabilities	6.8	8.7
Other accrued liabilities	101.0	79.7
Total current liabilities	325.7	283.8
Convertible notes, net	455.1	450.7
Other long-term liabilities	33.9	36.0
Total liabilities	814.7	770.5
Stockholders' Equity:
$0.001 par value; 120,000,000 shares authorized, 63,030,058 and 62,889,679 shares issued, and 34,527,728 and 35,249,803 shares outstanding, at September 30, 2018 and June 30, 2018, respectively	0.1	0.1
Additional paid-in capital	1,213.1	1,195.2
Treasury stock: 28,502,330 and 27,639,876 common treasury shares at September 30, 2018 and June 30, 2018, respectively, at cost	(1,113.3)	(1,073.9)
Accumulated other comprehensive income		1.5
Retained earnings	610.2	606.4
Total stockholders' equity	710.1	729.3
Liabilities and stockholders' equity	$ 1,524.8	$ 1,499.8

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 2.0	$ 1.8
Property and equipment, accumulated depreciation	$ 129.5	$ 127.4
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	63,030,058	62,889,679
Common stock, shares outstanding	34,527,728	35,249,803
Common treasury shares	28,502,330	27,639,876

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net revenue	$ 417.6	$ 417.4
Cost of revenue	276.7	303.0
Gross margin	140.9	114.4
Operating expenses:
Research and development	90.0	87.1
Selling, general, and administrative	33.9	40.3
Acquired intangibles amortization	2.9	4.1
Restructuring costs	8.3	(0.2)
Total operating expenses	135.1	131.3
Operating income/(loss)	5.8	(16.9)
Interest and other expense, net	(1.9)	(6.0)
Income/(loss) before provision/(benefit) for income taxes and equity investment loss	3.9	(22.9)
Provision/(benefit) for income taxes	(0.3)	3.2
Equity investment loss	(0.4)	(0.4)
Net income/(loss)	$ 3.8	$ (26.5)
Net income/(loss) per share:
Basic	$ 0.11	$ (0.79)
Diluted	$ 0.11	$ (0.79)
Shares used in computing net income/(loss) per share:
Basic	35.1	33.5
Diluted	36.1	33.5

Condensed Consolidated Statements of Comprehensive Income/ (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income/(loss)	$ 3.8	$ (26.5)
Other comprehensive loss:
Change in unrealized net gain on investment	(1.5)
Net current period-other comprehensive loss	(1.5)
Comprehensive income/(loss)	$ 2.3	$ (26.5)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income/(loss)	$ 3.8	$ (26.5)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Share-based compensation costs	16.7	16.5
Depreciation and amortization	10.0	11.3
Acquired intangibles amortization	20.0	20.1
Deferred taxes	(5.6)	(7.3)
Amortization of convertible debt discount and issuance costs	4.4	4.3
Amortization of debt issuance costs	0.1	1.3
Impairment recovery on investments	(2.8)
Arbitration settlement	(1.9)
Equity investment loss	0.4	0.4
Foreign currency remeasurement (gain)/loss	0.1	(0.4)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(38.3)	13.2
Inventories	(30.0)	31.8
Prepaid expenses and other current assets	(13.8)	22.0
Other assets	1.1	(0.1)
Accounts payable	22.3	(28.8)
Accrued compensation	(1.6)	(13.5)
Income taxes payable	3.7	0.5
Other accrued liabilities	16.0	(5.0)
Net cash provided by operating activities	4.6	39.8
Cash flows from investing activities
Acquisition of businesses, net of cash and cash equivalents acquired		(396.8)
Proceeds from sales of investments	2.8
Purchases of property and equipment	(6.8)	(11.4)
Net cash used in investing activities	(4.0)	(408.2)
Cash flows from financing activities
Proceeds from issuance of convertible debt, net of issuance costs		514.5
Payment of debt		(220.0)
Purchases of treasury stock	(39.4)	(93.6)
Proceeds from issuance of shares	2.1	1.1
Payment of debt issuance costs		(1.1)
Payroll taxes for deferred stock and market stock units	(0.9)	(0.5)
Net cash provided by/(used in) financing activities	(38.2)	200.4
Effect of exchange rate changes on cash and cash equivalents	(0.1)	(0.1)
Net decrease in cash and cash equivalents	(37.7)	(168.1)
Cash and cash equivalents at beginning of period	301.0	367.8
Cash and cash equivalents at end of period	263.3	199.7
Supplemental disclosures of cash flow information
Cash paid for taxes	1.7	11.4
Non-cash investing and financing activities:
Purchases of property and equipment in current liabilities	$ 2.9	3.5
Common stock issued pursuant to acquisition		$ 39.1

Basis of Presentation	3 Months Ended
Basis of Presentation	Sep. 30, 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 30, 2018. 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 2019 is a 52-week period ending June 29, 2019, and our fiscal 2018 was a 53-week period ending on June 30, 2018. The fiscal periods presented in this report are 13-week and 14-week periods for the three months ended September 29, 2018, and September 30, 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 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 $0.4 million in the three months ended September 30, 2018 and net losses of $0.3 million in the three months ended September 30, 2017.

Revenue Recognition

3 Months Ended

Sep. 30, 2018

Revenue Recognition [Abstract]

Revenue Recognition

2. Revenue Recognition

Change in Accounting Policy

In May 2014, the FASB issued an Accounting Standards Update, or ASU, on revenue from contracts with customers, ASU No. 2014-09, Revenue from Contracts with Customers, or Topic 606. This standard update outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The guidance is effective for annual reporting periods including interim reporting reports beginning after December 15, 2017.

We adopted Topic 606 on July 1, 2018, the beginning of our fiscal 2019, using the modified retrospective method applied to all contracts not completed as of the adoption date. Results for reporting periods ending after July 1, 2018 are presented under Topic 606, while prior reporting periods are not adjusted and continue to be reported in accordance with our historic accounting under Topic 605. Recognition of revenue has remained substantially unchanged under Topic 606 as that under Topic 605. Hence, there was no adjustment to the opening retained earnings as of July 1, 2018. However, we reclassified certain amounts of incentive items to other accrued liabilities in our condensed consolidated balance sheet as of September 30, 2018, and presented them as part of customer obligations, from the contra accounts receivable upon adoption of Topic 606. Such information is as follows (in millions):

Condensed Consolidated Balance Sheets

	As of September 30, 2018
						Pro forma as if
	As reported under					previous standard
	new standard		Adjustments			was in effect
Accounts receivable, net	$	332.6	$	(4.8	)	$	327.8
Total assets		1,524.8		(4.8	)		1,520.0

Other accrued liabilities		101.0		(4.8	)		96.2
Total liabilities and stockholders' equity		1,524.8		(4.8	)		1,520.0

Condensed Consolidated Statement of Cash Flows

	Three Months Ended September 30, 2018
							Pro forma as if
	As reported under						previous standard
	new standard			Adjustments			was in effect
Cash flows from operating activities:
Accounts receivable, net	$	(38.3	)	$	(0.4	)	$	(38.7	)
Other accrued liabilities		16.0			0.4			16.4

Revenue Recognition

Our revenue is primarily generated from the sale of ASIC chips, either directly to a customer or to a distributor. Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to receive in exchange for those goods or services. All of our revenue, except an inconsequential amount, is recognized at a point in time, either on shipment or delivery of the product, depending on customer terms and conditions. We generally warrant our products for a period of 12 months from the date of sale and estimate probable product warranty costs at the time we recognize revenue as the warranty is considered an assurance warranty and not a performance obligation. Non-product revenue is recognized over the same period of time such performance obligations are satisfied. We then select an appropriate method for measuring satisfaction of the performance obligations.

Revenue from sales to distributors is recognized upon shipment of the product to the distributors (sell-in basis). Master sales agreements are in place with certain customers, and these agreements typically contain terms and conditions with respect to payment, delivery, warranty and supply. In the absence of a master sales agreement, we consider a customer's purchase order or our standard terms and conditions to be the contract with the customer.

Our pricing terms are negotiated independently, on a stand-alone basis. In determining the transaction price, we evaluate whether the price is subject to refund or adjustment to determine the net consideration which we expect to receive for the sale of such products. In limited situations, we make sales to certain customers under arrangements where we grant stock rotation rights, price protection and price allowances; variable consideration associated with these rights is expected to be inconsequential. These adjustments and incentives are accounted for as variable consideration, classified as other current liabilities under Topic 606 and are shown as customer obligations in Note 7 Other Accrued Liabilities. We estimate the amount of variable consideration for such arrangements based on the expected value to be provided to customers, and we do not believe that there will be significant changes to our estimates of variable consideration. When incentives, stock rotation rights, price protection, volume discounts, or price allowances are applicable, they are estimated and recorded in the period the related revenue is recognized. Stock rotation reserves are based on historical return rates and recorded as a reduction to revenue with a corresponding reduction to cost of goods sold for the estimated cost of inventory that is expected to be returned. In limited circumstances we enter into volume based tiered pricing arrangements and we estimate total unit volumes under such arrangement to determine the expected transaction price for the units expected to be transferred. Such arrangements are accounted for as contract liabilities within other accrued liabilities. Sales returns liabilities are recorded as refund liabilities within other accrued liabilities.

Our accounts receivable balance is from contracts with customers and represents our unconditional right to receive consideration from customers. Payments are generally due within three months upon completion of the performance obligation and subsequent invoicing and, therefore, do not include significant financing components. To date, there have been no material impairment losses on accounts receivable. There were no contract assets (i.e., unbilled accounts receivable, deferred commissions) recorded on the condensed consolidated balance sheets in the periods presented. Contract liabilities were $3.5 million as of September 30, 2018 and $1.1 million as of July 1, 2018. Refund liabilities were $32.7 million as of September 30, 2018 and $31.6 million as of July 1, 2018. Both contract liabilities and refund liabilities are presented as part of customer obligations in Note 7 Other Accrued Liabilities. During the three months ended September 30, 2018, we recognized $0.4 million in revenue related to contract liabilities outstanding as of July 1, 2018.

We invoice customers for each delivery upon shipment and recognize revenue in accordance with delivery terms. As of September 30, 2018, we did not have any remaining unsatisfied performance obligations with an original duration greater than one year. Accordingly, under the optional exception provided by ASC 606-10-50-14, we do not disclose revenues allocated to future performance obligations of partially completed contracts. We have elected to account for shipping and handling costs as fulfillment costs after the customer obtains control of the goods. We continue to classify shipping and handling costs as a cost of revenue. We have elected to continue to account for collection of all taxes on a net basis.

We incur commission expense that is incremental to obtaining contracts with customers. Sales commissions (which are recorded in the “selling, general and administrative” expense line item in the condensed consolidated statements of operations) are expensed when the product is shipped because such commissions are owed after shipment.

Revenue from contracts with customers disaggregated by geographic area based on customer location and groups of similar products is presented in Note 12. Segment, Customers, and Geographical Information.

Net Income Per Share

3 Months Ended

Sep. 30, 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
	September 30,
	2018		2017
Numerator:
Net income/(loss)	$	3.8	$	(26.5	)
Denominator:
Shares, basic		35.1		33.5
Effect of dilutive share-based awards		1.0		—
Shares, diluted		36.1		33.5
Net income/(loss) per share:
Basic	$	0.11	$	(0.79	)
Diluted	$	0.11	$	(0.79	)

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 1,357,565 and 3,291,154 shares of common stock related to certain share-based awards that were outstanding during the three months ended September 30, 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

3 Months Ended

Sep. 30, 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):

	September 30,						June 30,
	2018						2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets:
Money market funds	$	244.6	$	-	$	-	$	275.2	$	-	$	-
Auction rate securities		-		-		-		-		-		1.5
Total available-for-sale securities	$	244.6	$	-	$	-	$	275.2	$	-	$	1.5

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

During the three months ended September 30, 2018 we converted our ARS investments to senior surplus notes, under an offering memorandum, which also included a receipt of a small amount of cash and warrants. We sold the senior surplus notes during the three months ended September 30, 2018, resulting in a gain of $2.8 million. There were no transfers in or out of our Level 1, 2, or 3 assets during the three months ended September 30, 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

3 Months Ended

Sep. 30, 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):

	September 30,		June 30,
	2018		2018
Raw materials and work-in-progress	$	126.9	$	105.0
Finished goods		34.3		26.2
	$	161.2	$	131.2

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.

Acquired Intangibles and Goodwill

3 Months Ended

Sep. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Acquired Intangibles and Goodwill

6. 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 September 30, 2018 and June 30, 2018 (in millions):

			September 30, 2018							June 30, 2018
	Weighted Average Life in Years		Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Display driver technology		5.3	$	164.0	$	(124.4	)	$	39.6	$	164.0	$	(116.5	)	$	47.5
Audio and video technology		5.5		133.9		(29.4	)		104.5		133.9		(22.8	)		111.1
Fingerprint authentication technology		4.7		47.2		(47.2	)		-		55.7		(53.7	)		2.0
Customer relationships		4.1		81.8		(41.3	)		40.5		81.8		(38.5	)		43.3
Licensed technology and other		4.2		7.7		(2.1	)		5.6		9.0		(3.0	)		6.0
Tradename		7.0		1.8		(0.2	)		1.6		1.9		(0.2	)		1.7
Patents		8.1		4.4		(1.7	)		2.7		4.6		(1.7	)		2.9
Backlog	-			-		-			-		0.5		(0.5	)		-
In-process research and development	Not applicable			4.7		-			4.7		4.7		-			4.7
Acquired intangibles, gross		5.0	$	445.5	$	(246.3	)	$	199.2	$	456.1	$	(236.9	)	$	219.2

The total amortization expense for the acquired intangible assets was $20.0 million and $20.1 million for the three months ended September 30, 2018 and 2017, respectively. During the three months ended September 30, 2018 and 2017, $17.0 million and $16.0 million, 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 September 30, 2018 (in millions):

Remainder of 2019	$	54.0
2020		50.4
2021		36.5
2022		32.0
2023		19.5
2024		2.0
Thereafter		0.1
To be determined		4.7
Future amortization	$	199.2

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired. There were no changes in our goodwill balance for the three months ended September 30, 2018.

Other Accrued Liabilities

3 Months Ended

Sep. 30, 2018

Payables And Accruals [Abstract]

Other Accrued Liabilities

7. Other Accrued Liabilities

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

	September 30,		June 30,
	2018		2018
Customer Obligations	$	36.2	$	26.4
Inventory obligations		38.0		28.8
Warranty		3.8		5.5
Other		23.0		19.0
	$	101.0	$	79.7

Customer obligations include $3.5 million of contract liabilities and $32.7 million of refund liabilities as of September 30, 2018, as defined under revenue recognition guidance of Topic 606 (see Note 2 Revenue Recognition). We reclassified certain amounts of incentive items to other current liabilities in our condensed consolidated balance sheet as of September 30, 2018 and presented them as part of customer obligations, from the contra accounts receivable upon adoption of Topic 606.

Indemnifications, Contingencies and Legal Proceedings	3 Months Ended
Indemnifications, Contingencies and Legal Proceedings	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Indemnifications, Contingencies and Legal Proceedings	8. 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”). 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 were recorded in our condensed consolidated financial statements in fiscal 2017 and all but an immaterial amount was paid during our fiscal 2017. Pursuant to the Validity Agreement, we 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 as of June 30, 2018. In September 2018, we entered into a final order settling the indemnification claim against the former stockholders and option holders of Validity under which we retained $1.9 million of the earnout balance and were required to pay the remainder in October 2018. The balance of $6.8 million is a current acquisition-related liability in our condensed consolidated balance sheet as of September 30, 2018.

Debt

3 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

9. Debt

Convertible Debt

Our convertible debt consists of an original $525 million aggregate principal amount of 0.50% convertible senior notes due 2022, or the Notes, which were issued in a private placement transaction. The net proceeds from the Notes, after deducting discounts, were $514.5 million.

The Notes bear interest at a rate of 0.50% per year, which is payable semi-annually in arrears, on June 15 and December 15 of each year. 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 of the Notes 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 three months ended September 30, 2018, were as follows (in millions):

	Three Months Ended
	September 30,
	2018
Interest expense	$	0.7
Amortization of discount and debt issuance costs		4.4
Total interest	$	5.1

The unamortized amounts of the debt issuance costs and discount associated with the Notes as of September 30, 2018 were $7.0 million and $62.9 million, respectively.

Revolving Credit Facility

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 prior 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 September 30, 2018, there is no balance outstanding under the revolving credit facility.

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 relating to the revolving credit facility 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. As of September 30, 2018, 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

3 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

10. Share-Based Compensation

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

	Three Months Ended
	September 30,
	2018		2017
Cost of revenue	$	0.9	$	0.7
Research and development		8.3		9.1
Selling, general, and administrative		7.5		6.7
Total	$	16.7	$	16.5
Income tax benefit on share-based compensation	$	2.7	$	4.0

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, 2018		1,618,209		$	57.14
Granted		-		-
Exercised		(73,362	)		28.60
Forfeited		(17,923	)		70.09
Balance as of September 30, 2018		1,526,924			58.36	$	5.3
Exercisable at September 30, 2018		1,348,071			58.61	$	5.3

The aggregate intrinsic value was determined using the closing price of our common stock on September 28, 2018 of $45.62 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, 2018		1,853,558
Granted		110,135
Delivered		(84,433	)
Forfeited		(73,349	)
Balance as of September 30, 2018		1,805,911		$	82.4

The aggregate intrinsic value was determined using the closing price of our common stock on September 28, 2018 of $45.62.

Of the shares delivered, 17,416 shares valued at $0.9 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 made 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, less 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 three months ended September 30, 2018, MSU activity, including MSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of MSUs as of September 30, 2018 was as follows:

				Aggregate
	MSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2018		354,726
Granted		-
Performance adjustment		-
Delivered		-
Forfeited		(2,688	)
Balance as of September 30, 2018		352,038		$	16.1

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 $11.8 million as of September 30, 2018, which will be recognized over a weighted average period of approximately 1.3 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 three months ended September 30, 2018, PSU activity, including PSUs granted, delivered, and forfeited, and the balance and aggregate intrinsic value of PSUs as of September 30, 2018 was as follows:

				Aggregate
	PSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2018		294,541
Granted		-
Delivered		-
Forfeited		(2,688	)
Balance as of September 30, 2018		291,853		$	13.3

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 $6.0 million as of September 30, 2018, which will be recognized over a weighted average period of approximately 1.2 years.

Employee Stock Purchase Plan

There were no employee stock purchase plan purchases during the three-month period ended September 30, 2018.

Income Taxes	3 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	11. 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 was 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%. In fiscal 2018, we recognized provisional tax expense of $41.4 million, related to the tax impact of the Act, of which an expense of $44.1 million relates to the one-time transition tax and a benefit of $2.7 million relates to remeasurement of deferred tax at the new tax rate. As of September 30, 2018, we further analyzed these provisions and, as there were no material changes, no adjustment was made to amounts recognized in fiscal 2018. As of September 30, 2018, pending any additional technical guidance, the Company has, in many cases, finalized our accounting for the tax impact of the Act. We have completed our analysis regarding the remeasurement of deferred tax at the new rate, limitations on deduction of officer’s compensation, interest deduction, and net operating loss and the repeal of the Alternative Minimum Tax. We are still in the process of finalizing calculations related to the one-time transition tax. The Global Intangible Low-Tax Income, or GILTI, which is a provision under the Act, imposes a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. GILTI requires an accounting policy election of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current period expense when incurred or (2) factoring such amounts into the Company’s measurement of its deferred taxes. The Company has elected to treat GILTI as a current period expense. The one-time transition tax is based on our post-1986 foreign earnings and profits, or E&P, which we previously excluded from U.S. income taxes due to our position that we would permanently reinvest foreign 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 this one-time transition tax liability for our foreign subsidiaries, resulting in an increase in income tax liability of $11.6 million, net of foreign tax credits and research credits. 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 and the remeasurement of deferred tax under the new tax rate, 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 $(0.3) million and provision for income taxes of $3.2 million for the three months ended September 30, 2018 and 2017, respectively, represented estimated federal, foreign, and state income taxes. The effective tax rate for the three months ended September 30, 2018 diverged from the combined U.S. federal and state statutory tax rate primarily because of the benefit of research credits, foreign tax credits, foreign-derived intangible income deduction, excess share-based compensation deductions, release of reserves related to uncertain tax positions and foreign income taxed at lower tax rates, partially offset by foreign withholding taxes, nondeductible amortization, the impact of accounting for qualified stock options and global intangible low-taxed income. The effective tax rate for the three months ended September 30, 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 total liability for gross unrecognized tax benefits related to uncertain tax positions decreased $1.0 million during the three months ended September 30, 2018, to $23.8 million from $24.8 million at June 30, 2018, 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 September 30, 2018 were $2.0 million; this balance increased by $0.1 million compared to June 30, 2018. 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 include an increase in our liability of up to $4.3 million. In July 2018, the U.S. Ninth Circuit Court of Appeals reversed the 2015 decision of the U.S. Tax Court in Altera Corp. v. Commissioner which found that the Treasury regulations addressing the treatment of stock-based compensation in a cost-sharing arrangement with a related party were invalid. In August 2018, the U.S. Ninth Circuit Court of Appeals withdrew its July 2018 opinion to allow time for the reconstituted panel to confer on this appeal. As our tax filing position is consistent with the Treasury regulations, we determined no adjustment to our financial statements is required, however, 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 2013 onward, we remain subject to examination by one or more of these jurisdictions. In August 2018, we received the revenue agent’s report resolving the fiscal 2014 and 2015 examination with the Internal Revenue Service with no material impact on our consolidated financial statements. Our case is pending review by the Joint Committee on Taxation, which we anticipate will conclude in August 2019. Any prospective adjustments to our unrecognized tax benefits will be recorded as an increase or decrease to income tax expense and cause a corresponding change to our effective tax rate. Accordingly, our effective tax rate could fluctuate materially from period to period.

Segment, Customers, and Geographic Information

3 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment, Customers, and Geographic Information

12. 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
	September 30,
	2018		2017
China	$	227.8	$	209.7
Taiwan		76.4		43.2
Japan		68.5		91.0
South Korea		20.1		21.2
Other		15.4		16.1
United States		9.4		36.2
	$	417.6	$	417.4

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

	Three Months Ended
	September 30,
	2018		2017
Mobile product applications	$	262.7	$	292.9
PC product applications		68.6		65.3
IoT product applications		86.3		59.2
	$	417.6	$	417.4

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

	Three Months Ended
	September 30,
	2018			2017
Customer A		17	%		18	%
Customer B		11	%	*
Customer C	*				13	%
Customer D	*				11	%

*	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:

	September 30,			June 30,
	2018			2018
Customer A		21	%		10	%
Customer B		14	%		13	%
Customer C	*				11	%

*	Less than 10%

Comprehensive Income/(Loss)	3 Months Ended
Comprehensive Income/(Loss)	Sep. 30, 2018
Equity [Abstract]
Comprehensive Income/(Loss)	13. 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

3 Months Ended

Sep. 30, 2018

Restructuring And Related Activities [Abstract]

Restructuring Activities

14. Restructuring Activities

In November 2017, we committed to and initiated a restructuring action intended to streamline and reduce our operating cost structure and capitalize on acquisition synergies. These costs primarily related to severance costs for a reduction in headcount, facility consolidation and related costs. In April 2018, we committed to and initiated a restructuring to close a research and development facility. These costs included employee severance and related benefits and facility closure charges. Restructuring costs related to the November 2017 and April 2018 restructuring activities were recorded to the restructuring costs line item within our condensed consolidated statements of operations and are complete as of September 30, 2018.

The restructuring liability activities for these fiscal 2018 initiated activities during the three months ended September 30, 2018 were as follows (in millions):

	Employee Severance			Facility Consolidation
	and Benefits			and Related Charges			Total
Balance as of June 30, 2018	$	2.2		$	0.1		$	2.3
Accruals		0.2			-			0.2
Cash payments		(2.4	)		(0.1	)		(2.5	)
Non-cash settlements		-			-			-
Balance as of September 30, 2018	$	-		$	-		$	-

In August 2018, we committed to and initiated a restructuring of our mobile fingerprint optical business. These costs primarily related to severance costs for a reduction in headcount and related costs. Restructuring costs related to the fiscal 2019 restructuring activities were recorded to the restructuring costs line item within our condensed consolidated statements of operations. We estimate the costs to be $9.0 million to $10.0 million and expect the activities to be substantially complete by the end of the second quarter of our fiscal 2019.

The restructuring liability activities for this fiscal 2019 initiated activity during the three months ended September 30, 2018 were as follows (in millions):

	Employee Severance
	and Benefits
Accruals	$	8.1
Cash payments		(2.6	)
Non-cash settlements		-
Balance as of September 30, 2018	$	5.5

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Sep. 30, 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 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 $0.4 million in the three months ended September 30, 2018 and net losses of $0.3 million in the three months ended September 30, 2017.

Revenue Recognition (Tables)

3 Months Ended

Sep. 30, 2018

Topic 606 [Member]

Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Statements

Condensed Consolidated Balance Sheets

	As of September 30, 2018
						Pro forma as if
	As reported under					previous standard
	new standard		Adjustments			was in effect
Accounts receivable, net	$	332.6	$	(4.8	)	$	327.8
Total assets		1,524.8		(4.8	)		1,520.0

Other accrued liabilities		101.0		(4.8	)		96.2
Total liabilities and stockholders' equity		1,524.8		(4.8	)		1,520.0

Condensed Consolidated Statement of Cash Flows

	Three Months Ended September 30, 2018
							Pro forma as if
	As reported under						previous standard
	new standard			Adjustments			was in effect
Cash flows from operating activities:
Accounts receivable, net	$	(38.3	)	$	(0.4	)	$	(38.7	)
Other accrued liabilities		16.0			0.4			16.4

Net Income Per Share (Tables)

3 Months Ended

Sep. 30, 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
	September 30,
	2018		2017
Numerator:
Net income/(loss)	$	3.8	$	(26.5	)
Denominator:
Shares, basic		35.1		33.5
Effect of dilutive share-based awards		1.0		—
Shares, diluted		36.1		33.5
Net income/(loss) per share:
Basic	$	0.11	$	(0.79	)
Diluted	$	0.11	$	(0.79	)

Fair Value (Tables)

3 Months Ended

Sep. 30, 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):

	September 30,						June 30,
	2018						2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets:
Money market funds	$	244.6	$	-	$	-	$	275.2	$	-	$	-
Auction rate securities		-		-		-		-		-		1.5
Total available-for-sale securities	$	244.6	$	-	$	-	$	275.2	$	-	$	1.5

Inventories (Tables)

3 Months Ended

Sep. 30, 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):

	September 30,		June 30,
	2018		2018
Raw materials and work-in-progress	$	126.9	$	105.0
Finished goods		34.3		26.2
	$	161.2	$	131.2

Acquired Intangibles and Goodwill (Tables)

3 Months Ended

Sep. 30, 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 September 30, 2018 and June 30, 2018 (in millions):

			September 30, 2018							June 30, 2018
	Weighted Average Life in Years		Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Display driver technology		5.3	$	164.0	$	(124.4	)	$	39.6	$	164.0	$	(116.5	)	$	47.5
Audio and video technology		5.5		133.9		(29.4	)		104.5		133.9		(22.8	)		111.1
Fingerprint authentication technology		4.7		47.2		(47.2	)		-		55.7		(53.7	)		2.0
Customer relationships		4.1		81.8		(41.3	)		40.5		81.8		(38.5	)		43.3
Licensed technology and other		4.2		7.7		(2.1	)		5.6		9.0		(3.0	)		6.0
Tradename		7.0		1.8		(0.2	)		1.6		1.9		(0.2	)		1.7
Patents		8.1		4.4		(1.7	)		2.7		4.6		(1.7	)		2.9
Backlog	-			-		-			-		0.5		(0.5	)		-
In-process research and development	Not applicable			4.7		-			4.7		4.7		-			4.7
Acquired intangibles, gross		5.0	$	445.5	$	(246.3	)	$	199.2	$	456.1	$	(236.9	)	$	219.2

Schedule of Expected Annual Aggregate Amortization Expense

The following table presents expected annual fiscal year aggregate amortization expense as of September 30, 2018 (in millions):

Remainder of 2019	$	54.0
2020		50.4
2021		36.5
2022		32.0
2023		19.5
2024		2.0
Thereafter		0.1
To be determined		4.7
Future amortization	$	199.2

Other Accrued Liabilities (Tables)

3 Months Ended

Sep. 30, 2018

Payables And Accruals [Abstract]

Other Accrued Liabilities

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

	September 30,		June 30,
	2018		2018
Customer Obligations	$	36.2	$	26.4
Inventory obligations		38.0		28.8
Warranty		3.8		5.5
Other		23.0		19.0
	$	101.0	$	79.7

Debt (Tables)

3 Months Ended

Sep. 30, 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 three months ended September 30, 2018, were as follows (in millions):

	Three Months Ended
	September 30,
	2018
Interest expense	$	0.7
Amortization of discount and debt issuance costs		4.4
Total interest	$	5.1

Share-Based Compensation (Tables)

3 Months Ended

Sep. 30, 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
	September 30,
	2018		2017
Cost of revenue	$	0.9	$	0.7
Research and development		8.3		9.1
Selling, general, and administrative		7.5		6.7
Total	$	16.7	$	16.5
Income tax benefit on share-based compensation	$	2.7	$	4.0

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, 2018		1,618,209		$	57.14
Granted		-		-
Exercised		(73,362	)		28.60
Forfeited		(17,923	)		70.09
Balance as of September 30, 2018		1,526,924			58.36	$	5.3
Exercisable at September 30, 2018		1,348,071			58.61	$	5.3

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, 2018		1,853,558
Granted		110,135
Delivered		(84,433	)
Forfeited		(73,349	)
Balance as of September 30, 2018		1,805,911		$	82.4

Market stock units outstanding [Member]

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

Balance and Aggregate Intrinsic Value of Stock Units

				Aggregate
	MSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2018		354,726
Granted		-
Performance adjustment		-
Delivered		-
Forfeited		(2,688	)
Balance as of September 30, 2018		352,038		$	16.1

Performance stock units outstanding [Member]

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

Balance and Aggregate Intrinsic Value of Stock Units

				Aggregate
	PSU			Intrinsic
	Awards			Value
	Outstanding			(in millions)
Balance as of June 30, 2018		294,541
Granted		-
Delivered		-
Forfeited		(2,688	)
Balance as of September 30, 2018		291,853		$	13.3

Segment, Customers, and Geographic Information (Tables)

3 Months Ended

Sep. 30, 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
	September 30,
	2018		2017
China	$	227.8	$	209.7
Taiwan		76.4		43.2
Japan		68.5		91.0
South Korea		20.1		21.2
Other		15.4		16.1
United States		9.4		36.2
	$	417.6	$	417.4

Net Revenue from External Customers

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

	Three Months Ended
	September 30,
	2018		2017
Mobile product applications	$	262.7	$	292.9
PC product applications		68.6		65.3
IoT product applications		86.3		59.2
	$	417.6	$	417.4

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
	September 30,
	2018			2017
Customer A		17	%		18	%
Customer B		11	%	*
Customer C	*				13	%
Customer D	*				11	%

*	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:

	September 30,			June 30,
	2018			2018
Customer A		21	%		10	%
Customer B		14	%		13	%
Customer C	*				11	%

*	Less than 10%

Restructuring Activities (Tables)

3 Months Ended

Sep. 30, 2018

Restructuring And Related Activities [Abstract]

Restructuring Liability Activities

The restructuring liability activities for these fiscal 2018 initiated activities during the three months ended September 30, 2018 were as follows (in millions):

	Employee Severance			Facility Consolidation
	and Benefits			and Related Charges			Total
Balance as of June 30, 2018	$	2.2		$	0.1		$	2.3
Accruals		0.2			-			0.2
Cash payments		(2.4	)		(0.1	)		(2.5	)
Non-cash settlements		-			-			-
Balance as of September 30, 2018	$	-		$	-		$	-

The restructuring liability activities for this fiscal 2019 initiated activity during the three months ended September 30, 2018 were as follows (in millions):

	Employee Severance
	and Benefits
Accruals	$	8.1
Cash payments		(2.6	)
Non-cash settlements		-
Balance as of September 30, 2018	$	5.5

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Net gain (loss) on foreign currency transactions	$ (0.4)	$ (0.3)

Revenue Recognition - Additional Information (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Jul. 01, 2018	Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 610,200,000		$ 606,400,000
Contract asset	0
Contract liability	3,500,000	$ 1,100,000
Refund liability	32,700,000	31,600,000
Revenue recognized related to contract liabilities	$ 400,000
Description of payment terms in contract with customer	Payments are generally due within three months upon completion of the performance obligation and subsequent invoicing and, therefore, do not include significant financing components.
Maximum [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, performance obligation, payment terms	3 months
Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Remaining unsatisfied performance obligation	$ 0
Cumulative Impact of Adopting Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 0

Revenue Recognition - Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 332.6	$ 289.1
Total assets	1,524.8	1,499.8
Other accrued liabilities	101.0	79.7
Total liabilities and stockholders' equity	1,524.8	$ 1,499.8
Adjustments [Member] \| Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	(4.8)
Total assets	(4.8)
Other accrued liabilities	(4.8)
Total liabilities and stockholders' equity	(4.8)
Proforma as if previous standard was in effect [Member] \| Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	327.8
Total assets	1,520.0
Other accrued liabilities	96.2
Total liabilities and stockholders' equity	$ 1,520.0

Revenue Recognition - Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Accounts receivable, net	$ (38.3)	$ 13.2
Other accrued liabilities	16.0	$ (5.0)
Adjustments [Member] \| Topic 606 [Member]
Cash flows from operating activities:
Accounts receivable, net	(0.4)
Other accrued liabilities	0.4
Proforma as if previous standard was in effect [Member] \| Topic 606 [Member]
Cash flows from operating activities:
Accounts receivable, net	(38.7)
Other accrued liabilities	$ 16.4

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
	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income/(loss)	$ 3.8	$ (26.5)
Denominator:
Shares, basic	35.1	33.5
Effect of dilutive share-based awards	1.0
Shares, diluted	36.1	33.5
Net income/(loss) per share:
Basic	$ 0.11	$ (0.79)
Diluted	$ 0.11	$ (0.79)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Sep. 30, 2018	Sep. 30, 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	1,357,565	3,291,154

Fair Value - Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 244.6	$ 275.2
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities		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	$ 244.6	275.2
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

Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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
Senior Surplus Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on sale	$ 2,800,000

Inventories - Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Inventory Disclosure [Abstract]
Raw materials and work-in-progress	$ 126.9	$ 105.0
Finished goods	34.3	26.2
Total Inventories	$ 161.2	$ 131.2

Acquired Intangibles and Goodwill - Summary of Life, Gross Carrying Value and Related Accumulated Amortization of Acquired Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 445.5	$ 456.1
Acquired intangibles, Accumulated Amortization	(246.3)	(236.9)
Acquired intangibles, Net Carrying Value	$ 199.2	219.2
Weighted Average Life in Years	5 years
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 164.0	164.0
Acquired intangibles, Accumulated Amortization	(124.4)	(116.5)
Acquired intangibles, Net Carrying Value	$ 39.6	47.5
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 Carrying Value	$ 133.9	133.9
Acquired intangibles, Accumulated Amortization	(29.4)	(22.8)
Acquired intangibles, Net Carrying Value	$ 104.5	111.1
Weighted Average Life in Years	5 years 6 months
Fingerprint Authentication Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 47.2	55.7
Acquired intangibles, Accumulated Amortization	$ (47.2)	(53.7)
Acquired intangibles, Net Carrying Value		2.0
Weighted Average Life in Years	4 years 8 months 12 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 81.8	81.8
Acquired intangibles, Accumulated Amortization	(41.3)	(38.5)
Acquired intangibles, Net Carrying Value	$ 40.5	43.3
Weighted Average Life in Years	4 years 1 month 6 days
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 7.7	9.0
Acquired intangibles, Accumulated Amortization	(2.1)	(3.0)
Acquired intangibles, Net Carrying Value	$ 5.6	6.0
Weighted Average Life in Years	4 years 2 months 12 days
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 1.8	1.9
Acquired intangibles, Accumulated Amortization	(0.2)	(0.2)
Acquired intangibles, Net Carrying Value	$ 1.6	1.7
Weighted Average Life in Years	7 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 4.4	4.6
Acquired intangibles, Accumulated Amortization	(1.7)	(1.7)
Acquired intangibles, Net Carrying Value	$ 2.7	2.9
Weighted Average Life in Years	8 years 1 month 6 days
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value		0.5
Acquired intangibles, Accumulated Amortization		(0.5)
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 4.7	4.7
Acquired intangibles, Net Carrying Value	$ 4.7	$ 4.7

Acquired Intangibles and Goodwill - Additional Information (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles amortization	$ 20,000,000	$ 20,100,000
Changes in goodwill	0
Cost of Revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles amortization	$ 17,000,000	$ 16,000,000

Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 54.0
2020	50.4
2021	36.5
2022	32.0
2023	19.5
2024	2.0
Thereafter	0.1
To be determined	4.7
Acquired intangibles, Net Carrying Value	$ 199.2	$ 219.2

Other Accrued Liabilities - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Payables And Accruals [Abstract]
Customer Obligations	$ 36.2	$ 26.4
Inventory obligations	38.0	28.8
Warranty	3.8	5.5
Other	23.0	19.0
Other accrued liabilities	$ 101.0	$ 79.7

Other Accrued Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jul. 01, 2018
Payables And Accruals [Abstract]
Contract liabilities	$ 3.5	$ 1.1
Refund liabilities	$ 32.7	$ 31.6

Indemnifications, Contingencies and Legal Proceedings - Additional Information (Detail) - USD ($) $ in Millions	Oct. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Commitments Contingencies And Litigation [Line Items]
Contingent consideration liabilities recorded for business combinations		$ 6.8	$ 8.7
Subsequent Event [Member]
Commitments Contingencies And Litigation [Line Items]
Contingent consideration liabilities recorded for business combinations	$ 1.9

Debt - Additional Information (Detail)	3 Months Ended
Debt - Additional Information (Detail)	Sep. 30, 2018 USD ($) Day $ / shares shares	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Debt issuance cost		$ 1,100,000
Percentage of voting capital stock	65.00%
0.50% Convertible Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument aggregate principal amounts	$ 525,000,000
Net proceeds from issuance of convertible debt	$ 514,500,000
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	$ 7,000,000
Unamortized amounts of debt discount	$ 62,900,000
Amendment and Restatement Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt amortization period	60 months
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.
Outstanding principal amount	$ 0
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

Debt - Schedule of Contractual Interest Expense and Amortization of Discount on Notes (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Amortization of discount and debt issuance costs	$ 4.4	$ 4.3
0.50% Convertible Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Interest expense	0.7
Amortization of discount and debt issuance costs	4.4
Total interest	$ 5.1

Share-Based Compensation - Share-Based Compensation and Related Tax Benefit Recognized in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 16.7	$ 16.5
Income tax benefit on share-based compensation	2.7	4.0
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	0.9	0.7
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	8.3	9.1
Selling, General, and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 7.5	$ 6.7

Share-Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Awards Outstanding, Balance as of June 30, 2018 \| shares	1,618,209
Stock Option Awards Outstanding, Exercised \| shares	(73,362)
Stock Option Awards Outstanding, Forfeited \| shares	(17,923)
Stock Option Awards Outstanding, Balance as of September 30, 2018 \| shares	1,526,924
Stock Option Awards Outstanding, Exercisable at September 30, 2018 \| shares	1,348,071
Weighted Average Exercise Price, Balance as of June 30, 2018 \| $ / shares	$ 57.14
Weighted Average Exercise Price, Exercised \| $ / shares	28.60
Weighted Average Exercise Price, Forfeited \| $ / shares	70.09
Weighted Average Exercise Price, Balance as of September 30, 2018 \| $ / shares	58.36
Weighted Average Exercise Price, Exercisable at September 30, 2018 \| $ / shares	$ 58.61
Aggregate Intrinsic Value, Balance as of September 30, 2018 \| $	$ 5.3
Aggregate Intrinsic Value, Exercisable at September 30, 2018 \| $	$ 5.3

Share-Based Compensation - Stock Options - Additional Information (Detail)	Sep. 28, 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	$ 45.62

Share-Based Compensation - Balance and Aggregate Intrinsic Value of Stock Units (Detail) $ in Millions	3 Months Ended
	Sep. 30, 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, 2018	1,853,558
Stock Unit Awards, Granted	110,135
Stock Unit Awards, Delivered	(84,433)
Stock Unit Awards, Forfeited	(73,349)
Stock Unit Awards Outstanding, Balance as of September 30, 2018	1,805,911
Aggregate Intrinsic Value, Balance as of September 30, 2018 \| $	$ 82.4
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, 2018	354,726
Stock Unit Awards, Forfeited	(2,688)
Stock Unit Awards Outstanding, Balance as of September 30, 2018	352,038
Aggregate Intrinsic Value, Balance as of September 30, 2018 \| $	$ 16.1
Performance stock units outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Unit Awards Outstanding, Balance as of June 30, 2018	294,541
Stock Unit Awards, Forfeited	(2,688)
Stock Unit Awards Outstanding, Balance as of September 30, 2018	291,853
Aggregate Intrinsic Value, Balance as of September 30, 2018 \| $	$ 13.3

Share-Based Compensation - Deferred Stock Units - Additional Information (Detail) - Deferred stock units outstanding [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 28, 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		$ 45.62
Shares withheld to meet statutory tax withholding requirements	17,416
Shares valued withheld to meet statutory tax withholding requirements	$ 0.9

Share-Based Compensation - Market Stock Units - Additional Information (Detail) - Market stock units outstanding [Member] $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Potential payout adjustment ratio	2.00%
Unrecognized share-based compensation cost	$ 11.8
Unrecognized share-based compensation, period for recognition	1 year 3 months 18 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	3 Months Ended
	Sep. 30, 2018 USD ($)
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%
Requisite service period	3 years
Unrecognized share-based compensation cost	$ 6.0
Unrecognized share-based compensation, period for recognition	1 year 2 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 - Employee Stock Purchase Plan - Additional Information (Detail)	3 Months Ended
	Sep. 30, 2018 shares
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares purchased	0

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jun. 29, 2019	Jun. 30, 2018
Income Tax Disclosure [Line Items]
U.S. federal corporate tax rate	21.00%		35.00%		28.17%
Provisional tax expense					$ 41.4
One-time transition tax expense					44.1
Benefit from remeasurement of deferred tax at new tax rate					2.7
Increase in income tax iability, net of foreign tax and research credits	$ 11.6
Provision/(benefit) for income taxes	(0.3)	$ 3.2
Gross unrecognized tax benefits	23.8				24.8
Gross unrecognized tax benefits increased (decreased) during the year	(1.0)
Interest and penalties accrued related to unrecognized tax benefits	2.0
Increase in interest and penalties accrued related to unrecognized tax benefits					$ 0.1
Maximum [Member]
Income Tax Disclosure [Line Items]
Estimated increase in unrecognized tax benefit in next twelve months	4.3
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%
Other Specified Assets [Member]
Income Tax Disclosure [Line Items]
One-time transition tax rate on post-1986 foreign earnings and profits	8.00%
Scenario, Plan [Member]
Income Tax Disclosure [Line Items]
U.S. federal corporate tax rate				21.00%

Segment, Customers, and Geographic Information - Additional Information (Detail)	3 Months Ended
	Sep. 30, 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
	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 417.6	$ 417.4
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	227.8	209.7
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	76.4	43.2
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	68.5	91.0
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	20.1	21.2
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	15.4	16.1
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 9.4	$ 36.2

Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Revenue from External Customer [Line Items]
Net revenue	$ 417.6	$ 417.4
Mobile Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	262.7	292.9
PC Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	68.6	65.3
Internet of Things Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	$ 86.3	$ 59.2

Segment, Customers, and Geographic Information - Major Customers as Percentage of Net Revenue (Detail) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	17.00%	18.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%
Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		13.00%
Customer D [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		11.00%

Segment, Customers, and Geographic Information - Major Customers as Percentage of Net Revenue (Parenthetical) (Detail)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Maximum [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	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]	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	21.00%	10.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	14.00%	13.00%
Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		11.00%

Segment, Customers, and Geographic Information - Major Customer Accounts Receivable as Percentage of Accounts Receivable (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Maximum [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	10.00%

Restructuring Activities - Restructuring Liability Activities (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($)
November 2017 and April 2018 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	$ 2.3
Accruals	0.2
Cash payments	(2.5)
November 2017 and April 2018 Restructuring Plan [Member] \| Employee Severance And Benefits
Restructuring Cost And Reserve [Line Items]
Beginning Balance	2.2
Accruals	0.2
Cash payments	(2.4)
November 2017 and April 2018 Restructuring Plan [Member] \| Facility Consolidation And Related Charges
Restructuring Cost And Reserve [Line Items]
Beginning Balance	0.1
Cash payments	(0.1)
August 2018 Restructuring Plan [Member] \| Employee Severance And Benefits
Restructuring Cost And Reserve [Line Items]
Accruals	8.1
Cash payments	(2.6)
Ending Balance	$ 5.5

Restructuring Activities - Additional Information (Detail) $ in Millions	Aug. 31, 2018 USD ($)
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for second quarter of fiscal 2019	$ 9.0
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated cost of restructuring action for second quarter of fiscal 2019	$ 10.0