QLogic (QLGC) 10-Q 5 Feb 15 2015 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Dec. 28, 2014	Jan. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	28-Dec-14
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	QLGC
Entity Registrant Name	QLOGIC CORP
Entity Central Index Key	918386
Current Fiscal Year End Date	-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		87,346,000

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$95,508	$91,258
Marketable securities	192,424	186,783
Accounts receivable, less allowance for doubtful accounts of $1,583 and $1,186 as of December 28, 2014 and March 30, 2014, respectively	94,705	65,213
Inventories	30,939	18,036
Deferred tax assets	15,481	15,080
Other current assets	24,400	16,590
Total current assets	453,457	392,960
Property and equipment, net	74,841	86,527
Goodwill	167,232	167,232
Purchased intangible assets, net	82,091	95,163
Deferred tax assets	32,723	32,827
Other assets	21,157	23,554
Total assets	831,501	798,263
Current liabilities:
Accounts payable	38,804	30,657
Accrued compensation	19,455	26,956
Accrued taxes	3,511	981
Deferred revenue	3,469	3,954
Other current liabilities	5,999	16,123
Total current liabilities	71,238	78,671
Accrued taxes	15,166	17,095
Other liabilities	8,282	9,071
Total liabilities	94,686	104,837
Stockholders' equity:
Preferred stock, $0.001 par value; 1,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.001 par value; 500,000,000 shares authorized; 214,979,000 and 213,786,000 shares issued as of December 28, 2014 and March 30, 2014, respectively	215	214
Additional paid-in capital	974,740	958,008
Retained earnings	1,711,516	1,672,071
Accumulated other comprehensive income (loss)	-520	435
Treasury stock, at cost: 127,633,000 and 126,616,000 shares as of December 28, 2014 and March 30, 2014, respectively	-1,949,136	-1,937,302
Total stockholders' equity	736,815	693,426
Total liabilities and stockholders' equity	$831,501	$798,263

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$1,583	$1,186
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	214,979,000	213,786,000
Treasury stock, shares	127,633,000	126,616,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Net revenues	$140,203	$119,449	$387,155	$345,187
Cost of revenues	57,802	38,446	158,649	111,378
Gross profit	82,401	81,003	228,506	233,809
Operating expenses:
Engineering and development	34,802	35,235	108,103	110,412
Sales and marketing	16,153	16,113	47,640	51,957
General and administrative	7,677	7,406	25,274	22,698
Special charges	69	1,947	4,872	18,329
Total operating expenses	58,701	60,701	185,889	203,396
Operating income	23,700	20,302	42,617	30,413
Interest and other income (expense), net	-269	970	169	1,768
Income before income taxes	23,431	21,272	42,786	32,181
Income taxes	996	686	3,341	3,668
Net income	$22,435	$20,586	$39,445	$28,513
Net income per share:
Basic	$0.26	$0.24	$0.45	$0.32
Diluted	$0.25	$0.24	$0.45	$0.32
Number of shares used in per share calculations:
Basic	87,728	86,855	87,679	87,810
Diluted	88,527	87,186	88,294	88,209

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Statement of Comprehensive Income [Abstract]
Net income	$22,435	$20,586	$39,445	$28,513
Changes in fair value of marketable securities:
Changes in unrealized gains	-329	-35	-477	-1,354
Net realized losses (gains) reclassified into earnings	-3	-84	124	-343
Total changes in fair value of marketable securities	-332	-119	-353	-1,697
Foreign currency translation adjustments	-391	101	-602	59
Total other comprehensive loss	-723	-18	-955	-1,638
Comprehensive income	$21,712	$20,568	$38,490	$26,875

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Cash flows from operating activities:
Net income	$39,445	$28,513
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,511	23,620
Stock-based compensation	15,178	18,047
Deferred income taxes	-316	-5,355
Asset impairments	1,455	3,129
Other non-cash items	1,257	2,577
Changes in operating assets and liabilities:
Accounts receivable	-29,892	-5,088
Inventories	-12,903	6,116
Other assets	1,236	537
Accounts payable	4,121	-1,919
Accrued compensation	-7,501	-2,719
Accrued taxes, net	1,147	7,734
Other liabilities	-11,398	2,841
Net cash provided by operating activities	37,340	78,033
Cash flows from investing activities:
Purchases of available-for-sale securities	-123,431	-259,008
Proceeds from sales and maturities of available-for-sale securities	116,260	261,253
Purchases of property and equipment	-15,420	-21,043
Net cash used in investing activities	-22,591	-18,798
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	5,144	6,756
Minimum tax withholding paid on behalf of employees for restricted stock units	-3,589	-4,584
Purchases of treasury stock	-11,834	-47,785
Other financing activities	-220	-156
Net cash used in financing activities	-10,499	-45,769
Net increase in cash and cash equivalents	4,250	13,466
Cash and cash equivalents at beginning of period	91,258	95,532
Cash and cash equivalents at end of period	$95,508	$108,998

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Dec. 28, 2014
Accounting Policies [Abstract]
Basis of Presentation	Note 1. Basis of Presentation
	In the opinion of management of QLogic Corporation (QLogic or the Company), the accompanying unaudited condensed consolidated financial statements contain all normal recurring accruals and adjustments necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 30, 2014. The results of operations for the three and nine months ended December 28, 2014 are not necessarily indicative of the results that may be expected for the entire fiscal year. The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes. The Company evaluates its estimates on an ongoing basis using historical experience and other factors, including the current economic environment. Among the significant estimates affecting the consolidated financial statements are those related to revenue recognition, stock-based compensation, income taxes, marketable securities, inventories, goodwill and other intangible assets, and long-lived assets. The actual results experienced by the Company could differ materially from management’s estimates.
	Recently Adopted Accounting Standards
	In July 2013, the Financial Accounting Standards Board issued an accounting standard update that requires certain unrecognized tax benefits be presented as a reduction to deferred tax assets rather than as liabilities when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The Company adopted this standard in the first quarter of fiscal 2015 on a prospective basis and the adoption did not have a material effect on the Company’s condensed consolidated balance sheet.

Business_Acquisition

Business Acquisition	9 Months Ended
	Dec. 28, 2014
Business Combinations [Abstract]
Business Acquisition	Note 2. Business Acquisition
	Broadcom Corporation
	In March 2014, the Company acquired certain 10/40/100Gb Ethernet controller-related assets from Broadcom Corporation (Broadcom) primarily relating to the NetXtreme® II Ethernet controller family and licensed certain related intellectual property under non-exclusive licenses for total cash consideration of $147.8 million and the assumption of certain liabilities.
	In the fourth quarter of fiscal 2014, the Company preliminarily estimated the fair value of the assets acquired and liabilities assumed and allocated a portion of the total purchase consideration to tangible and identifiable intangible assets acquired and liabilities assumed based on their respective estimated fair values as of the acquisition date. Subsequently, the Company completed the identification and valuation of certain acquired property and equipment and also completed the transfer of property and equipment in a foreign jurisdiction that was subject to local compliance requirements, resulting in a total increase in property and equipment of $1.6 million with a corresponding decrease in goodwill. During the three months ended December 28, 2014, the Company completed the final assessment of the fair value of the tangible and identifiable intangible assets acquired and liabilities assumed, including the fair value measurement of developed technology, in-process research and development (IPR&D) and customer relationship intangible assets, resulting in an increase in identifiable intangible assets acquired of $25.3 million with a corresponding decrease in goodwill. The Company’s condensed consolidated balance sheet as of March 30, 2014 has been revised to retroactively reflect the final allocation of the purchase price. The excess of the total purchase consideration over the aggregate estimated fair value of the net assets acquired was recorded as goodwill. The goodwill associated with this acquisition is expected to be tax deductible. The following table summarizes the final allocation of the purchase price to the fair value of the assets acquired and liabilities assumed:
		(In thousands)
	Inventories	$	2,880
	Other current assets		307
	Property and equipment		4,070
	Goodwill		56,256
	Identifiable intangible assets		85,360
	Accrued compensation		(987	)
	Other current liabilities		(129	)
		$	147,757
	A summary of the identifiable intangible assets acquired as part of the acquisition and their respective estimated useful lives is as follows:
		Weighted			Amount
		Average
		Useful Lives
		(Years)			(In thousands)
	Identifiable Intangible Assets:
	Developed technology		5		$	58,760
	In-process research and development		N/A			21,200
	Customer relationships		8			5,400
					$	85,360
	The Company believes the amounts recorded as developed technology, IPR&D and customer relationships represent the fair value of these identifiable intangible assets as of the acquisition date. These assets are measured at fair value on a nonrecurring basis and are categorized as Level 3 due to the use of significant unobservable inputs in the valuation.
	The fair values of the identifiable intangible assets related to this acquisition were determined using the income approach. Under the income approach, expected future cash flows are estimated and discounted to their net present value at an appropriate risk-adjusted rate of return. Significant factors considered in the calculation of the rate of return are the weighted average cost of capital and the return on assets. For technology-related intangible assets, such as developed technology and IPR&D, additional factors considered include the risks inherent in the development process, the likelihood of achieving technological success and market acceptance. For IPR&D, the project is further analyzed to determine the unique technological innovations, the reliance on developed technology, if any, the existence of any alternative future use or current technological feasibility, and the complexity, cost and time to complete the remaining development. Future cash flows related to these identifiable intangible assets were estimated based on forecasted revenue and costs, taking into consideration expected product life cycles, market penetration and growth rates. The Company used risk adjusted discount rates of between 14.5% and 17.0% to discount the expected future cash flows under the income approach.
	IPR&D is capitalized and accounted for as an indefinite-lived intangible asset. Once completed, IPR&D assets are reclassified to developed technology and amortized over their estimated useful lives. The IPR&D project acquired by the Company in March 2014 is related to next generation 40/100Gb Ethernet products. As of the acquisition date, the Company estimated that the project was 40% complete, had an estimated remaining cost to complete of $6 million and an estimated remaining time to complete of two years.

Marketable_Securities

Marketable Securities	9 Months Ended
	Dec. 28, 2014
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Note 3. Marketable Securities
	The Company’s portfolio of available-for-sale marketable securities consists of the following:
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
		(In thousands)
	December 28, 2014
	U.S. government and agency securities	$	44,077	$	11		$	(53	)	$	44,035
	Corporate debt obligations		89,843		51			(287	)		89,607
	Mortgage-backed securities		30,573		155			(95	)		30,633
	Municipal bonds		20,163		68			(20	)		20,211
	Other debt securities		7,951		1			(14	)		7,938
		$	192,607	$	286		$	(469	)	$	192,424
	March 30, 2014
	U.S. government and agency securities	$	49,237	$	16		$	(55	)	$	49,198
	Corporate debt obligations		74,386		200			(72	)		74,514
	Mortgage-backed securities		32,778		191			(187	)		32,782
	Municipal bonds		24,989		133			(9	)		25,113
	Other debt securities		5,178		3			(5	)		5,176
		$	186,568	$	543		$	(328	)	$	186,783
	The amortized cost and estimated fair value of debt securities as of December 28, 2014, by contractual maturity, are presented below. Expected maturities will differ from contractual maturities because the issuers of securities may have the right to repay obligations without prepayment penalties. Certain debt instruments, although possessing a contractual maturity greater than one year, are classified as short-term marketable securities based on their ability to be traded on active markets and availability for current operations.
		Amortized		Estimated
		Cost		Fair Value
		(In thousands)
	Due in one year or less	$	18,047	$	18,054
	Due after one year through three years		144,154		143,896
	Due after three years through five years		11,586		11,569
	Due after five years		18,820		18,905
		$	192,607	$	192,424
	The following table presents the Company’s marketable securities with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 28, 2014 and March 30, 2014.
		Less Than 12 Months					12 Months or Greater						Total
	Description of Securities	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	December 28, 2014
	U.S. government and agency securities	$	31,711	$	(53	)	$	—		$	—		$	31,711	$	(53	)
	Corporate debt obligations		65,215		(287	)		—			—			65,215		(287	)
	Mortgage-backed securities		7,554		(29	)		6,088			(66	)		13,642		(95	)
	Municipal bonds		6,111		(20	)		—			—			6,111		(20	)
	Other debt securities		6,062		(14	)		—			—			6,062		(14	)
		$	116,653	$	(403	)	$	6,088		$	(66	)	$	122,741	$	(469	)
	March 30, 2014
	U.S. government and agency securities	$	26,879	$	(55	)	$	—		$	—		$	26,879	$	(55	)
	Corporate debt obligations		19,906		(72	)		—			—			19,906		(72	)
	Mortgage-backed securities		11,261		(145	)		2,838			(42	)		14,099		(187	)
	Municipal bonds		3,322		(9	)		—			—			3,322		(9	)
	Other debt securities		2,955		(5	)		—			—			2,955		(5	)
		$	64,323	$	(286	)	$	2,838		$	(42	)	$	67,161	$	(328	)
	As of December 28, 2014 and March 30, 2014, the fair value of certain of the Company’s available-for-sale securities was less than their cost basis. Management reviewed various factors in determining whether to recognize an impairment charge related to these unrealized losses, including the current financial and credit market environment, the financial condition and near-term prospects of the issuer of the security, the magnitude of the unrealized loss compared to the cost of the investment, the length of time the investment had been in a loss position and the Company’s intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery of market value. As of December 28, 2014 and March 30, 2014, the Company determined that the unrealized losses were temporary in nature and recorded them as a component of accumulated other comprehensive income.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Dec. 28, 2014
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 4. Fair Value of Financial Instruments
	The Company’s financial instruments consist principally of cash and cash equivalents, marketable securities, accounts receivable and accounts payable. The carrying value of accounts receivable and accounts payable approximates fair value.
	A summary of the assets measured at fair value on a recurring basis as of December 28, 2014 and March 30, 2014 are as follows:
		Fair Value Measurements Using
		Level 1		Level 2		Total
		(In thousands)
	December 28, 2014
	Cash and cash equivalents	$	95,508	$	—	$	95,508
	Marketable securities:
	U.S. government and agency securities		44,035		—		44,035
	Corporate debt obligations		—		89,607		89,607
	Mortgage-backed securities		—		30,633		30,633
	Municipal bonds		—		20,211		20,211
	Other debt securities		—		7,938		7,938
			44,035		148,389		192,424
		$	139,543	$	148,389	$	287,932
	March 30, 2014
	Cash and cash equivalents	$	91,258	$	—	$	91,258
	Marketable securities:
	U.S. government and agency securities		49,198		—		49,198
	Corporate debt obligations		—		74,514		74,514
	Mortgage-backed securities		—		32,782		32,782
	Municipal bonds		—		25,113		25,113
	Other debt securities		—		5,176		5,176
			49,198		137,585		186,783
		$	140,456	$	137,585	$	278,041
	The Company’s investments classified within Level 2 were primarily valued based on valuations obtained from a third-party pricing service. To estimate fair value, the pricing service utilizes industry-standard valuation models, including both income and market-based approaches for which all significant inputs are observable either directly or indirectly. The Company obtained documentation from the pricing service as to the methodology and summary of inputs used for the various types of securities. The pricing service maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs. These observable inputs include reported trades and broker/dealer quotes of the same or similar securities, issuer credit spreads, benchmark securities and other observable inputs. The Company compares valuation information from the pricing service with other pricing sources to validate the reasonableness of the valuations.

Inventories

Inventories	9 Months Ended
	Dec. 28, 2014
Inventory Disclosure [Abstract]
Inventories	Note 5. Inventories
	Components of inventories are as follows:
		December 28,		March 30,
		2014		2014
		(In thousands)
	Raw materials	$	1,974	$	2,041
	Finished goods		28,965		15,995
		$	30,939	$	18,036

Purchased_Intangible_Assets

Purchased Intangible Assets	9 Months Ended
	Dec. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	Note 6. Purchased Intangible Assets
	Purchased intangible assets consist of the following:
		December 28, 2014						March 30, 2014
		Gross		Accumulated		Net		Gross		Accumulated		Net
		Carrying		Amortization		Carrying		Carrying		Amortization		Carrying
		Value				Value		Value				Value
		(In thousands)
	Developed technology	$	72,121	$	17,323	$	54,798	$	72,121	$	4,957	$	67,164
	In-process research and development		21,200		—		21,200		21,200		—		21,200
	Customer relationships		5,400		534		4,866		5,400		—		5,400
	Other		3,829		2,602		1,227		3,829		2,430		1,399
		$	102,550	$	20,459	$	82,091	$	102,550	$	7,387	$	95,163

Treasury_Stock

Treasury Stock	9 Months Ended
	Dec. 28, 2014
Equity [Abstract]
Treasury Stock	Note 7. Treasury Stock
	Since fiscal 2003, the Company has had various stock repurchase programs that authorized the purchase of the Company’s outstanding common stock. In October 2014, the Company’s Board of Directors approved a program authorizing the repurchase of up to $100 million of the Company’s outstanding common stock over a period of up to 18 months. During the nine months ended December 28, 2014, the Company purchased 1.0 million shares of its common stock for an aggregate purchase price of $11.8 million. As of December 28, 2014, the Company had purchased a total of 127.6 million shares of common stock under these repurchase programs for an aggregate purchase price of $1.95 billion.
	Repurchased shares have been recorded as treasury shares and will be held until the Company’s Board of Directors designates that these shares be retired or used for other purposes.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Dec. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Note 8. Stock-Based Compensation
	During the nine months ended December 28, 2014, the Company granted 2.2 million restricted stock units with a weighted average grant date fair value of $10.26 per share.
	A summary of stock-based compensation expense, by functional line item in the condensed consolidated statements of income, is as follows:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(In thousands)
	Cost of revenues	$	258	$	259	$	871	$	1,082
	Engineering and development		2,243		2,462		7,523		9,070
	Sales and marketing		1,182		1,251		3,265		4,274
	General and administrative		1,220		1,086		3,519		3,621
		$	4,903	$	5,058	$	15,178	$	18,047

Special_Charges

Special Charges	9 Months Ended
	Dec. 28, 2014
Restructuring and Related Activities [Abstract]
Special Charges	Note 9. Special Charges
	A summary of the special charges recorded during the three and nine months ended December 28, 2014 and December 29, 2013, respectively, is as follows:
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(In thousands)
	Exit costs	$	69		$	1,947		$	3,361		$	15,900
	Asset impairments		—			—			1,011			2,429
	Other charges		—			—			500			—
		$	69		$	1,947		$	4,872		$	18,329
	March 2014 Initiative
	In March 2014, the Company commenced a restructuring plan (March 2014 Initiative) primarily designed to consolidate its Ethernet product roadmap following the acquisition of the Ethernet controller-related assets from Broadcom. This restructuring plan primarily included a workforce reduction and the consolidation and elimination of certain engineering activities. The Company completed these restructuring activities and all amounts were paid as of December 28, 2014.
	During the nine months ended December 28, 2014, the Company recorded special charges of $3.6 million in connection with the March 2014 Initiative. Special charges for the nine months ended December 28, 2014 consisted of $2.6 million of exit costs and $1.0 million of asset impairment charges related to abandoned property and equipment. The exit costs consisted of severance and related costs associated with involuntarily terminated employees.
	The aggregate amount of the exit costs recorded in connection with the March 2014 Initiative was $11.7 million and consisted of $7.5 million of workforce reduction costs and $4.2 million of contract cancellation and other costs.
	Activity and liability balances for exit costs related to the March 2014 Initiative are as follows:
		Workforce			Contract			Total
		Reduction			Cancellation
					and Other
		(In thousands)
	Balance as of March 30, 2014	$	3,177		$	4,311		$	7,488
	Charged to costs and expenses		2,693			(73	)		2,620
	Payments		(5,870	)		(4,238	)		(10,108	)
	Balance as of December 28, 2014	$	—		$	—		$	—
	June 2013 Initiative
	In June 2013, the Company commenced a restructuring plan (June 2013 Initiative) designed to enhance product focus and streamline business operations. The restructuring plan includes a workforce reduction and the consolidation and elimination of certain engineering activities. In connection with this plan, the Company ceased development of future application-specific integrated circuits (ASICs) for switch products.
	During the three and nine months ended December 28, 2014, the Company recorded special charges of $0.1 million and $0.7 million in connection with the June 2013 Initiative, consisting of exit costs associated with severance and related costs for involuntarily terminated employees. Certain employees that were notified of their termination are required to provide future services for varying periods. Severance costs related to these services are recognized ratably over the estimated requisite service period. The Company expects to incur approximately $1 million of additional severance costs in connection with these employees over the requisite service period.
	The aggregate amount of the exit costs recorded in connection with the June 2013 Initiative is $18.1 million and consisted of $14.6 million of workforce reduction costs and $3.5 million of facilities and other costs.
	Activity and liability balances for exit costs related to the June 2013 Initiative are as follows:
		Workforce			Facilities			Total
		Reduction			and Other
		(In thousands)
	Balance as of March 30, 2014	$	3,528		$	4,621		$	8,149
	Charged to costs and expenses		741			—			741
	Payments		(1,798	)		(837	)		(2,635	)
	Balance as of December 28, 2014	$	2,471		$	3,784		$	6,255
	The total unpaid exit costs are expected to be paid over the terms of the related agreements through fiscal 2018. As of December 28, 2014, unpaid exit costs totaling $1.5 million and $4.8 million are included in other current liabilities and other liabilities, respectively.

Income_Taxes

Income Taxes	9 Months Ended
	Dec. 28, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Note 10. Income Taxes
	The Company’s provision for income taxes was $1.0 million and $3.3 million for the three and nine months ended December 28, 2014, respectively, and $0.7 million and $3.7 million for the three and nine months ended December 29, 2013, respectively. Income tax expense for the three and nine months ended December 28, 2014 included a $3.7 million benefit related to the retroactive reinstatement of the federal research tax credit. Income tax expense for the three and nine months ended December 28, 2014 and December 29, 2013 was also impacted by the effect of a discrete tax related item associated with the difference between stock-based compensation expense and the deduction related to stock-based awards on income tax returns. The Company’s provision for income taxes is based on the estimated income for the year, the composition of the estimated income in different tax jurisdictions, and the tax effect, if any, in the applicable quarterly periods of newly enacted tax legislation, resolution of tax audits, changes in uncertain tax positions, and other discrete tax-related items. The allocation of taxable income to domestic and foreign tax jurisdictions impacts the effective tax rate, as the Company’s income tax rate in foreign jurisdictions is generally lower than its income tax rate in the United States.
	The Company’s federal consolidated income tax returns for fiscal years 2010, 2011 and 2012 are currently under examination by the Internal Revenue Service. Management does not believe that the results of this examination will have a material impact on the Company’s financial condition or results of operations.

Net_Income_Per_Share

Net Income Per Share	9 Months Ended
	Dec. 28, 2014
Earnings Per Share [Abstract]
Net Income Per Share	Note 11. Net Income Per Share
	The following table sets forth the computation of basic and diluted net income per share:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(In thousands, except per share amounts)
	Net income	$	22,435	$	20,586	$	39,445	$	28,513
	Shares:
	Weighted-average shares outstanding — basic		87,728		86,855		87,679		87,810
	Dilutive potential common shares, using treasury stock method		799		331		615		399
	Weighted-average shares outstanding — diluted		88,527		87,186		88,294		88,209
	Net income per share:
	Basic	$	0.26	$	0.24	$	0.45	$	0.32
	Diluted	$	0.25	$	0.24	$	0.45	$	0.32
	Stock-based awards, including stock options and restricted stock units, representing 8.9 million and 10.7 million shares of common stock have been excluded from the diluted per share calculations for the three and nine months ended December 28, 2014, respectively, and 12.1 million and 14.8 million shares of common stock have been excluded from the diluted per share calculations for the three and nine months ended December 29, 2013, respectively. These stock-based awards have been excluded from the diluted per share calculations because their effect would have been antidilutive.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Dec. 28, 2014
Accounting Policies [Abstract]
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards
	In July 2013, the Financial Accounting Standards Board issued an accounting standard update that requires certain unrecognized tax benefits be presented as a reduction to deferred tax assets rather than as liabilities when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The Company adopted this standard in the first quarter of fiscal 2015 on a prospective basis and the adoption did not have a material effect on the Company’s condensed consolidated balance sheet.

Business_Acquisition_Tables

Business Acquisition (Tables)	9 Months Ended
	Dec. 28, 2014
Business Combinations [Abstract]
Summary of Final Purchase Price Allocation	The following table summarizes the final allocation of the purchase price to the fair value of the assets acquired and liabilities assumed:
		(In thousands)
	Inventories	$	2,880
	Other current assets		307
	Property and equipment		4,070
	Goodwill		56,256
	Identifiable intangible assets		85,360
	Accrued compensation		(987	)
	Other current liabilities		(129	)
		$	147,757
Summary of Identifiable Intangible Assets Acquired and Estimated Useful Lives	A summary of the identifiable intangible assets acquired as part of the acquisition and their respective estimated useful lives is as follows:
		Weighted			Amount
		Average
		Useful Lives
		(Years)			(In thousands)
	Identifiable Intangible Assets:
	Developed technology		5		$	58,760
	In-process research and development		N/A			21,200
	Customer relationships		8			5,400
					$	85,360

Marketable_Securities_Tables

Marketable Securities (Tables)	9 Months Ended
	Dec. 28, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-Sale Securities	The Company’s portfolio of available-for-sale marketable securities consists of the following:
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
		(In thousands)
	December 28, 2014
	U.S. government and agency securities	$	44,077	$	11		$	(53	)	$	44,035
	Corporate debt obligations		89,843		51			(287	)		89,607
	Mortgage-backed securities		30,573		155			(95	)		30,633
	Municipal bonds		20,163		68			(20	)		20,211
	Other debt securities		7,951		1			(14	)		7,938
		$	192,607	$	286		$	(469	)	$	192,424
	March 30, 2014
	U.S. government and agency securities	$	49,237	$	16		$	(55	)	$	49,198
	Corporate debt obligations		74,386		200			(72	)		74,514
	Mortgage-backed securities		32,778		191			(187	)		32,782
	Municipal bonds		24,989		133			(9	)		25,113
	Other debt securities		5,178		3			(5	)		5,176
		$	186,568	$	543		$	(328	)	$	186,783
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities	The amortized cost and estimated fair value of debt securities as of December 28, 2014, by contractual maturity, are presented below. Expected maturities will differ from contractual maturities because the issuers of securities may have the right to repay obligations without prepayment penalties. Certain debt instruments, although possessing a contractual maturity greater than one year, are classified as short-term marketable securities based on their ability to be traded on active markets and availability for current operations.
		Amortized		Estimated
		Cost		Fair Value
		(In thousands)
	Due in one year or less	$	18,047	$	18,054
	Due after one year through three years		144,154		143,896
	Due after three years through five years		11,586		11,569
	Due after five years		18,820		18,905
		$	192,607	$	192,424
Schedule of Unrealized Losses by Investment Category	The following table presents the Company’s marketable securities with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 28, 2014 and March 30, 2014.
		Less Than 12 Months					12 Months or Greater						Total
	Description of Securities	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In thousands)
	December 28, 2014
	U.S. government and agency securities	$	31,711	$	(53	)	$	—		$	—		$	31,711	$	(53	)
	Corporate debt obligations		65,215		(287	)		—			—			65,215		(287	)
	Mortgage-backed securities		7,554		(29	)		6,088			(66	)		13,642		(95	)
	Municipal bonds		6,111		(20	)		—			—			6,111		(20	)
	Other debt securities		6,062		(14	)		—			—			6,062		(14	)
		$	116,653	$	(403	)	$	6,088		$	(66	)	$	122,741	$	(469	)
	March 30, 2014
	U.S. government and agency securities	$	26,879	$	(55	)	$	—		$	—		$	26,879	$	(55	)
	Corporate debt obligations		19,906		(72	)		—			—			19,906		(72	)
	Mortgage-backed securities		11,261		(145	)		2,838			(42	)		14,099		(187	)
	Municipal bonds		3,322		(9	)		—			—			3,322		(9	)
	Other debt securities		2,955		(5	)		—			—			2,955		(5	)
		$	64,323	$	(286	)	$	2,838		$	(42	)	$	67,161	$	(328	)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Dec. 28, 2014
Fair Value Disclosures [Abstract]
Schedule of Assets Measured at Fair Value on a Recurring Basis	A summary of the assets measured at fair value on a recurring basis as of December 28, 2014 and March 30, 2014 are as follows:
		Fair Value Measurements Using
		Level 1		Level 2		Total
		(In thousands)
	December 28, 2014
	Cash and cash equivalents	$	95,508	$	—	$	95,508
	Marketable securities:
	U.S. government and agency securities		44,035		—		44,035
	Corporate debt obligations		—		89,607		89,607
	Mortgage-backed securities		—		30,633		30,633
	Municipal bonds		—		20,211		20,211
	Other debt securities		—		7,938		7,938
			44,035		148,389		192,424
		$	139,543	$	148,389	$	287,932
	March 30, 2014
	Cash and cash equivalents	$	91,258	$	—	$	91,258
	Marketable securities:
	U.S. government and agency securities		49,198		—		49,198
	Corporate debt obligations		—		74,514		74,514
	Mortgage-backed securities		—		32,782		32,782
	Municipal bonds		—		25,113		25,113
	Other debt securities		—		5,176		5,176
			49,198		137,585		186,783
		$	140,456	$	137,585	$	278,041

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Dec. 28, 2014
Inventory Disclosure [Abstract]
Components of Inventories	Components of inventories are as follows:
		December 28,		March 30,
		2014		2014
		(In thousands)
	Raw materials	$	1,974	$	2,041
	Finished goods		28,965		15,995
		$	30,939	$	18,036

Purchased_Intangible_Assets_Ta

Purchased Intangible Assets (Tables)	9 Months Ended
	Dec. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Components of Purchased Intangible Assets	Purchased intangible assets consist of the following:
		December 28, 2014						March 30, 2014
		Gross		Accumulated		Net		Gross		Accumulated		Net
		Carrying		Amortization		Carrying		Carrying		Amortization		Carrying
		Value				Value		Value				Value
		(In thousands)
	Developed technology	$	72,121	$	17,323	$	54,798	$	72,121	$	4,957	$	67,164
	In-process research and development		21,200		—		21,200		21,200		—		21,200
	Customer relationships		5,400		534		4,866		5,400		—		5,400
	Other		3,829		2,602		1,227		3,829		2,430		1,399
		$	102,550	$	20,459	$	82,091	$	102,550	$	7,387	$	95,163

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Dec. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock-Based Compensation Expense	A summary of stock-based compensation expense, by functional line item in the condensed consolidated statements of income, is as follows:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(In thousands)
	Cost of revenues	$	258	$	259	$	871	$	1,082
	Engineering and development		2,243		2,462		7,523		9,070
	Sales and marketing		1,182		1,251		3,265		4,274
	General and administrative		1,220		1,086		3,519		3,621
		$	4,903	$	5,058	$	15,178	$	18,047

Special_Charges_Tables

Special Charges (Tables)	9 Months Ended
	Dec. 28, 2014
Summary of Special Charges	A summary of the special charges recorded during the three and nine months ended December 28, 2014 and December 29, 2013, respectively, is as follows:
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(In thousands)
	Exit costs	$	69		$	1,947		$	3,361		$	15,900
	Asset impairments		—			—			1,011			2,429
	Other charges		—			—			500			—
		$	69		$	1,947		$	4,872		$	18,329
March 2014 Initiative [Member]
Activity and Liability Balances for Exit Costs	Activity and liability balances for exit costs related to the March 2014 Initiative are as follows:
		Workforce			Contract			Total
		Reduction			Cancellation
					and Other
		(In thousands)
	Balance as of March 30, 2014	$	3,177		$	4,311		$	7,488
	Charged to costs and expenses		2,693			(73	)		2,620
	Payments		(5,870	)		(4,238	)		(10,108	)
	Balance as of December 28, 2014	$	—		$	—		$	—
June 2013 Initiative [Member]
Activity and Liability Balances for Exit Costs	Activity and liability balances for exit costs related to the June 2013 Initiative are as follows:
		Workforce			Facilities			Total
		Reduction			and Other
		(In thousands)
	Balance as of March 30, 2014	$	3,528		$	4,621		$	8,149
	Charged to costs and expenses		741			—			741
	Payments		(1,798	)		(837	)		(2,635	)
	Balance as of December 28, 2014	$	2,471		$	3,784		$	6,255

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	9 Months Ended
	Dec. 28, 2014
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income Per Share	The following table sets forth the computation of basic and diluted net income per share:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(In thousands, except per share amounts)
	Net income	$	22,435	$	20,586	$	39,445	$	28,513
	Shares:
	Weighted-average shares outstanding — basic		87,728		86,855		87,679		87,810
	Dilutive potential common shares, using treasury stock method		799		331		615		399
	Weighted-average shares outstanding — diluted		88,527		87,186		88,294		88,209
	Net income per share:
	Basic	$	0.26	$	0.24	$	0.45	$	0.32
	Diluted	$	0.25	$	0.24	$	0.45	$	0.32

Business_Acquisition_Additiona

Business Acquisition - Additional Information (Detail) (Broadcom 10/40/100Gb Ethernet Business [Member], USD $)	1 Months Ended	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2014	Dec. 28, 2014
Business Acquisition [Line Items]
Business acquisition, cash consideration	$147.80
Business combination adjustment to property and equipment			1.6
Business combination adjustment to identifiable intangible assets		25.3	25.3
Estimated percentage of project complete	40.00%
Estimated remaining cost to complete project	6
Estimated remaining time to complete project	2 years
Property and Equipment [Member]
Business Acquisition [Line Items]
Business combination adjustment to goodwill			-1.6
Identifiable Intangible Assets [Member]
Business Acquisition [Line Items]
Business combination adjustment to goodwill		($25.30)	($25.30)
Minimum [Member]
Business Acquisition [Line Items]
Risk adjusted discount rates	14.50%
Maximum [Member]
Business Acquisition [Line Items]
Risk adjusted discount rates	17.00%

Business_Acquisition_Summary_o

Business Acquisition - Summary of Final Purchase Price Allocation (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$167,232	$167,232
Broadcom 10/40/100Gb Ethernet Business [Member]
Business Acquisition [Line Items]
Inventories		2,880
Other current assets		307
Property and equipment		4,070
Goodwill		56,256
Identifiable intangible assets		85,360
Accrued compensation		-987
Other current liabilities		-129
Total purchase price		$147,757

Business_Acquisition_Summary_o1

Business Acquisition - Summary of Identifiable Intangible Assets Acquired and Estimated Useful Lives (Detail) (Broadcom 10/40/100Gb Ethernet Business [Member], USD $)	1 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014
Business Acquisition [Line Items]
Total	$85,360
Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
In-process research and development	21,200
Total	85,360
Developed Technology [Member] | Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
Identifiable intangible Assets, Weighted Average Useful Lives (Years)	5 years
Intangible Assets	58,760
Customer Relationships [Member] | Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
Identifiable intangible Assets, Weighted Average Useful Lives (Years)	8 years
Intangible Assets	$5,400

Marketable_Securities_Schedule

Marketable Securities - Schedule of Available-for-Sale Securities (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	$192,607	$186,568
Available-for-sale securities, Gross Unrealized Gains	286	543
Available-for-sale securities, Gross Unrealized Losses	-469	-328
Available-for-sale securities, Estimated Fair Value	192,424	186,783
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	44,077	49,237
Available-for-sale securities, Gross Unrealized Gains	11	16
Available-for-sale securities, Gross Unrealized Losses	-53	-55
Available-for-sale securities, Estimated Fair Value	44,035	49,198
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	89,843	74,386
Available-for-sale securities, Gross Unrealized Gains	51	200
Available-for-sale securities, Gross Unrealized Losses	-287	-72
Available-for-sale securities, Estimated Fair Value	89,607	74,514
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	30,573	32,778
Available-for-sale securities, Gross Unrealized Gains	155	191
Available-for-sale securities, Gross Unrealized Losses	-95	-187
Available-for-sale securities, Estimated Fair Value	30,633	32,782
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	7,951	5,178
Available-for-sale securities, Gross Unrealized Gains	1	3
Available-for-sale securities, Gross Unrealized Losses	-14	-5
Available-for-sale securities, Estimated Fair Value	7,938	5,176
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	20,163	24,989
Available-for-sale securities, Gross Unrealized Gains	68	133
Available-for-sale securities, Gross Unrealized Losses	-20	-9
Available-for-sale securities, Estimated Fair Value	$20,211	$25,113

Marketable_Securities_Schedule1

Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Debt Securities (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	$18,047
Due after one year through three years, Amortized Cost	144,154
Due after three years through five years, Amortized Cost	11,586
Due after five years, Amortized Cost	18,820
Available-for-sale securities, Amortized Cost	192,607	186,568
Due in one year or less, Estimated Fair Value	18,054
Due after one year through three years, Estimated Fair Value	143,896
Due after three years through five years, Estimated Fair Value	11,569
Due after five years, Estimated Fair Value	18,905
Total estimated fair value of debt securities	$192,424	$186,783

Marketable_Securities_Schedule2

Marketable Securities - Schedule of Unrealized Losses by Investment Category (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	$116,653	$64,323
Unrealized Losses of Less Than 12 Months	-403	-286
Fair Value of 12 Months or Greater	6,088	2,838
Unrealized Losses of 12 Months or Greater	-66	-42
Fair Value, Total	122,741	67,161
Unrealized Losses, Total	-469	-328
U.S. Government and Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	31,711	26,879
Unrealized Losses of Less Than 12 Months	-53	-55
Fair Value, Total	31,711	26,879
Unrealized Losses, Total	-53	-55
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	65,215	19,906
Unrealized Losses of Less Than 12 Months	-287	-72
Fair Value, Total	65,215	19,906
Unrealized Losses, Total	-287	-72
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	7,554	11,261
Unrealized Losses of Less Than 12 Months	-29	-145
Fair Value of 12 Months or Greater	6,088	2,838
Unrealized Losses of 12 Months or Greater	-66	-42
Fair Value, Total	13,642	14,099
Unrealized Losses, Total	-95	-187
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	6,062	2,955
Unrealized Losses of Less Than 12 Months	-14	-5
Fair Value, Total	6,062	2,955
Unrealized Losses, Total	-14	-5
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of Less Than 12 Months	6,111	3,322
Unrealized Losses of Less Than 12 Months	-20	-9
Fair Value, Total	6,111	3,322
Unrealized Losses, Total	($20)	($9)

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on a Recurring Basis (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$192,424	$186,783
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	95,508	91,258
Marketable securities	192,424	186,783
Total assets at fair value disclosure	287,932	278,041
Fair Value Measurements Using, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	95,508	91,258
Marketable securities	44,035	49,198
Total assets at fair value disclosure	139,543	140,456
Fair Value Measurements Using, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	148,389	137,585
Total assets at fair value disclosure	148,389	137,585
U.S. Government and Agency Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	44,035	49,198
U.S. Government and Agency Securities [Member] | Fair Value Measurements Using, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	44,035	49,198
Corporate Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	89,607	74,514
Corporate Debt Obligations [Member] | Fair Value Measurements Using, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	89,607	74,514
Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	30,633	32,782
Mortgage-Backed Securities [Member] | Fair Value Measurements Using, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	30,633	32,782
Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	7,938	5,176
Other Debt Securities [Member] | Fair Value Measurements Using, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	7,938	5,176
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	20,211	25,113
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	20,211	25,113
Municipal Bonds [Member] | Fair Value Measurements Using, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$20,211	$25,113

Inventories_Components_of_Inve

Inventories - Components of Inventories (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials	$1,974	$2,041
Finished goods	28,965	15,995
Total Inventory	$30,939	$18,036

Purchased_Intangible_Assets_Co

Purchased Intangible Assets - Components of Purchased Intangible Assets (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Schedule of Acquired Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]
In-process research and development, gross carrying value and net carrying value	$21,200	$21,200
Purchased intangible assets, gross carrying value	102,550	102,550
Purchased intangible assets, accumulated amortization	20,459	7,387
Purchased intangible assets, net carrying value	82,091	95,163
Developed Technology [Member]
Schedule of Acquired Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]
Purchased finite-lived intangible assets, gross carrying value	72,121	72,121
Purchased intangible assets, accumulated amortization	17,323	4,957
Purchased finite-lived intangible assets, net carrying value	54,798	67,164
Customer Relationships [Member]
Schedule of Acquired Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]
Purchased finite-lived intangible assets, gross carrying value	5,400	5,400
Purchased intangible assets, accumulated amortization	534
Purchased finite-lived intangible assets, net carrying value	4,866	5,400
Other [Member]
Schedule of Acquired Finite and Indefinite Lived Intangible Assets by Major Class [Line Items]
Purchased finite-lived intangible assets, gross carrying value	3,829	3,829
Purchased intangible assets, accumulated amortization	2,602	2,430
Purchased finite-lived intangible assets, net carrying value	$1,227	$1,399

Treasury_Stock_Additional_info

Treasury Stock - Additional information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Oct. 27, 2014	Dec. 28, 2014	Mar. 30, 2014
Equity [Abstract]
Maximum value of outstanding common stock authorized for repurchase	$100,000,000
Outstanding common stock repurchase, maximum period	18 months
Purchase of common stock		1,000,000
Aggregate purchase price paid for common stock		11,800,000
Purchase of common stock under repurchase programs, shares		127,633,000	126,616,000
Treasury stock, at cost		$1,949,136,000	$1,937,302,000

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted stock units granted, shares	2.2
Weighted average grant date fair value per share, restricted stock units granted	$10.26

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$4,903	$5,058	$15,178	$18,047
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	258	259	871	1,082
Engineering and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,243	2,462	7,523	9,070
Sales and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,182	1,251	3,265	4,274
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$1,220	$1,086	$3,519	$3,621

Special_Charges_Summary_of_Spe

Special Charges - Summary of Special Charges (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Restructuring and Related Activities [Abstract]
Exit costs	$69	$1,947	$3,361	$15,900
Asset impairments			1,011	2,429
Other charges			500
Special charges	$69	$1,947	$4,872	$18,329

Special_Charges_Additional_Inf

Special Charges - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Restructuring Cost and Reserve [Line Items]
Special charges	$69,000	$1,947,000	$4,872,000	$18,329,000
Exit costs	69,000	1,947,000	3,361,000	15,900,000
Asset impairment charges			1,011,000	2,429,000
Unpaid exit costs included in current liabilities	1,500,000		1,500,000
Unpaid exit costs included in other liabilities	4,800,000		4,800,000
March 2014 Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Date the company commenced the restructuring plan			17-Mar-14
Date the company completed the restructuring activities			28-Dec-14
Special charges			3,600,000
Exit costs			2,620,000
Asset impairment charges			1,011,000
Aggregate amount of exit costs	11,700,000		11,700,000
March 2014 Initiative [Member] | Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs			2,693,000
Aggregate amount of exit costs	7,500,000		7,500,000
March 2014 Initiative [Member] | Contract Cancellation and Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs			-73,000
Aggregate amount of exit costs	4,200,000		4,200,000
June 2013 Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Date the company commenced the restructuring plan			3-Jun-13
Special charges	100,000		700,000
Exit costs	100,000		741,000
Aggregate amount of exit costs	18,100,000		18,100,000
Additional severance costs	1,000,000		1,000,000
June 2013 Initiative [Member] | Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs			741,000
Aggregate amount of exit costs	14,600,000		14,600,000
June 2013 Initiative [Member] | Facilities and Other [Member]
Restructuring Cost and Reserve [Line Items]
Aggregate amount of exit costs	$3,500,000		$3,500,000

Special_Charges_Activity_and_L

Special Charges - Activity and Liability Balances for Exit Costs (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Restructuring Cost and Reserve [Line Items]
Charged to costs and expenses	$69	$1,947	$3,361	$15,900
March 2014 Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			7,488
Charged to costs and expenses			2,620
Payments			-10,108
Ending Balance	0		0
March 2014 Initiative [Member] | Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			3,177
Charged to costs and expenses			2,693
Payments			-5,870
Ending Balance	0		0
March 2014 Initiative [Member] | Contract Cancellation and Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			4,311
Charged to costs and expenses			-73
Payments			-4,238
Ending Balance	0		0
June 2013 Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			8,149
Charged to costs and expenses	100		741
Payments			-2,635
Ending Balance	6,255		6,255
June 2013 Initiative [Member] | Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			3,528
Charged to costs and expenses			741
Payments			-1,798
Ending Balance	2,471		2,471
June 2013 Initiative [Member] | Facilities and Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			4,621
Payments			-837
Ending Balance	$3,784		$3,784

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Taxes [Line Items]
Provision for income taxes	$996,000	$686,000	$3,341,000	$3,668,000
Retroactive reinstatement of the federal research tax credit	$3,700,000		$3,700,000
Internal Revenue Service [Member] | Tax Year 2010 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2010
Internal Revenue Service [Member] | Tax Year 2011 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2011
Internal Revenue Service [Member] | Tax Year 2012 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2012

Net_Income_Per_Share_Computati

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Earnings Per Share [Abstract]
Net income	$22,435	$20,586	$39,445	$28,513
Shares:
Weighted-average shares outstanding - basic	87,728	86,855	87,679	87,810
Dilutive potential common shares, using treasury stock method	799	331	615	399
Weighted-average shares outstanding - diluted	88,527	87,186	88,294	88,209
Net income per share:
Basic	$0.26	$0.24	$0.45	$0.32
Diluted	$0.25	$0.24	$0.45	$0.32

Net_Income_Per_Share_Additiona

Net Income Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Earnings Per Share [Abstract]
Stock-based awards excluded from the diluted per share calculations	8.9	12.1	10.7	14.8