InvenSense 10-Q 12 Feb 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Dec. 29, 2013	Jan. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	29-Dec-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'InvenSense Inc	'
Entity Central Index Key	'0001294924	'
Current Fiscal Year End Date	'--03-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	87,811,046

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$41,127	$100,843
Short-term investments	55,056	77,040
Accounts receivable	34,779	30,098
Inventories	58,512	23,762
Prepaid expenses and other current assets	18,109	13,302
Total current assets	207,583	245,045
Property and equipment, net	23,655	8,650
Intangible assets, net	36,598	'
Goodwill	51,098	'
Long-term investments	170,100	22,442
Other assets	5,040	2,957
Total assets	494,074	279,094
Current liabilities:	'	'
Accounts payable	11,476	14,464
Accrued liabilities	29,724	7,753
Total current liabilities	41,200	22,217
Long-term debt	133,810	'
Other long-term liabilities	10,612	6,930
Total liabilities	185,622	29,147
Commitments and contingencies (Note 4)	'	'
Preferred stock:	'	'
Preferred stock, $0.001 par value - 20,000 shares authorized, no shares issued and outstanding at December 29, 2013 and March 31, 2013	'	'
Common stock:	'	'
Common stock, $0.001 par value - 750,000 shares authorized, 87,531 shares issued and outstanding at December 29, 2013, 84,980 shares issued and outstanding at March 31, 2013	205,047	158,108
Accumulated other comprehensive income (loss)	-135	50
Retained earnings	103,540	91,789
Total stockholders' equity	308,452	249,947
Total liabilities and stockholders' equity	$494,074	$279,094

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	20,000	20,000
Preferred stock, shares issued	'	'
Preferred stock, shares outstanding	'	'
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	750,000	750,000
Common stock, shares issued	87,531	84,980
Common stock, shares outstanding	87,531	84,980

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Income Statement [Abstract]	'	'	'	'
Net revenue	$66,684	$58,929	$193,534	$153,424
Cost of revenue	35,094	27,723	96,050	70,284
Gross profit	31,590	31,206	97,484	83,140
Operating expenses:	'	'	'	'
Research and development	14,522	6,712	32,446	18,285
Selling, general and administrative	15,663	8,428	36,243	21,887
Litigation settlement	14,500	'	14,500	'
Total operating expenses	44,685	15,140	83,189	40,172
Income (loss) from operations	-13,095	16,066	14,295	42,968
Other income (expense), net	-1,683	98	-1,390	188
Income (loss) before income taxes	-14,778	16,164	12,905	43,156
Income tax expense (benefit)	-2,599	-654	1,154	5,023
Net income (loss)	($12,179)	$16,818	$11,751	$38,133
Net income (loss) per share:	'	'	'	'
Basic	($0.14)	$0.20	$0.14	$0.46
Diluted	($0.14)	$0.19	$0.13	$0.44
Weighted average shares outstanding used in computing net income (loss) per share:	'	'	'	'
Basic	87,047	83,218	86,145	82,280
Diluted	87,047	87,350	89,364	87,232

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	($12,179)	$16,818	$11,751	$38,133
Other comprehensive income (loss):	'	'	'	'
Unrealized gain (loss) on available-for-sale investments, net of tax	-94	-22	-185	62
Total comprehensive income (loss)	($12,273)	$16,796	$11,566	$38,195

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Cash flows from operating activities:	'	'
Net income	$11,751	$38,133
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	3,762	1,480
Stock-based compensation expense	10,896	6,449
Deferred income tax assets	1	114
Tax effect of employee benefit plans	3,231	3,818
Excess tax benefit from stock-based compensation	-3,231	-3,818
Non-cash interest expense	1,069	'
Changes in operating assets and liabilities net of effect of business acquired:	'	'
Accounts receivable	-4,681	-12,593
Inventories	-29,643	-6,560
Prepaid expenses and other current assets	-2,547	-3,911
Other assets	-1,400	1,871
Accounts payable	-2,341	2,933
Accrued liabilities	24,926	3,391
Net cash provided by operating activities	11,793	31,307
Cash flows from investing activities:	'	'
Acquisition of a business	-99,324	'
Purchase of property and equipment	-14,682	-4,071
Sale and maturities of available-for-sale investments	63,145	10,509
Purchase of available-for-sale investments	-189,106	-104,820
Net cash used in investing activities	-239,967	-98,382
Cash flows from financing activities:	'	'
Proceeds from debt issuances	169,750	'
Payment for convertible note hedge	-39,118	'
Proceeds from exercise of warrants	'	81
Proceeds from exercise of common stock	9,983	4,064
Proceeds from sale of warrant	25,643	'
Offering costs	'	-471
Payments of long-term debt and capital lease obligations	-8	-21
Repurchases of restricted stock for taxes	-1,023	'
Excess tax benefit from stock-based compensation	3,231	3,818
Net cash provided by financing activities	168,458	7,471
Net decrease in cash and cash equivalents	-59,716	-59,604
Cash and cash equivalents:	'	'
Beginning of period	100,843	153,643
End of period	41,127	94,039
Supplemental disclosures of cash flow information:	'	'
Net cash paid for income taxes	166	31
Noncash investing and financing activities:	'	'
Unpaid purchases of property and equipment	1,444	371
Unrealized gain from available-for-sale investments	260	62
Non-cash warrant exercises	90	70
Unpaid debt issuance cost	491	'
Proceeds from exercise of common stock not received	$43	'

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	9 Months Ended
	Dec. 29, 2013
Accounting Policies [Abstract]	'
Organization and Summary of Significant Accounting Policies	'
	1. Organization and Summary of Significant Accounting Policies
	Business
	InvenSense, Inc. (“the Company”) was incorporated in California in June 2003 and reincorporated in Delaware in January 2004. The Company designs, develops, markets and sells MEMS sensors, such as accelerometers, gyroscopes and microphones for consumer electronics, and is dedicated to bringing the best-in-class size, performance and cost solutions to market. Targeting applications in smartphones and tablets, console and portable video gaming devices, digital still and video cameras, smart TVs (including digital set-top boxes, televisions and multi-media HDDs), navigation devices, toys, and health and fitness accessories, the Company delivers leading solutions based on its advanced multi-axis technology.
	These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto for the fiscal year ended March 31, 2013 included in the Company’s Annual Report on Form 10-K filed on June 14, 2013 with the Securities and Exchange Commission (“SEC”). No material changes have been made to the Company’s significant accounting policies since the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2013.
	Certain Significant Business Risks and Uncertainties
	The Company participates in the high-technology industry and believes that adverse changes in any of the following areas could have a material effect on the Company’s future financial position, results of operations, or cash flows: reliance on a limited number of primary customers to support the Company’s revenue generating activities; advances and trends in new technologies and industry standards; market acceptance of the Company’s products; development of sales channels; strategic relationships, including key component suppliers; litigation or claims against the Company based on intellectual property, patent, product, regulatory, or other factors; and the Company’s ability to attract and retain employees necessary to support its growth.
	Fiscal Year
	The Company’s fiscal year is a 52 or 53 week period ending on the Sunday closest to March 31. The Company’s most recent completed fiscal year (“Fiscal 2013”) ended on March 31, 2013 (“March 2013”). The third fiscal quarter in each of the two most recent fiscal years ended on December 29, 2013 (“three months ended December 29, 2013” or “December 2013”) and December 30, 2012 (“three months ended December 30, 2012” or “December 2012”), respectively, and each third fiscal quarter period included 13 weeks.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.
	The condensed consolidated balance sheet as of March 31, 2013, included herein was derived from the audited financial statements as of that date, but does not include all disclosures required by GAAP. The unaudited interim condensed consolidated financial statements, in the opinion of management, reflect all normal recurring adjustments necessary to present fairly the Company’s financial position, results of operations, comprehensive income and cash flows for the interim periods. The results of operations for the period ended December 29, 2013 is not necessarily indicative of the results to be expected for the fiscal year ending March 30, 2014 or for any future year or interim period.
	Basis of Consolidation
	All intercompany transactions and balances have been eliminated upon consolidation. The functional currency of each of the Company’s subsidiaries is the U.S. dollar. Foreign currency gains or losses are recorded as “Other income (expense), net” in the condensed consolidated statements of income.
	Use of Estimates
	The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Significant estimates included in the condensed consolidated financial statements and related notes include income taxes, inventory valuation, stock-based compensation, loss contingencies and warranty reserves. These estimates are based upon information available as of the date of the consolidated financial statements, and actual results could differ from those estimates.
	Concentration of Credit Risk
	At December 29, 2013, three customers each accounted for 25%, 23% and 12% of total accounts receivable. At December 30, 2012, four customers each accounted for 17%, 16%, 14% and 14% of total accounts receivable.
	For the three months ended December 29, 2013, three customers each accounted for 32%, 16% and 10% of total net revenue. For the nine months ended December 29, 2013, one customer accounted for 32% of total net revenue. For the three months ended December 30, 2012, three customers each accounted for 24%, 22% and 10% of total net revenue. For the nine months ended December 30, 2012, three customers each accounted for 23%, 20% and 13% of total net revenue.
	Warranty
	The Company’s warranty agreements are contract and component specific and can be up to three years for selected components. The Company’s accrual for anticipated warranty costs has declined, primarily due to a decline in the historical volume of product returned under the warranty program. The accrual also includes management’s judgment regarding anticipated rates of warranty claims and associated repair costs. The following table summarizes the activity related to the product warranty liability during the nine months ended December 29, 2013 and December 30, 2012:
		Nine months Ended
		December 29, 2013			December 30, 2012
		(in thousands)
	Beginning balance	$	123		$	361
	(Decrease) increase in provision for warranty		(4	)		(199	)
	Less: actual warranty costs		(30	)		(32	)
	Ending balance	$	89		$	130
	Net Income (Loss) Per Share
	Basic net income (loss) per share is computed by dividing net income by the weighted average number of shares outstanding during the period, which excludes dilutive unvested restricted stock.
	Diluted net income (loss) per share is computed by dividing net income by the weighted average number of shares outstanding, including unvested restricted stock, certain warrants to purchase common stock and potential dilutive shares from the dilutive effect of outstanding stock options using the treasury stock method. Diluted net loss per share is equal to basic net loss per share as potentially dilutive securities are anit-dilutive due to the net loss.
	The following table presents the calculation of basic and diluted net income per share:
		Three Months Ended						Nine months Ended
		December 29, 2013			December 30, 2012			December 29, 2013		December 30, 2012
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted:
	Net income (loss)	$	(12,179	)	$	16,818		$	11,751	$	38,133
	Denominator:
	Basic shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Diluted shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		—			3,964			3,165		4,765
	Common stock warrants		—			168			54		187
	Weighted average shares used in computing diluted net income (loss) per share		87,047			87,350			89,364		87,232
	Net income (loss) per share:
	Basic	$	(0.14	)	$	0.2		$	0.14	$	0.46
	Diluted	$	(0.14	)	$	0.19		$	0.13	$	0.44
	The following summarizes the potentially dilutive securities outstanding at the end of each period that were excluded from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive:
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,		December 30,
		2013			2012			2013		2012
		(in thousands)
	Employee stock options		9,016			3,423			2,922		4,004
	Unvested restricted stock units		2,369			590			830		152
	Total antidilutive securities		11,385			4,013			3,752		4,156
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, “Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” that will require the presentation of certain unrecognized tax benefits as reductions to deferred tax assets rather than as liabilities in our Condensed Consolidated Balance Sheets when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This standard is effective for fiscal years beginning on or after December 15, 2013, and for interim periods within those fiscal years which will be the Company’s fiscal year 2015. The Company is currently evaluating the impact of this new standard on its Condensed Consolidated Financial Statements.
	In February 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” which adds new disclosure requirements for items reclassified out of accumulated other comprehensive income. ASU No. 2011-02 became effective for fiscal years, and interim periods within those years, beginning after December 15, 2012, which is the Company’s fiscal interim period ended June 30, 2013 of fiscal year ending March 30, 2014, and the adoption did not impact the Company’s financial condition or results of operations.

Cash_Equivalents_and_Available

Cash Equivalents and Available-for-sale Investments	9 Months Ended
	Dec. 29, 2013
Cash And Cash Equivalents [Abstract]	'
Cash Equivalents and Available-for-sale Investments	'
	2. Cash Equivalents and Available-for-sale Investments
	At December 29, 2013, of the $41.1 million of the Company’s cash and cash equivalents, $14.2 million was cash and $26.9 million was cash equivalents invested in money market funds and commercial paper. At December 29, 2013, $12.9 million of the $41.1 million of cash and cash equivalents were held by our foreign subsidiaries. Additionally, as of December 29, 2013, the Company had short-term available-for-sale investments of $55.1 million and long-term available-for-sale investments of $170.1 million, totaling $225.2 million. Long-term investments as of December 29, 2013 of $170.1 million had scheduled maturities between one and five years from the balance sheet date.
	At March 2013, of the $100.8 million of the Company’s cash and cash equivalents, $77.9 million was cash and $22.9 million was cash equivalents invested in money market funds. At March 2013, $60.7 million of the $100.8 million of cash and cash equivalents were held by our foreign subsidiaries. Additionally, as of March 2013, the Company had short-term available-for-sale investments of $77.0 million and long-term available-for-sale investments of $22.4 million, totaling $99.4 million. Long-term investments as of March 2013 of $22.4 million had scheduled maturities between one and five years from the balance sheet date.
	The Company applies the provisions of ASC 820-10, “Fair Value Measurements”. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. ASC 820-10 requires disclosure that establishes a framework for measuring fair value and expands disclosure about fair value measurements. The standard describes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The inputs for the first two levels are considered observable and the last is unobservable and include the following:
	Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2—Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or
	Level 3—Unobservable inputs in which there is little or no market data, and as a result, prices or valuation techniques are employed that require inputs that are significant to the fair value measurement.
	This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. On a recurring basis, the Company measures certain financial assets and liabilities at fair value. The fair values of our money market funds were derived from quoted market prices as active markets for these instruments exist. The Company chose not to elect the fair value option as prescribed by ASC 825-10-05 “Fair Value Option” for its financial assets and liabilities that had not been previously carried at fair value. Therefore, financial assets and liabilities not carried at fair value, such as accounts payable, are still reported at their carrying values.
	Fair value measurements at each reporting date were as follows:
	December 2013:
	Assets measured at fair value on a recurring basis were presented in the Company’s condensed consolidated balance sheet as of December 29, 2013.
		December 2013		Quoted Prices		Significant			Significant
		Balance		in Active		Other			Other
				Markets for		Observable			Unobservable
				Identical		Inputs			Inputs
				Assets Level 1		Level 2			Level 3
		(in thousands)
	Investment Class
	Money Market Funds	$	26,913	$	26,913	$	—		$	—
	Corporate Notes and Bonds		212,245		—		212,245			—
	Commercial Paper		8,979		—		8,979			—
	Municipal Notes and Bonds		3,933		—		3,933			—
	Total	$	252,070	$	26,913	$	225,157		$	—
	Financial Statement Classification
	Cash equivalents	$	26,913	$	26,913	$	—		$	—
	Short-term investments		55,057		—		55,057			—
	Long-term investments		170,100		—		170,100			—
	Total	$	252,070	$	26,913	$	225,157		$	—
		Dec-13		Gross		Gross			Dec-13
		Amortized Cost		Unrealized		Unrealized			Estimated FMV
				Gain		Loss
	Investment Class
	Corporate Notes and Bonds and Municipal Notes and Bonds	$	212,401	$	—	$	(156	)	$	212,245
	Commercial Paper		8,980		—		(1	)		8,979
	Municipal Notes and Bonds		3,927		6		—			3,933
	Total Available-for-sale investments	$	225,308	$	6	$	(157	)	$	225,157
	Cash equivalents									26,913
	Total Aggregate Fair Value								$	252,070
	The fair values of money market funds were derived from quoted market prices as active markets for these instruments exist. The fair values of corporate notes and bonds, municipal notes and bonds and U.S. Agency Securities were derived from non-binding market consensus prices that are corroborated by observable market data.
	There were no transfers of assets measured at fair value between Level 1 and Level 2 during the three months ended December 29, 2013.
	March 2013:
	Assets measured at fair value on a recurring basis were presented in the Company’s consolidated balance sheet as of March 31, 2013.
		March 2013		Quoted Prices		Significant			Significant
		Balance		in Active		Other			Other
				Markets for		Observable			Unobservable
				Identical		Inputs			Inputs
				Assets Level 1		Level 2			Level 3
		(in thousands)
	Investment Class
	Money Market Funds	$	22,860	$	22,860	$	—		$	—
	Corporate Notes and Bonds		94,485		—		94,485			—
	Commercial Paper		2,998		—		2,998			—
	U.S. Agency Securities		1,999		—		1,999			—
	Total	$	122,342	$	22,860	$	99,482		$	—
	Financial Statement Classification
	Cash equivalents	$	22,860	$	22,860	$	—		$	—
	Short-term investments		77,040		—		77,040			—
	Long-term investments		22,442		—		22,442			—
	Total	$	122,342	$	22,860	$	99,482		$	—
		Mar-13		Gross		Gross			Mar-13
		Amortized Cost		Unrealized		Unrealized			Estimated FMV
				Gain		Loss
	Investment Class
Corporate Notes and Bonds	$	94,407	$	78	$	—		$	94,485
Commercial Paper		2,997		1		—			2,998
U.S. Agency Securities		2,001		—		(2	)		1,999
Total Available-for-sale investments	$	99,405	$	79	$	(2	)	$	99,482
Cash equivalents									22,860
Total Aggregate Fair Value								$	122,342
There were no transfers of assets measured at fair value between Level 1 and Level 2 during Fiscal 2013.

Balance_Sheet_Details

Balance Sheet Details	9 Months Ended
	Dec. 29, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Balance Sheet Details	'
	3. Balance Sheet Details
	Inventories
	Inventories at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Work in progress		$	43,396		$	18,803
	Finished goods			15,116			4,959
	Total inventories		$	58,512		$	23,762
	Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Tax receivable		$	6,334		$	6,374
	Other receivable			2,930			87
	Prepaid expenses			2,594			2,209
	Deferred tax assets			1,035			951
	Other current assets			1,863			857
	Advance to and receivable from vendors			3,353			2,824
	Total prepaid expenses and other current assets		$	18,109		$	13,302
	The Company has agreements with foundry vendors to facilitate and expand production and development capacity for the Company’s products. Certain of these agreements require advance payments to these foundry vendors, which are applied at agreed upon rates to subsequent wafer purchases from these vendors. The Company classifies advances expected to be applied towards purchases within 12 months as “Prepaid expenses and other current assets” and the remaining balances as “Other assets” on the Company’s condensed consolidated balance sheets. The Company believes that the advances to these vendors will be fully applied towards future purchases from these vendors. The Company made advance payments of $nil and $0.8 million to foundry vendors during the three and nine months ended December 29, 2013, respectively. The Company made no advance payments to foundry vendors during the three and nine months ended December 30, 2012.
	Property and Equipment
	Property and equipment at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Production and lab equipment		$	22,895		$	11,654
	Computer equipment and software			3,483			1,124
	Equipment under construction			4,810			1,851
	Leasehold improvements and furniture and fixtures			2,263			923
	Subtotal		$	33,451		$	15,552
	Accumulated depreciation and amortization			(9,796	)		(6,902	)
	Property and equipment—net		$	23,655		$	8,650
	Depreciation and amortization expense for the three and nine months ended December 29, 2013 was $2.2 million and $3.8 million, respectively. Depreciation and amortization expense for the three and nine months ended December 30, 2012 was $0.3 million and $1.5 million, respectively. Equipment under construction consists primarily of production and lab equipment. Equipment under construction is not subject to depreciation until it is available for its intended use. All of the equipment under construction is expected to be completed and placed in service by the end of fiscal 2014. Capitalized leases consist of office equipment. For the three and nine months ended December 29, 2013 and December 30, 2012, there were no new capitalized leases.
	Accrued Liabilities
	Accrued liabilities at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Litigation settlement		$	14,500		$	—
	Payroll-related expenses			4,283			2,777
	Legal fees			3,245			884
	Other accrued liabilities			3,541			819
	Bonuses			1,874			2,120
	Accrued acquisition related costs			1,289			—
	Accrued interest payable			384			—
	Former CEO separation costs (1)			184			828
	Engineering services			293			106
	Warranty reserves			89			123
	Income tax payable			42			96
	Total accrued liabilities		$	29,724		$	7,753
	-1	During the third quarter of fiscal year 2013, the Company’s founder and CEO resigned. Under the terms of his employment agreement, he will receive severance payments totaling $828,000 through the end of fiscal year 2014.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Dec. 29, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	4. Commitments and Contingencies
	Operating Lease Obligations
	The Company has non-cancelable operating leases for its facilities through fiscal year 2020.
	Future minimum lease payments under operating leases as of December 29, 2013 are as follows:
	Fiscal Years Ending:	Amount
		(in thousands)
	2014 (remainder)	$	649
	2015		3,124
	2016		3,820
	2017		3,967
	2018		3,961
	Beyond		6,926
	Total	$	22,447
	The Company’s lease agreements provide for rental payments which have certain lease incentives and graduated rental payments. As a result, the rent expense is recognized on a straight-line basis over the term of the lease. The Company’s rental expense under operating leases was approximately $1.6 million and $3.4 million for the three and nine months ended December 29, 2013, respectively. The Company’s rental expense under operating leases was approximately $0.5 million and $1.5 million for the three and nine months ended December 30, 2012, respectively.
	401(k) Savings Plan
	In November 2004, the Company established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pretax basis. The Company contributions to the plan may be made at the discretion of the Board of Directors. To date, no contributions have been made to the plan by the Company.

Convertible_Senior_Notes

Convertible Senior Notes	9 Months Ended
	Dec. 29, 2013
Debt Disclosure [Abstract]	'
Convertible Senior Notes	'
	5. Convertible Senior Notes
	On November 6, 2013, the Company issued $150.0 million aggregate principal amount of 1.75% Convertible Senior Notes due on November 1, 2018 (the “Notes”), in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933 (the “Securities Act”). The Company also granted the initial purchaser of the Notes an option to purchase up to an additional $25 million aggregate principal amount of the Notes, which the initial purchaser exercised on November 7, 2013. The Notes offered have not been registered under the Securities Act, or applicable state securities laws or blue sky laws, and may not be offered or sold in the United States absent registration under the Securities Act and applicable state securities laws or available exemptions from the registration requirements.
	The Notes are senior unsecured obligation of the Company and rank equally in right of payment with all of the Company’s existing and future senior unsecured indebtedness and are junior to any of the Company’s existing and future secured indebtedness. The Notes pay interest in cash semi-annually (May and November) at a rate of 1.75% per annum. Net proceeds received by the Company, after issuance costs, were approximately $169.8 million. Issuance costs in the amount of $0.5 million were accrued but will be paid in the following quarter.
	On or after August 1, 2018 until the maturity date, the Notes may be converted at the option of the holders. Holders may convert the Notes at their option prior to August 1, 2018 only under the following circumstances:
	1) During any calendar quarter commencing after the calendar quarter ending on March 31, 2014 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;
	2) During the five business day period after any five consecutive trading day period in which the “trading price” per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day; or
	3) Upon the occurrence of specified corporate events, including if there is a fundamental change.
	Upon conversion, the Company will pay cash up to the aggregate principal amount of the notes to be converted and pay or deliver cash, shares of its own common stock or a combination of cash and shares of its own common stock, at the Company’s election, in respect of the remainder, if any, of its conversion obligation in excess of the aggregate principal amount of the notes being converted.
	The conversion rate is initially 45.683 shares per $1,000 principal amount of the Notes (equivalent to an initial conversion price of approximately $21.89 per share of common stock), subject to certain adjustments.
	The Notes are not redeemable by the Company prior to the maturity date. At the event of default or fundamental change, the principal amount of the notes plus accrued and unpaid interest may become due immediately at the Note holders’ option.
	The Company used and plans to use the net proceeds of approximately $169.8 million from the offering of the Notes (after the issuance costs) for general corporate purposes, including to replace cash used to purchase the MEMS Microphone business line of Analog Devices, Inc. (see Note 8), for the cost of the Note hedge transactions (see below) and for capital expenditures and working capital. However, the Company has not designated with certainty all of the particular uses for the net proceeds from the Notes.
	The Company separately accounts for the liability and equity components of the Notes. The initial debt component of the Notes was valued at $135.7 million based on the contractual cash flows discounted at an appropriate comparable market non-convertible debt borrowing rate at the date of issuance of 7.3%, with the equity component representing the residual amount of the proceeds of $39.3 million which was recorded as a debt discount. The issuance costs were allocated pro-rata based on the relative initial carrying amounts of the debt and equity components, including the Note hedges and warrants transactions described below. As a result, $2.5 million of the issuance costs was allocated to the equity component of the Notes, $3.0 million of issuance costs paid to the initial purchaser was accounted for as a debt discount and $0.25 million of the issuance costs was classified as other non-current assets. The debt discount and the issuance costs allocated to the debt component are amortized as additional interest expense over the term of the Notes using the effective interest method. As of December 29, 2013 the remaining amortization period of the debt discount and the issuance costs is 4.9 years. The effective interest rate of the Notes is 7.84% per annum (1.75% coupon rate plus 6.09% of non-cash accretion expense).
	Convertible Note Hedges and Warrants
	Concurrent with the issuance of the Notes on November 6 and 7, 2013, the Company purchased call options for its own common stock to hedge the Notes (the “Note Hedge”) and sold call options for its own common stock (the “Warrants”). The Note Hedges and Warrants transactions are structured to reduce the potential future economic dilution associated with the conversion of the Notes and are excluded from the computation of diluted earnings per share for each period presented, as the Company’s average stock price during each period is less than the conversion price.
	The Note Hedges - on November 6 and 7, 2013, the Company purchased call options from a counterparty for an aggregate price of approximately $39.1 million, which gives the Company the right to buy from the counterparty up to approximately 8.0 million shares of the Company’s common stock at a price of $21.89 per share, subject to adjustments. The Note Hedge is exercisable upon conversion of the Note for a number of shares equal to the product of 0.045683 and amount of the converted Note. Upon exercise of the Note Hedge the Company will receive from the counterparty cash, shares of Company’s common stock, or a combination thereof, equal to the amount by which the market price per share of the Company’s common stock exceeds $21.89 during the applicable valuation period. By the Note Hedge terms the Company will receive cash and shares in a combination that offsets share dilution caused by conversion of the Note.
	Warrants - on November 6 and 7, 2013, the Company sold call options to the same counterparty for approximately $25.6 million, which gives the counterparty the right to buy from the Company up to approximately 8.0 million shares of the Company’s common stock at an exercise price of $28.66 per share, subject to adjustments, on a series of days commencing on February 1, 2019 and ending May 13, 2019. Upon exercise of the Warrants, the Company has the option to deliver cash or shares of its common stock equal to the difference between the market price on the exercise date and the strike price of the warrants. Upon exercise of the Warrants the Company will pay to the Initial Purchaser cash, shares of Company’s common stock, or a combination thereof (at the Company’s choice), equal to the amount by which the market price per share of the Company’s common stock exceeds $28.66 during the applicable valuation period.
	The Note Hedges and Warrants above are classified in stockholders’ equity in the Company’s condensed consolidated balance sheets.
	The following table summarizes the principal amounts and related unamortized discount on the Notes (in thousands):
		Three and Nine Months Ended
		December 29, 2013
	Principal amount of the Note	$	175,000
	Unamortized discount on the Notes		41,190
	Net carrying value	$	133,810
	The following table presents the amount of interest expense recognized related to the Notes (in thousands):
		Three and Nine Months Ended
		December 29, 2013
	Contractual coupon interest expense	$	394
	Amortization of debt discount		1,062
	Amortization of debt issuance costs		7
	Total interest expense related to the Notes	$	1,463
	As of December 29, 2013, our aggregate future principal debt maturities are as follows (in thousands):
	Fiscal Year	Amount
	2014—2017	$	—
	2018		175,000
	Total	$	175,000

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Dec. 29, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	6. Stockholders’ Equity
	Stock Plans
	In July 2011, the Company’s Board of Directors and its stockholders approved the establishment of the 2011 Stock Incentive Plan (the “2011 Plan”). The 2011 Plan provides for annual increases in the number of shares available for issuance there under on the first business day of each fiscal year, equal to four percent (4%) of the number of shares of the Company’s common stock outstanding as of such date, which resulted in an annual increase of 3.4 million shares for fiscal year 2014.
	Under the Company’s 2004 Stock Incentive Plan and 2011 Stock Incentive Plan (the “Plans”), the Board of Directors may grant either incentive stock options, nonqualified stock options, or stock awards to eligible persons, including employees, nonemployees, members of the Board of Directors, consultants and other independent advisors who provide services to the Company. As of December 29, 2013, the Company has reserved for issuance under the Plans a total of 18.8 million shares (plus additional shares subject to automatic increase provisions under the 2011 Plan).
	Incentive stock options may only be granted to employees and at an exercise price of no less than fair value on the date of grant. Nonqualified stock options may be granted at an exercise price of no less than 100% of fair value on the date of grant. For owners of more than 10% of the Company’s common stock, options may only be granted for an exercise price of not less than 110% of fair value, and these options generally expire 10 years from the date of grant. Stock options may be exercisable immediately but subject to repurchase. Stock options vest over the period determined by the Board of Directors, generally four years.
	2013 Employee Stock Purchase Plan
	Under the 2013 Employee Stock Purchase Plan, effective September 13, 2013, (the “Purchase Plan”), eligible employees may apply accumulated payroll deductions, which may not exceed 10% of an employee’s compensation, to the purchase of shares of the Company’s common stock at periodic intervals. The purchase price of stock under the Purchase Plan is equal to 85% of the lower of (i) the fair market value of the Company’s common stock on the first day of each offering period, or (ii) the fair market value of the Company’s common stock on the purchase date (as defined in the Purchase Plan). Each offering period consists of one purchase period of approximately six months duration.
	An aggregate of 400,000 shares of common stock were reserved for issuance to employees under the Purchase Plan. As of December 29, 2013, no shares had been purchased and 400,000 shares were reserved for future issuance under the Purchase Plan.
	Stock option activities of the Company under the Plans are as follows (in thousands, except per share amounts):
		Options			Options			Weighted-			Weighted-			Aggregate
		Available			Issued and			Average			Average			Intrinsic
		for Grant			Outstanding			Exercise			Remaining			Value
								Price			Contractual
											Term
											(In Years)
	Balance—March 31, 2013		10,198			10,495		$	7.65			7.49		$	38,135
	Increase to stock option pool		3,399
	Options granted (weighted-average fair value of $5.76 per share)		(1,460	)		1,460			15.73
	Options exercised		—			(2,491	)		4.02
	Options canceled		448			(448	)		9.7
	Balance—December 29, 2013		12,585			9,016		$	9.86			7.96		$	74,250
	December 29, 2013
	Vested and expected to vest					8,210		$	9.65			7.89		$	69,363
	Exercisable— December 29, 2013					2,964		$	6.34			6.68		$	34,770
	Valuation of Stock-Based Awards
	The Company applies the provisions of ASC 718-10 “Compensation—Stock Compensation” which establishes the accounting for stock-based awards based on the fair value of the award measured at the grant date. Accordingly, stock-based compensation cost is recognized in the condensed consolidated statements of operations as a component of both cost of revenues and operating expenses over the requisite service period. ASC 718-10 requires tax benefits in excess of compensation cost to be reported as a financing cash flow rather than as a reduction of taxes paid. The determination of the fair value of stock-based payment awards on the date of grant using the Black-Scholes option pricing model is affected by the volatilities of a peer group of companies based on industry, stage of life cycle, size and financial leverage, actual and projected employee stock option exercise behaviors, risk-free interest rate and expected dividends. Variables to be determined include expected volatility, estimated term and risk-free interest rate.
	The aggregate intrinsic value of the stock options exercised during the three and nine months ended December 29, 2013 was $5.8 million and $28.5 million respectively. The aggregate intrinsic value of the stock options exercised during the three and nine months ended December 30, 2012 was $4.7 million and $24.4 million, respectively. The aggregate intrinsic value was calculated as the difference between the exercise price of the stock options and the estimated fair market value of the underlying common stock at the date of exercise.
	The number of options expected to vest takes into account an estimate of expected forfeitures. The remaining unamortized stock-based compensation expense, reduced for estimated forfeitures and related to non-vested options, was $19.9 million, and $18.7 million at December 29, 2013 and March 31, 2013 respectively, and, for both periods will be amortized over a weighted-average remaining period of approximately 2.9 years. Total unrecognized expense will be adjusted for future changes in estimated forfeitures.
	Weighted-Average Assumptions
	Expected Term
	Prior to the third quarter of fiscal year 2013, the Company used the simplified method described in Staff Accounting Bulletin Topic 14, Share-Based Payment, to estimate expected term. Beginning with the third quarter of fiscal year 2013, the Company used historical experience to estimate the expected term as the Company believed it had accumulated enough historical data on which to base this estimate. The change to historical data did not result in a significant change in the expected term used in the Black-Scholes computation.
	Expected Volatility
	The Company estimates volatility for option grants by evaluating the average historical volatility of peer group companies for the period immediately preceding the option grant for a term that is approximately equal to the option’s expected term and by evaluating the average historical volatility of the Company’s common stock dating from the Company’s initial public offering in November 2011.
	Risk-Free Interest Rate
	The Company bases the risk-free interest rate that it uses in the Black-Scholes option pricing model on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
	Expected Dividend
	The Company does not anticipate paying any cash dividends in the foreseeable future and, therefore, uses an expected dividend yield of zero in the Black-Scholes option pricing model.
	The Company used the following weighted-average assumptions in determining stock-based compensation expense for the three and nine months ended December 29, 2013 and December 30, 2012.
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,			December 30,
		2013			2012			2013			2012
	Expected Term		4.8 years			4.3 years			4.7 years			6.0 years
	Volatility		40.5	%		46.5	%		41.5	%		47.7	%
	Risk-free interest rate		1	%		0.6	%		1.2	%		0.9	%
	Dividend yield		0	%		0	%		0	%		0	%
	Restricted Stock Units and Restricted Stock
	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows (in thousands, except per share amounts):
	Restricted stock unit and restricted stock activity	Shares			Weighted average
					grant date
					fair value per share
		(in thousands)
	Nonvested at March 31, 2013		806		$	12.05
	Granted		1,823			15.55
	Vested		(147	)		11.89
	Forfeited		(113	)		12.7
	Nonvested at December 29, 2013		2,369		$	14.73
	Restricted stock units and restricted stock granted to employees are generally subject to the employee’s continued service to the Company over that period. The fair value of restricted stock units and restricted stock is determined using the fair value of the Company’s common stock on the date of the grant. Compensation expense is generally recognized on a straight-line basis over the requisite service period of each grant, adjusted for estimated forfeitures. At December 29, 2013, there was approximately $26.0 million of total unrecognized compensation cost related to restricted stock units and restricted stock, which the Company expects to recognize over a weighted-average period of 3.3 years. The weighted-average grant-date fair value per share of restricted stock units and restricted stock awarded in the nine months ended December 29, 2013 was $15.55. The weighted-average grant-date fair value per share of restricted stock units and restricted stock awarded in the nine months ended December 30, 2012 was $12.01.
	Stock-Based Compensation Expense
	Total stock-based compensation cost for the Company’s stock plans for the three and nine months ended December 29, 2013 and December 30, 2012 is as follows:
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,			December 30,
		2013			2012			2013			2012
		(in thousands)
Cost of revenue	$	349		$	191		$	845		$	522
Research and development		1,665			752			3,941			2,075
Selling, general and administrative		2,705			1,814			6,110			3,852
Total stock-based compensation expense	$	4,719		$	2,757		$	10,896		$	6,449
Common Stock
As of December 29, 2013 and March 31, 2013, common stock reserved for future issuance was as follows (in thousands):
	Number of Shares
Common stock reserved for issuance	December 2013			March 2013
Stock Plans:
Outstanding stock options		9,016			10,495
Outstanding restricted stock units and restricted stock		2,369			806
Reserved for future equity incentive grants		10,765			9,383
		22,150			20,684
Warrants to purchase common stock		—			94
Total common stock reserved for future issuances		22,150			20,778

Income_Taxes

Income Taxes	9 Months Ended
	Dec. 29, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	In the three and nine months ended December 29, 2013, the Company recorded an income tax provision (benefit) of $(2.6) million and $1.2 million respectively. In the three months ended December 30, 2012, the Company recorded an income tax benefit of $0.7 million. In the nine months ended December 30, 2012, the Company recorded an income tax provision of $5.0 million. The Company’s estimated fiscal year 2014 effective tax rate differs from the U.S. statutory rate primarily due to profits earned in jurisdictions where the tax rate is lower than the U.S. tax rate, partially offset by the unfavorable effects of non-deductible stock-based compensation expense.
	The Company files U.S. federal income tax returns as well as income tax returns in California and various foreign jurisdictions. The Company has not provided for U.S. federal income and foreign withholding taxes on undistributed earnings from non-U.S. operations as of December 29, 2013 because such earnings are to be reinvested indefinitely.
	The Company’s tax years from 2003 and onwards could be subject to examinations by tax authorities in one or more tax jurisdictions. The Company has recorded $9.3 million of uncertain tax positions within “Long-term liabilities” on the condensed consolidated balance sheet as at December 29, 2013. In the three months and nine months ended December 29, 2013, the Company recorded uncertain tax provision in the amounts of $0.5 million and $2.4 million respectively in which $1.0 million is related to foreign income taxes. While management believes that the Company has adequately provided for all tax positions, amounts asserted by tax authorities could be greater or less than the recorded position. Accordingly, the Company’s provisions on federal, state and foreign tax-related matters to be recorded in the future may change as revised estimates are made or the underlying matters are settled or otherwise resolved.

Acquisition

Acquisition	9 Months Ended
	Dec. 29, 2013
Business Combinations [Abstract]	'
Acquisition	'
	8. Acquisition
	On October 14, 2013, the Company entered into a definitive Master Asset Purchase and Sale Agreement with Analog Devices, Inc. (“ADI”). The transaction closed on October 31, 2013. The Company acquired certain assets relating to ADI’s MEMS microphone business for a purchase price of $100 million in cash, of which the Company is entitled to certain contingent future expense reimbursements of approximately $2.2 million. The Company also agreed to a contingent cash payment of up to $70.0 million payable upon the achievement of certain revenue performance targets. Due to a low probability of achieving the revenue targets, the fair value of the contingent consideration is estimated to be zero in the purchase price allocation described below. ADI licensed certain technology related to the MEMS microphone business to the Company on a royalty-free, worldwide basis, and provides certain transition services to the Company following the closing.
	The acquisition has been accounted for using the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) 805 - Business Combinations. Under the acquisition method of accounting, the total purchase consideration of the acquisition is allocated to the tangible assets and identifiable intangible assets and liabilities assumed based on their relative fair values. The excess of the purchase consideration over the net tangible and identifiable intangible assets is recorded as goodwill, and was derived from expected benefits from future technology development, synergies and the knowledgeable and experienced workforce who joined the Company after the acquisition. The company incurred $2.0 million and $2.1 million of acquisition related costs in the three and nine months ended December 29, 2013, respectively.
	The strategic rationale for the acquisition was to accelerate the Company’s audio roadmap and complement its current MEMS System on Chip product offerings at existing mobile, gaming and wearable device customers, while gaining entry into new markets. The acquisition expands the Company’s patent portfolio and existing tier one customer base, which includes major OEM brands worldwide.
	The purchase price allocation is based on estimates, assumptions, third party valuations and other studies of the value of the acquired assets which have not progressed to a stage where there is sufficient information to make a definitive allocation. Accordingly, purchase price allocation and adjustments reported herein will remain preliminary until the Company has all of the information necessary to finalize the allocation of the purchase price, and the final acquisition accounting adjustments could differ materially from the pro-forma adjustments presented herein. Any increase or decrease in the fair value of the Microphone Product Line’s tangible and identifiable intangible assets and liabilities, as compared to the information shown herein, would also change the portion of purchase price allocable to goodwill and could impact the operating results of the Company due to differences in amortization related to these assets and liabilities. The Company intends to complete the purchase price allocation within twelve months of the closing of the acquisition.
	The following table summarizes the preliminary purchase price of the assets acquired and the liabilities assumed as of October 31, 2013, the completion of the acquisition.
		Total Amount
	Assets Acquired	(in thousands)
	Inventories	$	5,107
	Property and equipment, net		4,193
	Intangible assets:
	Developed Technology		28,520
	In-Process Research & Development		7,330
	Customer Relationships		1,560
	Goodwill		51,098
	Total assets acquired		97,808
	Total purchase price (net of $2.2 million of contingent expense reimbursements)	$	97,808
	The preliminary fair value of intangible assets of $37.4 million has been allocated on a preliminary, tentative basis to the following three asset categories: 1) developed technology, 2) in-process research & development and 3) customer relationships. Developed technology and customer relationships will be amortized on a straight line basis over the estimated useful life of the assets.
	The following table represents the estimated useful lives of developed technology and customer relationships:
		Fair Value			Estimated
		Amount			Useful
					Life
		(in thousands)			(in years)
	Developed Technology	$	28,520		6
	Customer Relationships	$	1,560		7
	The preliminary fair values of the identifiable intangible assets: developed technology, in-process research & development and customer relationships were determined using the following methodologies:
	Developed Technology: The value assigned to the acquired developed technology was determined using the Multi-period excess earnings method. The fair value of developed technology was capitalized as of the acquisition date and will be amortized using a straight-line method to cost of revenues over the estimated remaining life of 6 years.
	In-Process Research & Development: The value assigned to the acquired in process research and development was determined using the multi-period excess earnings method. The fair value of in-process research & development was capitalized as of the acquisition date. In-process research and development capitalized at acquisition is not amortized, and is assessed for impairment on a fair value basis each fiscal quarter until the point at which the project is completed or fails. If successfully completed, acquired in process research and development is amortized over their expected useful life.
	Customer Relationships: An intangible customer relationship asset was recognized to the extent that the Company was expected to benefit from future revenues reasonably anticipated given the history and operating practices of Microphone Product Line. The value assigned to customer relationships was determined using the incremental cash flow method. The fair value of customer relationships was capitalized as of the acquisition date and will be amortized using a straight-line method to sales and marketing expenses over the estimated remaining life of 7 years.
	The amounts of revenue and earnings of the Microphone Product Line since the acquisition date included in the condensed consolidated statements of operations for the current reporting periods have not been presented because the impact was not material to the Company’s consolidated results of operations.
	Pro Forma Information
	For the purpose of the summary unaudited pro forma combined supplemental information, the acquisition was assumed to have occurred as of April 2, 2012. The pro forma information for the nine months ended December 2013 and December 2012 has been calculated after applying the Company’s accounting policies and including adjustments to reflect the additional amortization of intangible assets, and additional cost of revenues related to the inventory markup that would have been charged assuming the fair value adjustments had been incurred as of April 2, 2012. The unaudited pro forma combined financial information is for informational purposes only and does not purport to represent what the Company’s actual results would have been if the acquisition had been completed as of the date indicated above, or that may be achieved in the future. The unaudited pro forma combined supplemental information does not include the effects of any cost savings from operating efficiencies or synergies that may result from the acquisition.
		Nine Months Ended		Nine Months Ended
		December 29,		December 30,
		2013		2012
		(in thousands)
	Revenues	$217,593		$208,709
	Net income	$9,683		$38,663

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Dec. 29, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	9. Goodwill and Intangible Assets
	There were no changes in the carrying amount of goodwill since October 31, 2013, the closing date of the MEMS microphone business acquisition.
	Intangible assets subject to amortization consist primarily of developed technology and customer relationships and are reported net of accumulated amortization. Developed technology and customer relationships will be amortized on a straight line basis over the estimated useful life of the assets. In-process research and development is assessed for impairment until the development is completed and products are available for sale. The Company expects to complete the in-process research and development projects at various dates during 2014 at which time amortization will commence.”
	The Company expects to complete in-process research and development and commence amortization in 2015. Amortization for acquired intangible assets was approximately $0.8 million for both the three and nine months ended December 29, 2013. The Company does not believe there is any significant residual value associated with the following intangible assets:
		December 29, 2013
	(in thousands)	Gross		Accumulated		Net
				Amortization
	Developed Technology	$	28,520	$	792	$	27,728
	Customer Relationships		1,560		37		1,523
	Total intangible assets subject to amortization	$	30,080	$	829	$	29,251
	The estimated future amortization expense related to intangible assets at December 29, 2013, is as follows:
	Fiscal Year	Estimated
		Amortization
		(in thousands)
	2013 (remaining 3 months)	$	1,244
	2014		4,976
	2015		4,976
	2016		4,976
	2017		4,976
	Thereafter		8,103
	Total	$	29,251

Subsequent_Events

Subsequent Events	9 Months Ended
	Dec. 29, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	10. Subsequent events
	Legal Proceedings
	On May 16, 2012, STMicroelectronics, Inc. (“STI”) filed a patent infringement complaint (“ST Microelectronics Patent Litigation I”) in the Northern District of California against the Company, alleging infringement of certain of their patents (collectively, the “Asserted Patents”). STI alleged that certain lnvenSense Micro-Electro-Mechanical Systems (“MEMS”) products and services, including but not limited to InvenSense’s ISZ, IXZ, IDG, IMU, ITG, and MPU product lines, infringed one or more claims of the Asserted Patents. On July 9, 2012, the Company filed counterclaims against STI for alleged infringement of certain of the Company’s patents. On February 27, 2013, the Court granted the Company’s request and stayed the litigation until “final exhaustion of all patent reexamination proceedings, including appeals.”
	On March 11, 2013, STI filed a request with the United States International Trade Commission (“ITC”) that the ITC institute an investigation under Section 337 of the Tariff Act of 1930 against the Company, Roku, Inc., and Black & Decker (U.S.) Inc., concerning the alleged infringement of five patents (collectively, the “ITC Patents”), three of which were previously asserted in ST Microelectronics Patent Litigation I and two of which were newly asserted patents. STI alleged that certain InvenSense “MEMS” products and services, including but not limited to InvenSense’s ISZ, IMU, ITG, and MPU product lines, infringed one or more claims of the ITC Patents. STI additionally alleged that certain Roku devices that incorporate certain InvenSense MEMS products, including but not limited to the Roku 2 XS, infringed one or more claims of a subset of the ITC Patents. STI additionally alleged that certain Black & Decker devices that incorporate certain InvenSense MEMS products, including but not limited to the Black & Decker 4v Max Gyro Rechargeable Screwdriver, infringed one or more claims of a subset of the ITC Patents. On April 10, 2013, the ITC instituted this investigation. On September 13, 2013, the ITC held a Markman hearing and issued its Markman order on January 29, 2014. On June 11, 2013, August 14, 2013, and October 14, 2013, the parties met for settlement conferences ordered by the ITC, but the parties were unable to agree to a settlement of the claims in this investigation.
	On March 12, 2013, STI filed a patent infringement complaint in the Northern District of California against the Company, alleging infringement of the two patents that were newly asserted in the ITC Investigation (collectively, the “Newly Asserted Patents”) that were not previously asserted in ST Microelectronics Patent Litigation I. STI alleged that certain InvenSense MEMS products and services, including but not limited to InvenSense’s ISZ, IMU, ITG, and MPU product lines, infringed one or more claims of the Newly Asserted Patents. On April 16, 2013, the Court granted the Company’s request, staying the litigation until the determination of the ITC becomes final.
	On May 14, 2013, the Company brought a lawsuit against STI in federal court in the Eastern District of Texas, alleging that STI infringed three of the Company’s patents. The Company asserted three patents against STI in this case: U.S. Patent Nos. 8,347,717, 8,351,773, and 8,250,921 and sought monetary damages. The court conducted a scheduling conference in September 2013, and the Parties exchanged their respective infringement and invalidity contentions. The Company amended its complaint to add STI’s parent STNV to the lawsuit. STNV filed a motion to dismiss and the Company filed its opposition brief to it. InvenSense filed a letter brief requesting permission from the Judge to file an early motion for summary judgment of infringement of the ‘717 patent by STI. The briefing on that request was completed and the parties were awaiting a decision by the Judge when the Judge ruled that venue is proper in East Texas but also ruled that the Northern District of California would be a more appropriate court for this litigation given its past involvement in other cases between the parties. The Company asked the Judge to reconsider that transfer decision, given that all of the California litigation between InvenSense and STI was suspended very early and substantially without substantive deliberation.
	Subsequently, on February 9, 2014, the Company and STI settled and resolved all litigation and re-examination proceedings pending between them for a one- time cash payment of $15.0 million to STI, and entered into a patent cross license agreement. The other terms of the settlement and the patent cross license agreement remain confidential and are not expected to have a material impact on the future results of the Company. This settlement and patent cross license resolves all outstanding legal proceeding between the Company and STI. The settlement resulted in the Company recognizing a pre-tax charge of $14.5 million during the quarter ended December 29, 2013.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Dec. 29, 2013
Accounting Policies [Abstract]	'
Business	'
	Business
	InvenSense, Inc. (“the Company”) was incorporated in California in June 2003 and reincorporated in Delaware in January 2004. The Company designs, develops, markets and sells MEMS sensors, such as accelerometers, gyroscopes and microphones for consumer electronics, and is dedicated to bringing the best-in-class size, performance and cost solutions to market. Targeting applications in smartphones and tablets, console and portable video gaming devices, digital still and video cameras, smart TVs (including digital set-top boxes, televisions and multi-media HDDs), navigation devices, toys, and health and fitness accessories, the Company delivers leading solutions based on its advanced multi-axis technology.
	These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto for the fiscal year ended March 31, 2013 included in the Company’s Annual Report on Form 10-K filed on June 14, 2013 with the Securities and Exchange Commission (“SEC”). No material changes have been made to the Company’s significant accounting policies since the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2013.
Certain Significant Business Risks and Uncertainties	'
	Certain Significant Business Risks and Uncertainties
	The Company participates in the high-technology industry and believes that adverse changes in any of the following areas could have a material effect on the Company’s future financial position, results of operations, or cash flows: reliance on a limited number of primary customers to support the Company’s revenue generating activities; advances and trends in new technologies and industry standards; market acceptance of the Company’s products; development of sales channels; strategic relationships, including key component suppliers; litigation or claims against the Company based on intellectual property, patent, product, regulatory, or other factors; and the Company’s ability to attract and retain employees necessary to support its growth.
Fiscal Year	'
	Fiscal Year
	The Company’s fiscal year is a 52 or 53 week period ending on the Sunday closest to March 31. The Company’s most recent completed fiscal year (“Fiscal 2013”) ended on March 31, 2013 (“March 2013”). The third fiscal quarter in each of the two most recent fiscal years ended on December 29, 2013 (“three months ended December 29, 2013” or “December 2013”) and December 30, 2012 (“three months ended December 30, 2012” or “December 2012”), respectively, and each third fiscal quarter period included 13 weeks.
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.
	The condensed consolidated balance sheet as of March 31, 2013, included herein was derived from the audited financial statements as of that date, but does not include all disclosures required by GAAP. The unaudited interim condensed consolidated financial statements, in the opinion of management, reflect all normal recurring adjustments necessary to present fairly the Company’s financial position, results of operations, comprehensive income and cash flows for the interim periods. The results of operations for the period ended December 29, 2013 is not necessarily indicative of the results to be expected for the fiscal year ending March 30, 2014 or for any future year or interim period.
Basis of Consolidation	'
	Basis of Consolidation
	All intercompany transactions and balances have been eliminated upon consolidation. The functional currency of each of the Company’s subsidiaries is the U.S. dollar. Foreign currency gains or losses are recorded as “Other income (expense), net” in the condensed consolidated statements of income.
Use of Estimates	'
	Use of Estimates
	The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Significant estimates included in the condensed consolidated financial statements and related notes include income taxes, inventory valuation, stock-based compensation, loss contingencies and warranty reserves. These estimates are based upon information available as of the date of the consolidated financial statements, and actual results could differ from those estimates.
Concentration of Credit Risk	'
	Concentration of Credit Risk
	At December 29, 2013, three customers each accounted for 25%, 23% and 12% of total accounts receivable. At December 30, 2012, four customers each accounted for 17%, 16%, 14% and 14% of total accounts receivable.
	For the three months ended December 29, 2013, three customers each accounted for 32%, 16% and 10% of total net revenue. For the nine months ended December 29, 2013, one customer accounted for 32% of total net revenue. For the three months ended December 30, 2012, three customers each accounted for 24%, 22% and 10% of total net revenue. For the nine months ended December 30, 2012, three customers each accounted for 23%, 20% and 13% of total net revenue.
Warranty	'
	Warranty
	The Company’s warranty agreements are contract and component specific and can be up to three years for selected components. The Company’s accrual for anticipated warranty costs has declined, primarily due to a decline in the historical volume of product returned under the warranty program. The accrual also includes management’s judgment regarding anticipated rates of warranty claims and associated repair costs. The following table summarizes the activity related to the product warranty liability during the nine months ended December 29, 2013 and December 30, 2012:
		Nine months Ended
		December 29, 2013			December 30, 2012
		(in thousands)
	Beginning balance	$	123		$	361
	(Decrease) increase in provision for warranty		(4	)		(199	)
	Less: actual warranty costs		(30	)		(32	)
	Ending balance	$	89		$	130
Net Income (Loss) Per Share	'
	Net Income (Loss) Per Share
	Basic net income (loss) per share is computed by dividing net income by the weighted average number of shares outstanding during the period, which excludes dilutive unvested restricted stock.
	Diluted net income (loss) per share is computed by dividing net income by the weighted average number of shares outstanding, including unvested restricted stock, certain warrants to purchase common stock and potential dilutive shares from the dilutive effect of outstanding stock options using the treasury stock method. Diluted net loss per share is equal to basic net loss per share as potentially dilutive securities are anit-dilutive due to the net loss.
	The following table presents the calculation of basic and diluted net income per share:
		Three Months Ended						Nine months Ended
		December 29, 2013			December 30, 2012			December 29, 2013		December 30, 2012
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted:
	Net income (loss)	$	(12,179	)	$	16,818		$	11,751	$	38,133
	Denominator:
	Basic shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Diluted shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		—			3,964			3,165		4,765
	Common stock warrants		—			168			54		187
	Weighted average shares used in computing diluted net income (loss) per share		87,047			87,350			89,364		87,232
	Net income (loss) per share:
	Basic	$	(0.14	)	$	0.2		$	0.14	$	0.46
	Diluted	$	(0.14	)	$	0.19		$	0.13	$	0.44
	The following summarizes the potentially dilutive securities outstanding at the end of each period that were excluded from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive:
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,		December 30,
		2013			2012			2013		2012
		(in thousands)
	Employee stock options		9,016			3,423			2,922		4,004
	Unvested restricted stock units		2,369			590			830		152
	Total antidilutive securities		11,385			4,013			3,752		4,156
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, “Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” that will require the presentation of certain unrecognized tax benefits as reductions to deferred tax assets rather than as liabilities in our Condensed Consolidated Balance Sheets when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This standard is effective for fiscal years beginning on or after December 15, 2013, and for interim periods within those fiscal years which will be the Company’s fiscal year 2015. The Company is currently evaluating the impact of this new standard on its Condensed Consolidated Financial Statements.
	In February 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” which adds new disclosure requirements for items reclassified out of accumulated other comprehensive income. ASU No. 2011-02 became effective for fiscal years, and interim periods within those years, beginning after December 15, 2012, which is the Company’s fiscal interim period ended June 30, 2013 of fiscal year ending March 30, 2014, and the adoption did not impact the Company’s financial condition or results of operations.
Fair Value Measurements	'
	The Company applies the provisions of ASC 820-10, “Fair Value Measurements”. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. ASC 820-10 requires disclosure that establishes a framework for measuring fair value and expands disclosure about fair value measurements. The standard describes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The inputs for the first two levels are considered observable and the last is unobservable and include the following:
	Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2—Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or
	Level 3—Unobservable inputs in which there is little or no market data, and as a result, prices or valuation techniques are employed that require inputs that are significant to the fair value measurement.
Compensation-Stock Compensation	'
	The Company applies the provisions of ASC 718-10 “Compensation—Stock Compensation” which establishes the accounting for stock-based awards based on the fair value of the award measured at the grant date. Accordingly, stock-based compensation cost is recognized in the condensed consolidated statements of operations as a component of both cost of revenues and operating expenses over the requisite service period. ASC 718-10 requires tax benefits in excess of compensation cost to be reported as a financing cash flow rather than as a reduction of taxes paid. The determination of the fair value of stock-based payment awards on the date of grant using the Black-Scholes option pricing model is affected by the volatilities of a peer group of companies based on industry, stage of life cycle, size and financial leverage, actual and projected employee stock option exercise behaviors, risk-free interest rate and expected dividends. Variables to be determined include expected volatility, estimated term and risk-free interest rate.

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Dec. 29, 2013
Accounting Policies [Abstract]	'
Summary of Activity Related to Product Warranty Liability	'
	The following table summarizes the activity related to the product warranty liability during the nine months ended December 29, 2013 and December 30, 2012:
		Nine months Ended
		December 29, 2013			December 30, 2012
		(in thousands)
	Beginning balance	$	123		$	361
	(Decrease) increase in provision for warranty		(4	)		(199	)
	Less: actual warranty costs		(30	)		(32	)
	Ending balance	$	89		$	130
Calculation of Basic and Diluted Net Income Per Share	'
	The following table presents the calculation of basic and diluted net income per share:
		Three Months Ended						Nine months Ended
		December 29, 2013			December 30, 2012			December 29, 2013		December 30, 2012
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted:
	Net income (loss)	$	(12,179	)	$	16,818		$	11,751	$	38,133
	Denominator:
	Basic shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Diluted shares:
	Weighted average shares used in computing basic net income (loss) per share		87,047			83,218			86,145		82,280
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		—			3,964			3,165		4,765
	Common stock warrants		—			168			54		187
	Weighted average shares used in computing diluted net income (loss) per share		87,047			87,350			89,364		87,232
	Net income (loss) per share:
	Basic	$	(0.14	)	$	0.2		$	0.14	$	0.46
	Diluted	$	(0.14	)	$	0.19		$	0.13	$	0.44
Securities Excluded from Computation of Diluted Net Income (Loss) Per Share	'
	The following summarizes the potentially dilutive securities outstanding at the end of each period that were excluded from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive:
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,		December 30,
		2013			2012			2013		2012
		(in thousands)
	Employee stock options		9,016			3,423			2,922		4,004
	Unvested restricted stock units		2,369			590			830		152
	Total antidilutive securities		11,385			4,013			3,752		4,156

Cash_Equivalents_and_Available1

Cash Equivalents and Available-for-sale Investments (Tables)	9 Months Ended
	Dec. 29, 2013
Cash And Cash Equivalents [Abstract]	'
Assets Measured at Fair Value on Recurring Basis	'
	Assets measured at fair value on a recurring basis were presented in the Company’s condensed consolidated balance sheet as of December 29, 2013.
		December 2013		Quoted Prices		Significant			Significant
		Balance		in Active		Other			Other
				Markets for		Observable			Unobservable
				Identical		Inputs			Inputs
				Assets Level 1		Level 2			Level 3
		(in thousands)
	Investment Class
	Money Market Funds	$	26,913	$	26,913	$	—		$	—
	Corporate Notes and Bonds		212,245		—		212,245			—
	Commercial Paper		8,979		—		8,979			—
	Municipal Notes and Bonds		3,933		—		3,933			—
	Total	$	252,070	$	26,913	$	225,157		$	—
	Financial Statement Classification
	Cash equivalents	$	26,913	$	26,913	$	—		$	—
	Short-term investments		55,057		—		55,057			—
	Long-term investments		170,100		—		170,100			—
	Total	$	252,070	$	26,913	$	225,157		$	—
		Dec-13		Gross		Gross			Dec-13
		Amortized Cost		Unrealized		Unrealized			Estimated FMV
				Gain		Loss
	Investment Class
	Corporate Notes and Bonds and Municipal Notes and Bonds	$	212,401	$	—	$	(156	)	$	212,245
	Commercial Paper		8,980		—		(1	)		8,979
	Municipal Notes and Bonds		3,927		6		—			3,933
	Total Available-for-sale investments	$	225,308	$	6	$	(157	)	$	225,157
	Cash equivalents									26,913
	Total Aggregate Fair Value								$	252,070
	Assets measured at fair value on a recurring basis were presented in the Company’s consolidated balance sheet as of March 31, 2013.
		March 2013		Quoted Prices		Significant			Significant
		Balance		in Active		Other			Other
				Markets for		Observable			Unobservable
				Identical		Inputs			Inputs
				Assets Level 1		Level 2			Level 3
		(in thousands)
	Investment Class
	Money Market Funds	$	22,860	$	22,860	$	—		$	—
	Corporate Notes and Bonds		94,485		—		94,485			—
	Commercial Paper		2,998		—		2,998			—
	U.S. Agency Securities		1,999		—		1,999			—
	Total	$	122,342	$	22,860	$	99,482		$	—
	Financial Statement Classification
	Cash equivalents	$	22,860	$	22,860	$	—		$	—
	Short-term investments		77,040		—		77,040			—
	Long-term investments		22,442		—		22,442			—
	Total	$	122,342	$	22,860	$	99,482		$	—
		Mar-13		Gross		Gross			Mar-13
		Amortized Cost		Unrealized		Unrealized			Estimated FMV
				Gain		Loss
	Investment Class
	Corporate Notes and Bonds	$	94,407	$	78	$	—		$	94,485
	Commercial Paper		2,997		1		—			2,998
	U.S. Agency Securities		2,001		—		(2	)		1,999
	Total Available-for-sale investments	$	99,405	$	79	$	(2	)	$	99,482
	Cash equivalents									22,860
	Total Aggregate Fair Value								$	122,342

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	9 Months Ended
	Dec. 29, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Inventories	'
	Inventories at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Work in progress		$	43,396		$	18,803
	Finished goods			15,116			4,959
	Total inventories		$	58,512		$	23,762
Prepaid Expenses and Other Current Assets	'
	Prepaid expenses and other current assets at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Tax receivable		$	6,334		$	6,374
	Other receivable			2,930			87
	Prepaid expenses			2,594			2,209
	Deferred tax assets			1,035			951
	Other current assets			1,863			857
	Advance to and receivable from vendors			3,353			2,824
	Total prepaid expenses and other current assets		$	18,109		$	13,302
Property and Equipment	'
	Property and equipment at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Production and lab equipment		$	22,895		$	11,654
	Computer equipment and software			3,483			1,124
	Equipment under construction			4,810			1,851
	Leasehold improvements and furniture and fixtures			2,263			923
	Subtotal		$	33,451		$	15,552
	Accumulated depreciation and amortization			(9,796	)		(6,902	)
	Property and equipment—net		$	23,655		$	8,650
Accrued Liabilities	'
	Accrued liabilities at December 29, 2013 and March 31, 2013 consist of the following:
			December 2013			March 2013
			(in thousands)
	Litigation settlement		$	14,500		$	—
	Payroll-related expenses			4,283			2,777
	Legal fees			3,245			884
	Other accrued liabilities			3,541			819
	Bonuses			1,874			2,120
	Accrued acquisition related costs			1,289			—
	Accrued interest payable			384			—
	Former CEO separation costs (1)			184			828
	Engineering services			293			106
	Warranty reserves			89			123
	Income tax payable			42			96
	Total accrued liabilities		$	29,724		$	7,753
	-1	During the third quarter of fiscal year 2013, the Company’s founder and CEO resigned. Under the terms of his employment agreement, he will receive severance payments totaling $828,000 through the end of fiscal year 2014.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Dec. 29, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments Under Operating Leases	'
	Future minimum lease payments under operating leases as of December 29, 2013 are as follows:
	Fiscal Years Ending:	Amount
		(in thousands)
	2014 (remainder)	$	649
	2015		3,124
	2016		3,820
	2017		3,967
	2018		3,961
	Beyond		6,926
	Total	$	22,447

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	9 Months Ended
	Dec. 29, 2013
Debt Disclosure [Abstract]	'
Summary of Principal Amounts and Related Unamortized Discount on Notes	'
	The following table summarizes the principal amounts and related unamortized discount on the Notes (in thousands):
		Three and Nine Months Ended
		December 29, 2013
	Principal amount of the Note	$	175,000
	Unamortized discount on the Notes		41,190
	Net carrying value	$	133,810
Schedule of Interest Expense Recognized Related to Notes	'
	The following table presents the amount of interest expense recognized related to the Notes (in thousands):
		Three and Nine Months Ended
		December 29, 2013
	Contractual coupon interest expense	$	394
	Amortization of debt discount		1,062
	Amortization of debt issuance costs		7
	Total interest expense related to the Notes	$	1,463
Schedule of Aggregate Future Principal Debt Maturities	'
	As of December 29, 2013, our aggregate future principal debt maturities are as follows (in thousands):
	Fiscal Year	Amount
	2014—2017	$	—
	2018		175,000
	Total	$	175,000

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Dec. 29, 2013
Equity [Abstract]	'
Stock Option Activities	'
	Stock option activities of the Company under the Plans are as follows (in thousands, except per share amounts):
		Options			Options			Weighted-			Weighted-			Aggregate
		Available			Issued and			Average			Average			Intrinsic
		for Grant			Outstanding			Exercise			Remaining			Value
								Price			Contractual
											Term
											(In Years)
	Balance—March 31, 2013		10,198			10,495		$	7.65			7.49		$	38,135
	Increase to stock option pool		3,399
	Options granted (weighted-average fair value of $5.76 per share)		(1,460	)		1,460			15.73
	Options exercised		—			(2,491	)		4.02
	Options canceled		448			(448	)		9.7
	Balance—December 29, 2013		12,585			9,016		$	9.86			7.96		$	74,250
	December 29, 2013
	Vested and expected to vest					8,210		$	9.65			7.89		$	69,363
	Exercisable— December 29, 2013					2,964		$	6.34			6.68		$	34,770
Weighted-Average Assumptions in Determining Stock-Based Compensation Expense	'
	The Company used the following weighted-average assumptions in determining stock-based compensation expense for the three and nine months ended December 29, 2013 and December 30, 2012.
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,			December 30,
		2013			2012			2013			2012
	Expected Term		4.8 years			4.3 years			4.7 years			6.0 years
	Volatility		40.5	%		46.5	%		41.5	%		47.7	%
	Risk-free interest rate		1	%		0.6	%		1.2	%		0.9	%
	Dividend yield		0	%		0	%		0	%		0	%
Restricted Stock Unit and Restricted Stock Activity	'
	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows (in thousands, except per share amounts):
	Restricted stock unit and restricted stock activity	Shares			Weighted average
					grant date
					fair value per share
		(in thousands)
	Nonvested at March 31, 2013		806		$	12.05
	Granted		1,823			15.55
	Vested		(147	)		11.89
	Forfeited		(113	)		12.7
	Nonvested at December 29, 2013		2,369		$	14.73
Summary of Total Stock-Based Compensation Cost	'
	Total stock-based compensation cost for the Company’s stock plans for the three and nine months ended December 29, 2013 and December 30, 2012 is as follows:
		Three Months Ended						Nine months Ended
		December 29,			December 30,			December 29,			December 30,
		2013			2012			2013			2012
		(in thousands)
	Cost of revenue	$	349		$	191		$	845		$	522
	Research and development		1,665			752			3,941			2,075
	Selling, general and administrative		2,705			1,814			6,110			3,852
	Total stock-based compensation expense	$	4,719		$	2,757		$	10,896		$	6,449
Common Stock Reserved for Future Issuance	'
	As of December 29, 2013 and March 31, 2013, common stock reserved for future issuance was as follows (in thousands):
		Number of Shares
	Common stock reserved for issuance	December 2013			March 2013
	Stock Plans:
	Outstanding stock options		9,016			10,495
	Outstanding restricted stock units and restricted stock		2,369			806
	Reserved for future equity incentive grants		10,765			9,383
			22,150			20,684
	Warrants to purchase common stock		—			94
	Total common stock reserved for future issuances		22,150			20,778

Acquisition_Tables

Acquisition (Tables)	9 Months Ended
	Dec. 29, 2013
Business Combinations [Abstract]	'
Summary of Preliminary Purchase Price of Assets Acquired and Liabilities Assumed	'
	The following table summarizes the preliminary purchase price of the assets acquired and the liabilities assumed as of October 31, 2013, the completion of the acquisition.
		Total Amount
	Assets Acquired	(in thousands)
	Inventories	$	5,107
	Property and equipment, net		4,193
	Intangible assets:
	Developed Technology		28,520
	In-Process Research & Development		7,330
	Customer Relationships		1,560
	Goodwill		51,098
	Total assets acquired		97,808
	Total purchase price (net of $2.2 million of contingent expense reimbursements)	$	97,808
Summary of Fair Value and Estimated Useful Lives of Intangible Assets	'
	The following table represents the estimated useful lives of developed technology and customer relationships:
		Fair Value			Estimated
		Amount			Useful
					Life
		(in thousands)			(in years)
	Developed Technology	$	28,520		6
	Customer Relationships	$	1,560		7
Summary of Unaudited Proforma of Combined Financial Information	'
	The unaudited pro forma combined supplemental information does not include the effects of any cost savings from operating efficiencies or synergies that may result from the acquisition.
		Nine Months Ended		Nine Months Ended
		December 29,		December 30,
		2013		2012
		(in thousands)
	Revenues	$217,593		$208,709
	Net income	$9,683		$38,663

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Dec. 29, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Summary of Intangible Assets	'
	The Company does not believe there is any significant residual value associated with the following intangible assets:
		December 29, 2013
	(in thousands)	Gross		Accumulated		Net
				Amortization
	Developed Technology	$	28,520	$	792	$	27,728
	Customer Relationships		1,560		37		1,523
	Total intangible assets subject to amortization	$	30,080	$	829	$	29,251
Estimated Future Amortization Expense Related to Intangible Assets	'
	The estimated future amortization expense related to intangible assets at December 29, 2013, is as follows:
	Fiscal Year	Estimated
		Amortization
		(in thousands)
	2013 (remaining 3 months)	$	1,244
	2014		4,976
	2015		4,976
	2016		4,976
	2017		4,976
	Thereafter		8,103
	Total	$	29,251

Organization_and_Summary_of_Si3

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
	Customer	Customer	Customer	Customer
Accounts Receivable [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Number of major customers	'	'	3	4
Accounts Receivable [Member] | Customer One [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of accounts receivable	25.00%	17.00%	25.00%	17.00%
Accounts Receivable [Member] | Customer Two [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of accounts receivable	23.00%	16.00%	23.00%	16.00%
Accounts Receivable [Member] | Customer Three [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of accounts receivable	12.00%	14.00%	12.00%	14.00%
Accounts Receivable [Member] | Customer Four [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of accounts receivable	'	14.00%	'	14.00%
Sales Revenue, Goods, Net [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Number of major customers	3	3	1	3
Sales Revenue, Goods, Net [Member] | Customer One [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of net revenue	32.00%	24.00%	32.00%	23.00%
Sales Revenue, Goods, Net [Member] | Customer Two [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of net revenue	16.00%	22.00%	'	20.00%
Sales Revenue, Goods, Net [Member] | Customer Three [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of net revenue	10.00%	10.00%	'	13.00%
Maximum [Member]	'	'	'	'
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'
Period of Company's warranty agreements	'	'	'3 years	'

Organization_and_Summary_of_Si4

Organization and Summary of Significant Accounting Policies - Summary of Activity Related to Product Warranty Liability (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Movement In Standard And Extended Product Warranty Increase Decrease [Roll Forward]	'	'
Beginning balance	$123	$361
(Decrease) increase in provision for warranty	-4	-199
Less: actual warranty costs	-30	-32
Ending balance	$89	$130

Organization_and_Summary_of_Si5

Organization and Summary of Significant Accounting Policies - Calculation 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. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Basic and Diluted:	'	'	'	'
Net income (loss)	($12,179)	$16,818	$11,751	$38,133
Basic shares:	'	'	'	'
Weighted average shares used in computing basic net income (loss) per share	87,047	83,218	86,145	82,280
Diluted shares:	'	'	'	'
Weighted average shares used in computing basic net income (loss) per share	87,047	83,218	86,145	82,280
Effect of potentially dilutive securities:	'	'	'	'
Stock options and unvested restricted stock	'	3,964	3,165	4,765
Common stock warrants	'	168	54	187
Weighted average shares used in computing diluted net income (loss) per share	87,047	87,350	89,364	87,232
Net income (loss) per share:	'	'	'	'
Basic	($0.14)	$0.20	$0.14	$0.46
Diluted	($0.14)	$0.19	$0.13	$0.44

Organization_and_Summary_of_Si6

Organization and Summary of Significant Accounting Policies - Securities Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	11,385	4,013	3,752	4,156
Employee Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	9,016	3,423	2,922	4,004
Unvested Restricted Stock Units [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	2,369	590	830	152

Cash_Equivalents_and_Available2

Cash Equivalents and Available-for-sale Investments - Additional Information (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013	Dec. 30, 2012	Apr. 01, 2012	Mar. 31, 2013	Dec. 29, 2013	Mar. 31, 2013	Dec. 29, 2013	Mar. 31, 2013	Dec. 29, 2013	Mar. 31, 2013
					Money Market Funds [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]	Foreign Subsidiaries [Member]	Foreign Subsidiaries [Member]
Cash and Cash Equivalents [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Cash	$14,200,000	$77,900,000	'	'	'	'	'	'	'	'	'
Cash equivalents	26,900,000	'	'	'	22,900,000	'	'	'	'	'	'
Cash and cash equivalents	41,127,000	100,843,000	94,039,000	153,643,000	'	'	'	'	'	12,900,000	60,700,000
Short-term investments available for sale	55,100,000	77,000,000	'	'	'	'	'	'	'	'	'
Long-term investments available for sale	170,100,000	22,400,000	'	'	'	'	'	'	'	'	'
Investments available for sale total	225,200,000	99,400,000	'	'	'	'	'	'	'	'	'
Investment maturity period	'	'	'	'	'	'1 Year	'1 Year	'5 Years	'5 Years	'	'
Transfers of assets measured at fair value between Level 1 and Level 2	$0	$0	'	'	'	'	'	'	'	'	'

Cash_Equivalents_and_Available3

Cash Equivalents and Available-for-sale Investments - Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Financial Statement Classification	'	'
Estimated FMV	$55,056	$77,040
Fair Value, Recurring [Member]	'	'
Investment Class	'	'
Fair value of assets	252,070	122,342
Fair value of assets	252,070	122,342
Financial Statement Classification	'	'
Fair value of assets	252,070	122,342
Amortized Cost	225,308	99,405
Gross Unrealized Gain	6	79
Gross Unrealized Loss	-157	-2
Estimated FMV	225,157	99,482
Fair Value, Recurring [Member] | Cash Equivalents [Member]	'	'
Investment Class	'	'
Fair value of assets	26,913	22,860
Financial Statement Classification	'	'
Fair value of assets	26,913	22,860
Fair value of assets	26,913	22,860
Fair Value, Recurring [Member] | Corporate Notes and Bonds and Municipal Notes and Bonds [Member]	'	'
Financial Statement Classification	'	'
Amortized Cost	212,401	'
Gross Unrealized Gain	'	'
Gross Unrealized Loss	-156	'
Estimated FMV	212,245	'
Fair Value, Recurring [Member] | Commercial Paper [Member]	'	'
Investment Class	'	'
Fair value of assets	'	2,998
Fair value of assets	8,979	'
Fair value of assets	'	2,998
Financial Statement Classification	'	'
Fair value of assets	8,979	'
Fair value of assets	'	2,998
Amortized Cost	8,980	2,997
Gross Unrealized Gain	'	1
Gross Unrealized Loss	-1	'
Estimated FMV	8,979	2,998
Fair value of assets	8,979	'
Fair Value, Recurring [Member] | Municipal Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	3,933	'
Financial Statement Classification	'	'
Fair value of assets	3,933	'
Amortized Cost	3,927	'
Gross Unrealized Gain	6	'
Gross Unrealized Loss	'	'
Estimated FMV	3,933	'
Fair value of assets	3,933	'
Fair Value, Recurring [Member] | Money Market Funds [Member]	'	'
Investment Class	'	'
Fair value of assets	26,913	22,860
Fair value of assets	26,913	22,860
Financial Statement Classification	'	'
Fair value of assets	26,913	22,860
Fair Value, Recurring [Member] | Corporate Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	212,245	94,485
Financial Statement Classification	'	'
Fair value of assets	212,245	94,485
Amortized Cost	'	94,407
Gross Unrealized Gain	'	78
Gross Unrealized Loss	'	'
Estimated FMV	'	94,485
Fair value of assets	212,245	94,485
Fair Value, Recurring [Member] | Short-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	55,057	77,040
Fair value of assets	55,057	77,040
Financial Statement Classification	'	'
Fair value of assets	55,057	77,040
Fair Value, Recurring [Member] | Long-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	170,100	22,442
Fair value of assets	170,100	22,442
Financial Statement Classification	'	'
Fair value of assets	170,100	22,442
Fair Value, Recurring [Member] | U.S. Agency Securities [Member]	'	'
Investment Class	'	'
Fair value of assets	'	1,999
Financial Statement Classification	'	'
Fair value of assets	'	1,999
Amortized Cost	'	2,001
Gross Unrealized Gain	'	'
Gross Unrealized Loss	'	-2
Estimated FMV	'	1,999
Fair value of assets	'	1,999
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member]	'	'
Investment Class	'	'
Fair value of assets	26,913	22,860
Fair value of assets	26,913	22,860
Financial Statement Classification	'	'
Fair value of assets	26,913	22,860
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]	'	'
Investment Class	'	'
Fair value of assets	26,913	22,860
Financial Statement Classification	'	'
Fair value of assets	26,913	22,860
Fair value of assets	26,913	22,860
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Municipal Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]	'	'
Investment Class	'	'
Fair value of assets	26,913	22,860
Fair value of assets	26,913	22,860
Financial Statement Classification	'	'
Fair value of assets	26,913	22,860
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Recurring [Member] | U.S. Agency Securities [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member]	'	'
Investment Class	'	'
Fair value of assets	225,157	99,482
Fair value of assets	225,157	99,482
Financial Statement Classification	'	'
Fair value of assets	225,157	99,482
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member]	'	'
Investment Class	'	'
Fair value of assets	'	2,998
Fair value of assets	8,979	'
Fair value of assets	'	2,998
Financial Statement Classification	'	'
Fair value of assets	8,979	'
Fair value of assets	'	2,998
Fair value of assets	8,979	'
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	3,933	'
Financial Statement Classification	'	'
Fair value of assets	3,933	'
Fair value of assets	3,933	'
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	212,245	94,485
Financial Statement Classification	'	'
Fair value of assets	212,245	94,485
Fair value of assets	212,245	94,485
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	55,057	77,040
Fair value of assets	55,057	77,040
Financial Statement Classification	'	'
Fair value of assets	55,057	77,040
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	170,100	22,442
Fair value of assets	170,100	22,442
Financial Statement Classification	'	'
Fair value of assets	170,100	22,442
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Recurring [Member] | U.S. Agency Securities [Member]	'	'
Investment Class	'	'
Fair value of assets	'	1,999
Financial Statement Classification	'	'
Fair value of assets	'	1,999
Fair value of assets	'	1,999
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Municipal Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Notes and Bonds [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Recurring [Member] | U.S. Agency Securities [Member]	'	'
Investment Class	'	'
Fair value of assets	'	'
Financial Statement Classification	'	'
Fair value of assets	'	'
Fair value of assets	'	'

Balance_Sheet_Details_Inventor

Balance Sheet Details - Inventories (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Work in progress	$43,396	$18,803
Finished goods	15,116	4,959
Total inventories	$58,512	$23,762

Balance_Sheet_Details_Prepaid_

Balance Sheet Details - Prepaid Expenses and Other Current Assets (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]	'	'
Tax receivable	$6,334	$6,374
Other receivable	2,930	87
Prepaid expenses	2,594	2,209
Deferred tax assets	1,035	951
Other current assets	1,863	857
Advance to and receivable from vendors	3,353	2,824
Total prepaid expenses and other current assets	$18,109	$13,302

Balance_Sheet_Details_Addition

Balance Sheet Details - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Balance Sheet Related Disclosures [Abstract]	'	'	'	'
Advance payments to foundry vendors	$0	$0	$800,000	$0
Depreciation and amortization	2,200,000	300,000	3,762,000	1,480,000
New capitalized leases totaled	$0	$0	$0	$0

Balance_Sheet_Details_Property

Balance Sheet Details - Property and Equipment (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Subtotal	$33,451	$15,552
Accumulated depreciation and amortization	-9,796	-6,902
Property and equipment-net	23,655	8,650
Production and Lab Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	22,895	11,654
Computer Equipment and Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	3,483	1,124
Equipment Under Construction [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	4,810	1,851
Leasehold Improvements and Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	$2,263	$923

Balance_Sheet_Details_Accrued_

Balance Sheet Details - Accrued Liabilities (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]	'	'
Estimated Litigation Liability, Current	$14,500	'
Payroll-related expenses	4,283	2,777
Legal fees	3,245	884
Other accrued liabilities	3,541	819
Bonuses	1,874	2,120
Accrued acquisition related costs	1,289	'
Accrued interest payable	384	'
Former CEO separation costs	184	828
Engineering services	293	106
Warranty reserves	89	123
Income tax payable	42	96
Total accrued liabilities	$29,724	$7,753

Balance_Sheet_Details_Accrued_1

Balance Sheet Details - Accrued Liabilities (Parenthetical) (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]	'	'
Former CEO separation costs	$184	$828

Commitments_and_Contingencies_1

Commitments and Contingencies - Future Minimum Lease Payments Under Operating Leases (Detail) (USD $)	Dec. 29, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014 (remainder)	$649
2015	3,124
2016	3,820
2017	3,967
2018	3,961
Beyond	6,926
Total	$22,447

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Rental expense	$1,600,000	$500,000	$3,400,000	$1,500,000
Contributions	'	'	$0	'

Convertible_Senior_Notes_Addit

Convertible Senior Notes - Additional Information (Detail) (USD $)

9 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

Share data in Millions, except Per Share data, unless otherwise specified

Dec. 29, 2013

Nov. 07, 2013

Nov. 07, 2013

Nov. 07, 2013

Dec. 29, 2013

Dec. 29, 2013

Dec. 29, 2013

Dec. 29, 2013

Dec. 29, 2013

Nov. 06, 2013

Dec. 29, 2013

Dec. 29, 2013

Convertible Note Hedges Purchased [Member]

Convertible Note Hedges Purchased [Member]

Warrant Sold [Member]

Equity Component [Member]

Debt Discount [Member]

Other Non-current Assets [Member]

Coupon Rate Plus [Member]

Non-Cash Accretion Expense [Member]

Convertible Senior Notes Due 2018 [Member]

Condition One [Member]

Second Condition [Member]

Hedge_Strategies

D

D

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, Issuance date

6-Nov-13

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, Principal amount

$175,000,000

'

'

'

'

'

'

'

'

$150,000,000

'

'

Convertible senior notes, Maturity date

1-Nov-18

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, Stated interest rate

'

'

'

'

'

'

'

'

'

1.75%

'

'

Proceeds from call option

25,643,000

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, interest payment terms

'The Notes pay interest in cash semi-annually (May and November) at a rate of 1.75% per annum.

'

'

'

'

'

'

'

'

'

'

'

Net proceeds after issuance costs

169,800,000

'

'

'

'

'

'

'

'

'

'

'

Accrued issuance costs

500,000

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, terms of conversion

'On or after August 1, 2018 until the maturity date, the Notes may be converted at the option of the holders. Holders may convert the Notes at their option prior to August 1, 2018 only under the following circumstances: 1) During any calendar quarter commencing after the calendar quarter ending on March 31, 2014 (and only during such calendar quarter), if the last reported sale price of the Companybs common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; 2) During the five business day period after any five consecutive trading day period in which the btrading priceb per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day; or 3) Upon the occurrence of specified corporate events, including if there is a fundamental change.

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, conversion date

1-Aug-18

'

'

'

'

'

'

'

'

'

'

'

Threshold trading days

'

'

'

'

'

'

'

'

'

'

20

5

Threshold consecutive trading days

'

'

'

'

'

'

'

'

'

'

'30 days

'5 days

Threshold percentage of conversion price

'

'

'

'

'

'

'

'

'

'

130.00%

98.00%

Convertible senior notes, face amount per note

1,000

'

'

'

'

'

'

'

'

'

'

1,000

Convertible senior notes, conversion ratio

45.683

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, conversion price

$21.89

'

'

'

'

'

'

'

'

'

'

'

Notes issued

135,700,000

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, debt discount

39,300,000

'

'

'

'

'

'

'

'

'

'

'

Non-convertible debt borrowing rate

7.30%

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, issuance cost

'

'

'

'

2,500,000

3,000,000

250,000

'

'

'

'

'

Convertible senior notes, remaining amortization period

'4 years 10 months 24 days

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, effective interest rate description

'Effective interest rate of the Notes is 7.84% per annum (1.75% coupon rate plus 6.09% of non-cash accretion expense).

'

'

'

'

'

'

'

'

'

'

'

Convertible senior notes, effective interest rate

7.84%

'

'

'

'

'

'

1.75%

6.09%

'

'

'

Call options

'

8

8

8

'

'

'

'

'

'

'

'

Common stock at exercise price

'

21.89

21.89

28.66

'

'

'

'

'

'

'

'

Conversion of shares in convertible note

'

'

0.045683

'

'

'

'

'

'

'

'

'

Aggregate price for convertible note hedge

39,118,000

39,100,000

'

'

'

'

'

'

'

'

'

'

Proceeds from call options

$25,643,000

'

'

$25,600,000

'

'

'

'

'

'

'

'

Convertible_Senior_Notes_Summa

Convertible Senior Notes - Summary of Principal Amounts and Related Unamortized Discount on Notes (Detail) (USD $)	Dec. 29, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
Principal amount of the Note	$175,000
Unamortized discount on the Notes	41,190
Net carrying value	$133,810

Convertible_Senior_Notes_Sched

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to Notes (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 29, 2013
Debt Disclosure [Abstract]	'	'
Contractual coupon interest expense	$394	$394
Amortization of debt discount	1,062	1,062
Amortization of debt issuance costs	7	7
Total interest expense related to the Notes	$1,463	$1,463

Convertible_Senior_Notes_Sched1

Convertible Senior Notes - Schedule of Aggregate Future Principal Debt Maturities (Detail) (USD $)	Dec. 29, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
2014-2017	'
2018	175,000
Total	$175,000

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 29, 2013

Dec. 30, 2012

Dec. 29, 2013

Dec. 30, 2012

Mar. 31, 2013

Dec. 29, 2013

Dec. 29, 2013

Jul. 31, 2011

Dec. 29, 2013

Dec. 29, 2013

Mar. 31, 2013

Dec. 29, 2013

Dec. 30, 2012

Minimum [Member]

2013 Employee Stock Purchase Plan [Member]

2011 Stock Incentive Plan [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Restricted Stock Units and Restricted Stock [Member]

Restricted Stock Units and Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock outstanding percentage

'

'

'

'

'

'

'

4.00%

'

'

'

'

'

Increase and decrease of common stock

'

'

'

'

'

'

'

3,400,000

'

'

'

'

'

Reserved for issuance of shares

18,800,000

'

18,800,000

'

'

'

'

'

'

'

'

'

'

Company's common stock for owners, more than

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

Stock options vesting period

'

'

'

'

'

'

'

'

'

'4 years

'

'

'

Nonqualified stock options may be granted at an exercise price, not less than

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

Common stock, for an exercise price of not less than

'

'

110.00%

'

'

'

'

'

'

'

'

'

'

Stock options expiration period

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

Purchase plan description

'

'

'

'

'

'

'The purchase price of stock under the Purchase Plan is equal to 85% of the lower of (i) the fair market value of the Company's common stock on the first day of each offering period, or (ii) the fair market value of the Company's common stock on the purchase date (as defined in the Purchase Plan). Each offering period consists of one purchase period of approximately six months duration.

'

'

'

'

'

'

Shares purchased

'

'

'

'

'

'

0

'

'

'

'

'

'

Shares were reserved for future issuance under the Purchase Plan

22,150,000

'

22,150,000

'

20,778,000

'

400,000

'

'

'

'

'

'

Aggregate intrinsic value of the stock options exercised

$5.80

$4.70

$28.50

$24.40

'

'

'

'

'

'

'

'

'

Unamortized stock-based compensation expense, reduced for estimated forfeitures and related to non-vested options

19.9

'

19.9

'

18.7

'

'

'

'

'

'

'

'

Unrecognized expense of stock option, period for recognition

'

'

'

'

'

'

'

'

'2 years 10 months 24 days

'

'2 years 10 months 24 days

'3 years 3 months 18 days

'

Total unrecognized compensation cost

'

'

'

'

'

'

'

'

'

'

'

$26

'

Weighted-average grant-date fair value per share

'

'

'

'

'

'

'

'

'

'

'

$15.55

$12.01

Stockholders_Equity_Stock_Opti

Stockholders' Equity - Stock Option Activities (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Options Available for Grant, Beginning Balance	10,198
Options Available for Grant, Increase to stock option pool	3,399
Options Available for Grant, Options granted (weighted-average fair value of $5.76 per share)	-1,460
Options Available for Grant, Options exercised	'
Options Available for Grant, Options canceled	448
Options Available for Grant, Ending Balance	12,585
Options Issued and Outstanding, Beginning Balance	10,495
Options Issued and Outstanding, Options granted (weighted-average fair value of $5.76 per share)	1,460
Options Issued and Outstanding, Options exercised	-2,491
Options Issued and Outstanding, Options canceled	-448
Options Issued and Outstanding, Ending Balance	9,016
Options Issued and Outstanding, Vested and expected to vest	8,210
Options Issued and Outstanding, Exercisable	2,964
Weighted- Average Exercise Price, Beginning Balance	$7.65
Weighted- Average Exercise Price, Options granted	$15.73
Weighted- Average Exercise Price, Options exercised	$4.02
Weighted- Average Exercise Price, Options canceled	$9.70
Weighted- Average Exercise Price, Ending Balance	$9.86
Weighted- Average Exercise Price, Vested and expected to vest	$9.65
Weighted- Average Exercise Price, Exercisable	$6.34
Weighted- Average Remaining Contractual Term (In Years), Beginning Balance	'7 years 5 months 27 days
Weighted- Average Remaining Contractual Term (In Years), Ending Balance	'7 years 11 months 16 days
Weighted- Average Remaining Contractual Term (In Years), Vested and expected to vest	'7 years 10 months 21 days
Weighted- Average Remaining Contractual Term (In Years), Exercisable	'6 years 8 months 5 days
Aggregate Intrinsic Value, Beginning Balance	$38,135
Aggregate Intrinsic Value, Ending Balance	74,250
Aggregate Intrinsic Value, Vested and expected to vest	69,363
Aggregate Intrinsic Value, Exercisable	$34,770

Stockholders_Equity_Stock_Opti1

Stockholders' Equity - Stock Option Activities (Parenthetical) (Detail) (USD $)	9 Months Ended
	Dec. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Weighted-average fair value	$5.76

Stockholders_Equity_WeightedAv

Stockholders' Equity - Weighted-Average Assumptions in Determining Stock-Based Compensation Expense (Detail) (Employee Stock Options [Member])	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Employee Stock Options [Member]	'	'	'	'
Expected Term	'4 years 9 months 18 days	'4 years 3 months 18 days	'4 years 8 months 12 days	'6 years
Volatility	40.50%	46.50%	41.50%	47.70%
Risk-free interest rate	1.00%	0.60%	1.20%	0.90%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Stockholders_Equity_Restricted

Stockholders' Equity - Restricted Stock Unit and Restricted Stock Activity (Detail) (Restricted Stock Units and Restricted Stock [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Restricted Stock Units and Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares Nonvested, Beginning period	806	'
Shares, Granted	1,823	'
Shares, Vested	-147	'
Shares, Forfeited	-113	'
Shares Nonvested, Ending period	2,369	'
Weighted average grant date fair value per share, Nonvested Beginning period	$12.05	'
Weighted average grant date fair value per share, Granted	$15.55	$12.01
Weighted average grant date fair value per share, Vested	$11.89	'
Weighted average grant date fair value per share, Forfeited	$12.70	'
Weighted average grant date fair value per share, Nonvested Ending period	$14.73	'

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Total Stock-Based Compensation Cost (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$4,719	$2,757	$10,896	$6,449
Cost of Revenue [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	349	191	845	522
Research and Development [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	1,665	752	3,941	2,075
Selling, General and Administrative [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Total stock-based compensation expense	$2,705	$1,814	$6,110	$3,852

Stockholders_Equity_Common_Sto

Stockholders' Equity - Common Stock Reserved for Future Issuances (Detail)	Dec. 29, 2013	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	22,150,000	20,684,000
Warrants to purchase common stock	'	94,000
Total common stock reserved for future issuances	22,150,000	20,778,000
Employee Stock Options [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	9,016,000	10,495,000
Restricted Stock Units and Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	2,369,000	806,000
Reserved for Future Equity Incentive Grants [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	10,765,000	9,383,000

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Income Tax Examination [Line Items]	'	'	'	'
Income tax provision (benefit)	($2,599,000)	($654,000)	$1,154,000	$5,023,000
Uncertain tax positions within Long-term liabilities	9,300,000	'	9,300,000	'
Uncertain tax provision	500,000	'	2,400,000	'
Foreign Income Taxes [Member]	'	'	'	'
Income Tax Examination [Line Items]	'	'	'	'
Uncertain tax provision	$1,000,000	'	'	'

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Dec. 29, 2013	Dec. 29, 2013
Business Acquisition [Line Items]	'	'	'
Business acquisition, purchase price	$100,000,000	'	'
Business acquisition, contingent future expense reimbursements	2,200,000	'	'
Business acquisition, contingent cash payment	70,000,000	'	'
Business acquisition, fair value of contingent consideration	0	'	'
Acquisition related costs	'	2,000,000	2,100,000
Fair value of intangible assets	37,400,000	'	'
Developed Technology [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Fair value of intangible assets	28,520,000	'	'
Estimated useful life of intangible assets	'6 years	'	'
Customer Relationships [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Fair value of intangible assets	$1,560,000	'	'
Estimated useful life of intangible assets	'7 years	'	'

Acquisition_Summary_of_Prelimi

Acquisition - Summary of Preliminary Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $)	Dec. 29, 2013	Oct. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Assets Acquired	'	'	'
Inventories	'	$5,107	'
Property and equipment, net	'	4,193	'
Intangible assets	'	37,400	'
Goodwill	51,098	51,098	'
Total assets acquired	'	97,808	'
Total purchase price (net of $2.2 million of contingent expense reimbursements)	'	97,808	'
Developed Technology [Member]	'	'	'
Assets Acquired	'	'	'
Intangible assets	'	28,520	'
In-Process Research & Development [Member]	'	'	'
Assets Acquired	'	'	'
Intangible assets	'	7,330	'
Customer Relationships [Member]	'	'	'
Assets Acquired	'	'	'
Intangible assets	'	$1,560	'

Acquisition_Summary_of_Prelimi1

Acquisition - Summary of Preliminary Purchase Price of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013
Business Combinations [Abstract]	'
Contingent expense reimbursements	$2.20

Acquisition_Summary_of_Fair_Va

Acquisition - Summary of Fair Value and Estimated Useful Lives of Intangible Assets (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'
Fair Value Amount	$37,400
Developed Technology [Member]	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Fair Value Amount	28,520
Estimated Useful Life	'6 years
Customer Relationships [Member]	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Fair Value Amount	$1,560
Estimated Useful Life	'7 years

Acquisition_Summary_of_Unaudit

Acquisition - Summary of Unaudited Proforma of Combined Financial Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Business Combinations [Abstract]	'	'
Revenues	$217,593	$208,709
Net income	$9,683	$38,663

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Dec. 29, 2013	Dec. 29, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Changes in carrying amount of goodwill	'	$0
Amortization for acquired intangible assets	$800,000	$800,000

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	Dec. 29, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets , Gross	$30,080	'
Intangible assets, Accumulated Amortization	829	'
Intangible assets, net	36,598	'
Developed Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets , Gross	28,520	'
Intangible assets, Accumulated Amortization	792	'
Intangible assets, net	27,728	'
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets , Gross	1,560	'
Intangible assets, Accumulated Amortization	37	'
Intangible assets, net	$1,523	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)	Dec. 29, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'
2013 (remaining 3 months)	$1,244
2014	4,976
2015	4,976
2016	4,976
2017	4,976
Thereafter	8,103
Intangible assets, Net	$29,251

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended	9 Months Ended
	14-May-13	Mar. 11, 2013	Dec. 29, 2013	Dec. 29, 2013	Feb. 09, 2014
	Patents	Patents		Claim	Subsequent Events [Member]
Minimum number of claims of Asserted Patents	'	'	'	1	'
Number of infringed patents under examination	'	5	'	'	'
Number of infringed patents under examination previously asserted	'	3	'	'	'
Number of infringed new patents under examination	'	2	'	'	'
Number of asserted patents being examined	3	'	'	'	'
Proposal to enter into a limited cross license to settle outstanding litigation	'	'	'	'	$15
Litigation settlement, pre-tax charge recognized	'	'	$14.50	'	'