InvenSense Inactive 10-Q31 Oct 142015 Q2 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
Document and Entity Information	Sep. 28, 2014	Oct. 24, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	28-Sep-14	'
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'INVN	'
Entity Registrant Name	'InvenSense Inc	'
Entity Central Index Key	'0001294924	'
Current Fiscal Year End Date	'--03-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	90,060,000

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Current assets:	'	'
Cash and cash equivalents	$38,424	$26,025
Short-term investments	86,629	91,307
Accounts receivable	67,045	39,009
Inventories	75,011	73,032
Prepaid expenses and other current assets	21,447	19,587
Total current assets	288,556	248,960
Property and equipment, net	42,397	25,239
Intangible assets, net	47,495	35,360
Goodwill	139,175	50,952
Long-term investments	34,963	128,755
Other assets	7,332	5,469
Total assets	559,918	494,735
Current liabilities:	'	'
Accounts payable	28,337	18,964
Accrued liabilities	36,086	14,985
Total current liabilities	64,423	33,949
Long-term debt	139,230	135,583
Other long-term liabilities	28,046	11,375
Total liabilities	231,699	180,907
Commitments and contingencies (Note 4)	'	'
Preferred stock:	'	'
Preferred stock, $0.001 par value - 20,000 shares authorized, no shares issued and outstanding at September 28, 2014 and March 30, 2014	'	'
Common stock:	'	'
Common stock, $0.001 par value - 750,000 shares authorized, 89,756 shares issued and outstanding at September 28, 2014, 88,332 shares issued and outstanding at March 30, 2014	242,010	215,958
Accumulated other comprehensive income (loss)	1	-38
Retained earnings	86,208	97,908
Total stockholders' equity	328,219	313,828
Total liabilities and stockholders' equity	$559,918	$494,735

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
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	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	750,000	750,000
Common stock, shares issued	89,756	88,332
Common stock, shares outstanding	89,756	88,332

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Income Statement [Abstract]	'	'	'	'
Net revenue	$90,195	$70,941	$156,876	$126,851
Costs of revenue	58,854	34,364	94,359	60,955
Gross profit	31,341	36,577	62,517	65,896
Operating expenses:	'	'	'	'
Research and development	21,593	9,810	41,001	17,924
Selling, general and administrative	14,592	11,424	28,510	20,580
Total operating expenses	36,185	21,234	69,511	38,504
Income (loss) from operations	-4,844	15,343	-6,994	27,392
Interest expense	-2,620	'	-5,204	'
Other income, net	1,199	210	1,380	291
Income (loss) before income taxes	-6,265	15,553	-10,818	27,683
Income tax provision	603	1,945	882	3,753
Net income (loss)	($6,868)	$13,608	($11,700)	$23,930
Net income (loss) per share of common stock:	'	'	'	'
Basic	($0.08)	$0.16	($0.13)	$0.28
Diluted	($0.08)	$0.15	($0.13)	$0.27
Shares used in computing net income (loss) per share of common stock:	'	'	'	'
Basic	88,997	86,289	88,650	85,658
Diluted	88,997	89,778	88,650	88,841

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	($6,868)	$13,608	($11,700)	$23,930
Other comprehensive income (loss):	'	'	'	'
Unrealized gain (loss) on available-for-sale securities, net of tax	-52	26	39	91
Comprehensive income (loss)	($6,920)	$13,634	($11,661)	$24,021

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013
Cash flows from operating activities:	'	'
Net income (loss)	($11,700)	$23,930
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
Depreciation	4,310	1,524
Amortization of intangible assets	2,895	'
Write-off of in-process research and development	770	'
Loss on disposal of property and equipment	326	'
Gain on equity investment	-890	'
Stock-based compensation expense	14,637	6,177
Deferred income tax assets	25	-5
Tax effect of employee benefit plan	'	3,231
Excess tax benefit from stock-based compensation	'	-3,231
Non cash interest expense	3,672	'
Changes in operating assets and liabilities:	'	'
Accounts receivable	-27,298	-5,468
Inventories	-1,978	-14,707
Prepaid expenses and other assets	54	-485
Other assets	-1,100	-63
Accounts payable	5,398	765
Accrued liabilities	8,130	4,789
Net cash provided by (used in) operating activities	-2,749	16,457
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	-71,446	'
Purchase of property and equipment	-17,624	-9,805
Sales and maturities of available-for-sale investments	98,528	46,197
Purchase of available-for-sale investments	'	-46,345
Net cash provided by (used in) investing activities	9,458	-9,953
Cash flows from financing activities:	'	'
Proceeds from the issuance of common stock	5,694	7,611
Repayment of capital leases	-4	-6
Excess tax benefit from stock-based compensation	'	3,231
Net cash provided by financing activities	5,690	10,836
Net increase in cash and cash equivalents	12,399	17,340
Cash and cash equivalents:	'	'
Beginning of period	26,025	100,843
End of period	38,424	118,183
Supplemental disclosures of cash flow information:	'	'
Cash paid for interest	1,429	'
Cash received (paid) for income taxes	-186	3,329
Noncash investing and financing activities:	'	'
Unpaid purchases of property and equipment	5,681	1,591
Unpaid contingent consideration from business acquisition	16,034	'
Unrealized gain from available-for-sale investments	2	109
Proceeds receivable from the exercise of stock options	$81	$24

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	6 Months Ended
Organization and Summary of Significant Accounting Policies	Sep. 28, 2014
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 Micro-Electro-Mechanical Systems (“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 30, 2014 included in the Company’s Annual Report on Form 10-K filed on May 29, 2014 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 30, 2014.
	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.
	Basis of Consolidation
	The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and include our accounts and the accounts of our wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in 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 operations.
	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 fiscal year (“Fiscal 2014”) ended on March 30, 2014 (“March 2014”). The second fiscal quarter in each of the two most recent fiscal years ended on September 28, 2014 (“three months ended September 28, 2014” or “September 2014”) and September 29, 2013 (“three months ended September 29, 2013” or “September 2013”), respectively, and each quarter period included 13 weeks.

	Use of Estimates
	The preparation of the Company’s Condensed Consolidated Financial Statements and related Notes in conformity with accounting principles generally accepted in the United States of America (U.S. 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 Condensed Consolidated Financial Statements and related Notes and the reported amounts of income and expenses during the reporting period. Significant estimates included in the Consolidated Financial Statements and related Notes include income taxes, inventory valuation, stock-based compensation, loss contingencies, warranty reserves, valuation of acquired assets and contingent consideration, and valuation of convertible senior notes, including the related convertible notes hedges and warrants. 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 September 28, 2014, two customers accounted for 55% and 12% of accounts receivable. At March 30, 2014, three customers accounted for 28%, 19% and 19% of accounts receivable.
	For the three months ended September 28, 2014, two customers accounted for 29% and 26% of net revenue. For the six months ended September 28, 2014, three customers accounted for 30%, 17% and 10% of net revenue. For the three months ended September 29, 2013, two customers accounted for 36% and 14% of net revenue. For the six months ended September 29, 2013, one customer accounted for 31% of net revenue.
	Warranty
	The Company’s warranty agreements are contract and component specific and can be for a period of up to three years after shipment for selected components. The accrual includes management’s judgment regarding anticipated rates of warranty claims and associated repair costs. The following table summarizes the activity related to product warranty liability during the six months ended September 28, 2014 and September 29, 2013:


			Six Months Ended
			September 28,				September 29,
			2014				2013
			(in thousands)
	Beginning balance		$	80			$	123
	Provision for warranty			103				197
	Adjustments related to changes in estimate			(96	)			(203	)
	Less: actual warranty costs			(15	)			(16	)

	Ending balance		$	72			$	101


	Net Income (Loss) Per Share
	Basic net income (loss) per share is computed by dividing net income (loss) 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 (loss) 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.
	The following table presents the calculation of basic and diluted net income (loss) per share:


			Three Months Ended								Six Months Ended
			September 28,				September 29,				September 28,				September 29,
			2014				2013				2014				2013
			(in thousands, except per share data)
	Numerator:
	Basic and Diluted
	Net income (loss)		$	(6,868	)		$	13,608			$	(11,700	)		$	23,930

	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income (loss) per share			88,997				86,289				88,650				85,658

	Diluted shares:
	Weighted-average shares used in computing basic net income (loss) per share			88,997				86,289				88,650				85,658
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock			—				3,405				—				3,101
	Common stock warrants			—				84				—				82

	Weighted-average shares used in computing diluted net income (loss) per share			88,997				89,778				88,650				88,841

	Net income (loss) per share
	Basic		$	(0.08	)		$	0.16			$	(0.13	)		$	0.28
	Diluted		$	(0.08	)		$	0.15			$	(0.13	)		$	0.27
	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								Six Months Ended
		September 28,				September 29,				September 28,				September 29,
		2014				2013				2014				2013
		(in thousands)
Employee stock options			8,665				1,644				8,635				4,418
Unvested restricted stock units			3,660				250				3,537				589

Total antidilutive securities			12,325				1,894				12,172				5,007


Recent Accounting Pronouncements
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU No. 2014-09 provides guidance that companies will recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the payment to which a company expects to be entitled in exchange for those goods or services. The Company will be required to implement the new revenue recognition standard for the first quarter of fiscal year 2018. The Company is currently evaluating the impact on its consolidated financial statements.

Cash_Equivalents_and_Available

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments	6 Months Ended
	Sep. 28, 2014
Text Block [Abstract]	'
Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments	'

	2. Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments

	At September 28, 2014, of the $38.4 million of the Company’s cash and cash equivalents, $35.3 million was cash and $3.1 million was cash equivalents invested in money market funds and commercial paper. At September 28, 2014, $34.7 million of the $38.4 million of cash and cash equivalents were held by our foreign subsidiaries. If these funds are needed for our operations in the United States, the Company would be required to accrue and pay U.S. taxes to repatriate these funds. However, the Company’s intent is to indefinitely reinvest these funds outside of the United States, and the Company’s current plans for the foreseeable future do not demonstrate a need to repatriate them to fund U.S. operations. Additionally, as of September 28, 2014, the Company had short-term available-for-sale investments of $86.6 million and long-term available-for-sale investments of $35.0 million totaling $121.6 million. Long-term investments as of September 28, 2014 of $35.0 million had scheduled maturities between one and two years from the balance sheet date.

	At March 30, 2014, of the $26.0 million of the Company’s cash and cash equivalents, $15.3 million was cash and $10.7 million was cash equivalents invested in money market funds. At March 30, 2014, $9.8 million of the $26.0 million of cash and cash equivalents were held by our foreign subsidiaries. As of March 30, 2014, the Company had short-term available-for-sale investments of $91.3 million and long-term available-for-sale investments of $128.8 million totaling $220.1 million which was held in the US entity. Long-term investments as of March 30, 2014 of $128.8 million had scheduled maturities between one and two 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:

	September 28, 2014:

	Assets and liabilities measured at fair value on a recurring basis were presented in the Company’s condensed consolidated balance sheet as of September 28, 2014.



			September 28, 2014			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)
	Assets
	Money Market Funds		$	3,151		$	3,151		$	—			$	—
	Corporate Notes and Bonds			117,448			—			117,448				—
	Municipal Notes and Bonds			1,644			—			1,644				—
	U.S. Agency Securities			2,500			—			2,500				—

	Total investments		$	124,743		$	3,151		$	121,592			$	—

	Liabilities
	Contingent consideration		$	16,034									$	16,034

	Assets
	Cash equivalents		$	3,151		$	3,151		$	—			$	—
	Short-term investments			86,629			—			86,629				—
	Long-term investments			34,963			—			34,963				—

	Total investments		$	124,743		$	3,151		$	121,592			$	—

	Liabilities
	Accrued liabilities		$	13,308									$	13,308
	Long-term liabilities			2,726										2,726

	Total contingent consideration		$	16,034		$	—		$	—			$	16,034




			September 28, 2014			Gross			Gross				September 28, 2014
Amortized Cost			Unrealized			Unrealized			Estimated FMV
			Gain			Loss
Corporate Notes and Bonds			$	117,449		$	38		$	(39	)		$	117,448
Municipal Notes and Bonds				1,642			2			—				1,644
U.S. Agency Securities			2,500			—			—				2,500

Total Available-for-sale investments		$	121,591		$	40		$	(39	)		$	121,592

Cash equivalents													3,151

Total Aggregate Fair Value												$	124,743


Level 1 and 2 financial assets:

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, commercial paper, municipal notes and bonds and U.S. Agency Securities were derived from non-binding market consensus prices that are corroborated by observable market data.



Level 3 financial liabilities:

The following table provides a summary of changes in fair value of the Company’s contingent consideration categorized as Level 3 for the six months ended September 28, 2014:



		Six Months Ended
		September 28, 2014
		(in thousands)
Beginning balance		$	—
Add: Contingent consideration in connection with acquisitions			16,034

Ending balance		$	16,034


Contingent consideration on acquired businesses (See Note 8) was measured at fair value using Level 3 inputs as defined in the fair value hierarchy. The following table presents certain information about the significant unobservable inputs used in the fair value measurement for the contingent consideration measured at fair value on a recurring basis using significant unobservable inputs:



Description		Valuation Techniques		Significant Unobservable Inputs
Liabilities: Contingent consideration		Present value of a Probability Weighted Earn-out model using an appropriate discount rate.		Estimate of meeting the milestones.

An increase in the estimate of probability of meeting the milestones could result in a significantly higher estimated fair value of the contingent consideration liability. Alternatively, a decrease in the estimate of probability of meeting the milestones could result in a significantly lower estimated fair value of contingent consideration liability.

The fair value of contingent consideration was derived from a probability weighted earn-out model of future contingent payments. The cash payments are expected to be made upon meeting the milestones (See Note 8). The valuation of the contingent consideration was based on a collaborative effort of the Company’s engineering and finance departments, and third party valuation experts. The estimate of meeting the milestones and discount rates will be reviewed quarterly and updated as and when necessary. Potential valuation adjustments will be made to adjust the contingent consideration payments. These adjustments will be recorded in the statements of operations.

There were no transfers of assets measured at fair value between Level 1 and Level 2 during the six months ended September 28, 2014.



March 30, 2014:

Assets measured at fair value on a recurring basis were presented in the Company’s consolidated balance sheet as of March 30, 2014.



		March 30,			Quoted Prices			Significant				Significant
		2014			in Active			Other				Other
		Balance			Markets for			Observable				Unobservable
					Identical			Inputs				Inputs
					Assets Level 1			Level 2				Level 3
		(in thousands)
Money Market Funds		$	10,657		$	10,657		$	—			$	—
Corporate Notes and Bonds			204,683			—			204,683				—
Municipal Notes and Bonds			3,895			—			3,895				—
Commercial Paper			8,988			—			8,988				—
U.S. Agency Securities			2,496			—			2,496				—

Total		$	230,719		$	10,657		$	220,062			$	—

Cash equivalents		$	10,657		$	10,657		$	—			$	—
Short-term investments			91,307			—			91,307				—
Long-term investments			128,755			—			128,755				—

Total		$	230,719		$	10,657		$	220,062			$




		March 30,			Gross			Gross				March 30,
		2014			Unrealized			Unrealized				2014
		Amortized Cost			Gain			Loss				Estimated FMV
		(in thousands)
Corporate Notes and Bonds		$	204,747		$	—		$	(64	)		$	204,683
Municipal Notes and Bonds			3,888			7			—				3,895
Commercial Paper			8,986			2			—				8,988
U.S. Agency Securities			2,500			—			(4	)			2,496

Total Available-for-sale investments		$	220,121		$	9		$	(68	)		$	220,062

Cash equivalents													10,657

Total Aggregate Fair Value												$	230,719


There were no transfers of assets measured at fair value between Level 1 and Level 2 during Fiscal 2014.

Balance_Sheet_Details

Balance Sheet Details	6 Months Ended
Balance Sheet Details	Sep. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Balance Sheet Details	'
	3. Balance Sheet Details
	Inventories
	Inventories at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Work in process	$	55,258		$	58,641
	Finished goods		19,753			14,391

	Total inventories	$	75,011		$	73,032


	Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014
		(in thousands)
	Prepaid expenses	$	3,375		$	3,495
	Income tax receivable		8,712			5,932
	Other receivables		5,076			5,356
	Deferred tax assets		2,508			2,487
	Advance to vendors		414			1,026
	Other current assets		1,362			1,291

	Total prepaid expenses and other current assets	$	21,447		$	19,587

	Property and Equipment
	Property and equipment at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Production and lab equipment	$	34,183		$	25,890
	Computer equipment and software		5,505			4,335
	Equipment under construction		12,055			2,298
	Leasehold improvements and furniture and fixtures		5,944			3,918

	Subtotal		57,687			36,441
	Accumulated depreciation and amortization		(15,290	)		(11,202	)

	Property and equipment — net	$	42,397		$	25,239

	Depreciation expense for the three and six months ended September 28, 2014 was $2.6 million and $4.3 million, respectively. Depreciation expense for the three and six months ended September 29, 2013 was $0.8 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 2015.
	Accrued Liabilities
	Accrued liabilities at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Contingent consideration	$	13,349		$	—
	Payroll-related expenses		7,103			4,207
	Bonuses		3,194			3,019
	Legal fees		1,139			2,527
	Accrued contractual coupon interest payable on convertible senior notes		1,256			1,158
	Deferred revenue		954			800
	Income tax payable		177			117
	Other accrued liabilities		8,914			3,157

	Total accrued liabilities	$	36,086		$	14,985

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Sep. 28, 2014
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 September 28, 2014 are as follows:


		Amount
		(in thousands)
	Fiscal Years Ending:
	2015 (remainder)	$	2,340
	2016		5,878
	2017		5,970
	2018		5,877
	2019		5,991
	Beyond		6,133

	Total	$	32,189

	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 $1.2 million and $2.3 million for the three and six months ended September 28, 2014, respectively. The Company’s rental expense under operating leases was approximately $1.2 million and $1.8 million for the three and six months ended September 29, 2013, respectively.
	Legal Proceedings
	From time to time the Company is involved in litigation that the Company believes is of the type common to companies engaged in our line of business, including intellectual property and employment issues. Regardless of the merit or resolution of any such litigation, complex intellectual property litigation is generally costly and can divert the efforts and attention of our management and technical personnel.

Convertible_Senior_Notes

Convertible Senior Notes	6 Months Ended
Convertible Senior Notes	Sep. 28, 2014
Debt Disclosure [Abstract]	'
Convertible Senior Notes	'
	5. Convertible Senior Notes
	In November 2013, the Company issued $175.0 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 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 $169.3 million.
	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 $169.3 million from the offering of the Notes (after the issuance costs) for general corporate purposes, including to replace cash used for business acquisitions (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 September 28, 2014 the remaining amortization period of the debt discount and the issuance costs is 4.1 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 Notes 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 consolidated balance sheets.
	The following table summarizes the principal amounts and related unamortized discount on the Notes:


		September 28, 2014
		(in thousands)
	Principal amount of the Notes	$	175,000
	Unamortized discount on the Notes		35,770

	Net carrying value	$	139,230

	The following table presents the amount of interest expense recognized related to the Notes for the three and six months ended September 28, 2014:


		Three Months Ended		Six Months Ended
		September 28, 2014		September 28, 2014
		(in thousands)
	Contractual coupon interest expense	$	764	$	1,532
	Accretion of debt discount		1,843		3,647
	Amortization of debt issuance costs		13		25

	Total interest expense related to the Notes	$	2,620	$	5,204

	As of September 28, 2014, our aggregate future principal debt maturities are as follows (in thousands):


	Fiscal Year	September 28, 2014
		(in thousands)
	2015-2018	$	—
	2019		175,000

	Total	$	175,000


	The convertible notes issued by the Company in November 2013 are shown in the accompanying consolidated balance sheets at their original issuance value, net of unamortized discount, and are not marked to market each period. The approximate fair value of the convertible notes as of September 28, 2014 was $195.4 million. The fair value of the convertible notes was determined using quoted market prices for similar securities, which, due to limited trading activity, are considered Level 2 in the fair value hierarchy.

Stockholders_Equity

Stockholders' Equity	6 Months Ended
Stockholders' Equity	Sep. 28, 2014
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, beginning with the Company’s fiscal year following the year of this offering, 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 3.5 million shares for fiscal year 2015.

	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.

	Incentive stock options may only be granted to employees and at an exercise price of no less than 100% of 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 are subject to repurchase. Stock options vest over the period determined by the Board of Directors, generally four years.

	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)
	Outstanding — March 30, 2014			12,595				8,276			$	10.37				7.87		$	102,072
	Increase to stock option pool			3,533				—				—
	Options granted (weighted-average fair value of $7.33 per share)			(1,500	)			1,500				20.19
	Exercised options							(825	)			6.49
	Cancelled options			214				(214	)			12.47

	Outstanding — September 28, 2014			14,842				8,737			$	12.37				7.85		$	68,491

	Vested and expected to vest — September 28, 2014							7,404			$	11.74				7.67		$	62,434
	Vested — September 28, 2014							3,224			$	8.68				6.76		$	36,299



	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 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 six months ended September 28, 2014 was $11.2 million and $14.1 million respectively. The aggregate intrinsic value of the stock options exercised during the three and six months ended September 29, 2013 was $11.3 million and $22.8 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 $18.3 million, and $20.7 million at September 28, 2014 and September 29, 2013, respectively, and will be amortized over a weighted-average remaining period of approximately 2.6 and 3.1 years, respectively. Total unrecognized expense will be adjusted for future changes in estimated forfeitures.

	The Company used the following weighted-average assumptions in determining stock-based compensation expense for options granted in the three and six months ended September 28, 2014 and September 29, 2013.



			Three Months Ended								Six Months Ended
			September 28,				September 29,				September 28,				September 29,
			2014				2013				2014				2013
	Dividend rate			0	%			0	%			0	%			0	%
	Risk-free interest rate			1.5	%			1.5	%			1.4	%			1.2	%
	Expected life (in years)			4.6				4.7				4.5				4.7
	Expected volatility			41.4	%			41.9	%			41.7	%			41.7	%

	Restricted Stock Units and Restricted Stock

	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows:



	Restricted stock units and restricted stock activities		Shares				Weighted Average
							Grant Date Fair
							Value Per Share
		(in thousands, except per share amount)
Unvested at March 30, 2014			3,325			$	16.63
Granted			1,048				21.84
Released			(378	)			13.93
Forfeited			(99	)			16.64

Unvested at September 28, 2014			3,896			$	18.29




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 September 28, 2014, there was approximately $43.6 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 3.2 years. The weighted-average grant-date fair value per share of restricted stock units and restricted stock awarded in the six months ended September 28, 2014 and September 29, 2013 was $21.84 and $14.69, respectively.

Common Stock

As of September 28, 2014 and March 30, 2014, common stock reserved for future issuance was as follows:



Common stock reserved for issuance		September 2014				March 2014,
		(in thousands)
Stock plans
Outstanding stock options			8,737				8,276
Outstanding restricted stock units and restricted stocks			3,896				3,325
Reserved for future equity incentive grants			10,995				9,697

			23,628				21,298
Purchase plan			339				400
Warrants to purchase common stock			8,000				7,995

Total common stock reserved for future issuances			31,967				29,693


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 September 28, 2014, 61,000 shares had been purchased.

Stock-Based Compensation Expense

Total employee stock-based compensation costs for the Company’s stock plans for the three and six months ended September 28, 2014 and September 29, 2013 are as follows:



		Three Months Ended								Six Months Ended
		September 28,				September 29,				September 28,				September 29,
		2014				2013				2014				2013
		(in thousands)
Cost of revenue		$	654			$	259			$	1,311			$	495
Research and development			3,197				1,204				6,715				2,277
Selling, general and administrative			3,151				1,897				6,611				3,405

Total stock-based compensation expense		$	7,002			$	3,360			$	14,637			$	6,177

Income_Taxes

Income Taxes	6 Months Ended
Income Taxes	Sep. 28, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	In the three and six months ended September 28, 2014, the Company recorded an income tax provision of $0.6 million and $0.9 million respectively. In the three and six months ended September 30, 2013, the Company recorded an income tax provision of $1.9 million and $3.8 million respectively. The Company’s estimated 2015 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, Massachusetts 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 September 28, 2014 because such earnings are to be reinvested indefinitely.
	The Company has recorded $10.5 million of uncertain tax positions within “Other long-term liabilities” on the condensed consolidated balance sheet as at September 28, 2014. The Company does not expect any significant increases or decreases to its unrecognized tax benefits within the next twelve months. 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.
	The Company’s tax year from 2003 and onwards could be subject to examinations by tax authorities in one or more tax jurisdictions. The Internal Revenue Service (the “IRS”) is currently examining the fiscal years 2011 through 2013. In addition, the Company is subject to audits by state, local, and foreign tax authorities. Management believes that adequate provisions have been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company’s tax audits are resolved in a manner not consistent with management’s expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs.

Business_Combination

Business Combination	6 Months Ended
Business Combination	Sep. 28, 2014
Business Combinations [Abstract]	'
Business Combination	'
	8. Business Combination
	Movea S.A
	On July 22, 2014, the Company acquired 100% equity interest of Movea, a company formed under the laws of France, and a leading provider of software for ultra-low power location, activity tracking and context sensing. The acquisition of Movea further scales the Company’s leadership in motion software.
	The Company paid $60.9 million in cash as consideration for the acquisition and could pay an additional $13.0 million in cash contingent upon the achievement of certain milestones within one year of the acquisition.
	In addition, the Company, under its 2011 Stock Incentive Plan granted restricted stock units (RSU), with a fair value of $6.6 million, to certain Movea employees. The RSUs will vest over a 5 year requisite service period.

	The table below is a summary of the preliminary purchase price allocation of the fair value of assets acquired and liabilities assumed in connection with the acquisition of Movea (in thousands):


	Cash consideration		$	60,900
	Contingent consideration			8,400

			$	69,300

	Preliminary allocation of purchase price:
	Current assets		$	3,082
	Fixed assets			209
	Other non-current assets			592
	Developed technology			7,200
	Goodwill			68,330
	Current liabilities			(5,016	)
	Long-term liabilities			(5,097	)

	Total preliminary purchase price		$	69,300

	The purchase price includes contingent considerations of (i) $8.0 million payable in cash to the former Movea shareholders upon a design win with a major smartphone manufacturer within one year of closing date, and (ii) $5.0 million payable in cash to the former Movea shareholders upon a specific product development milestone by December 2014. The fair value of the contingent consideration of $8.4 million was derived from a probability weighted earn-out model of future contingent payments.
	The purchase price exceeded the fair value of the net tangible and identifiable intangible assets acquired and, as a result, the Company recorded goodwill in connection with this transaction. The acquisition will provide assembled workforce and synergy with other of the Company’s offerings. These factors primarily contributed to a purchase price that resulted in goodwill.
	The following table presents certain information on acquired identifiable intangible assets related to the Movea acquisition:


			Estimated Fair Value				Estimated Useful Life
			(in thousands)				(in years)
	Developed technology		$	7,200				5
	The fair value of developed technology was determined using a cost approach, which includes an estimate of time and expenses required to recreate the intangible asset. 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 revenue over the estimated useful life of 5 years.
	Unaudited Pro Forma Financial Information
	The following unaudited pro forma financial information presents the combined results of operations of InvenSense and Movea as if the acquisition had occurred as of the beginning of fiscal 2014:


			Three Months Ended						Six Months Ended
			September 28,				September 29,		September 28,			September 29,
			2014				2013		2014			2013
	Net revenue		$	90,368			$	71,603	$	157,550		$	128,274
	Net income (loss)		$	(7,305	)		$	11,307	$	(14,717	)	$	19,255
	The unaudited pro forma financial information should not be taken as representative of our future consolidated results of operations or financial condition.

	Trusted Positioning, Inc.
	On August 29, 2014, the Company completed the acquisition of Trusted Positioning, Inc., (“TPI”), a Canadian corporation, which is an indoor/outdoor positioning software company with the vision to provide ‘Positioning Everywhere’. The acquisition of TPI, particularly its advanced location tracking software, strengthens the Company’s position as a provider of intelligent sensor System on Chips (SoC) for the fast growing mobile market.
	The Company’s acquisition of TPI was completed through a step acquisition. In fiscal 2014, the Company made investments totaling $0.3 million to own approximately 4.57% of TPI’s outstanding common stock. On August 29, 2014, the Company purchased the remaining outstanding common stock of TPI for a total consideration of $26.1 million. The total purchase price, as presented in the table below, consists of (i) cash of $11.5 million (ii) issuance of 236,000 shares of the Company’s common stock with a fair value of $5.7 million (iii) contingent considerations with a combined fair value of $7.6 million payable upon TPI’s achievement of certain product development milestones, and (iv) initial investments with a fair value of $1.2 million.
	In addition, the Company, under its 2011 Stock Incentive Plan, granted equity awards (restricted stock units and stock options), to certain TPI employees with an aggregate fair value of $5.0 million. The equity awards will vest over a 5 year requisite service period.
	The table below is a summary of the preliminary purchase price allocation for the 100% equity interest of the fair value of assets acquired and liabilities assumed in connection with the acquisition of TPI (in thousands):


	Cash consideration		$	11,499
	Issuance of common stock			5,703
	Contingent consideration			7,634
	Fair value of previously held 4.57% equity interest			1,215

			$	26,051

	Preliminary allocation of purchase price:
	Current assets		$	512
	Fixed assets			50
	Other non-current assets			546
Developed technology			8,600
Goodwill			19,893
Current liabilities			(1,247	)
Long-term liabilities			(2,303	)

Total preliminary purchase price		$	26,051

The purchase price includes contingent consideration comprised of (i) $5 million payable upon a design win within one year of acquisition, (ii) $3 million payable upon achieving a development milestone by December 2014, (iii) $2 million payable upon successful development of cloud application within two years of acquisition and (iv) $2 million upon first deployment of cloud application which is expected within one year of successful development of cloud application. The contingent considerations, which was derived from a probability weighted earn-out model of future contingent payments, have a combined fair value of $7.6 million, of which $4.9 million was recorded in accrued liabilities and $2.7 million was recorded in other long-term liabilities.
The following table presents certain information on acquired identifiable intangible assets related to the TPI acquisition:


		Estimated Fair Value				Estimated Useful Life
		(in thousands)				(in years)
Developed technology		$	8,600			5

The fair value of developed technology was determined using a cost approach, which includes an estimate of time and expenses required to recreate the intangible asset. 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 revenue over the estimated useful life of 5 years.
In connection with the acquisition of TPI, the Company recorded a non-cash gain of approximately $0.9 million resulting from the difference between carrying value of its initial investments in TPI of $0.3 million and fair value of such investments of $1.2 million, as of the acquisition date. This non-cash gain is recorded in “Other income, net” on the Condensed Consolidated Statement of Operations.
MEMS Microphone Business of Analog Devices, Inc.
In the third quarter of fiscal 2014, the Company acquired certain assets relating to Analog Devices, Inc. (“ADI”) 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 within one year of the transaction close date. 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 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 allocation of the purchase price of the assets acquired and liabilities assumed based on their fair values was as follows:


		Total Amount
		(in thousands)
Inventories		$	5,107
Property and equipment, net			4,339
Intangible assets:
Developed technology			28,520
In-Process Research & Development			7,330
Customer Relationships			1,560
Goodwill			50,952

Total assets acquired		$	97,808

Total purchase price (net of $2.2 million of contingent expense reimbursements)			97,808

The fair value of intangible assets of $37.4 million has been allocated to the following three asset categories: 1) developed technology, 2) in-process research & development and 3) customer relationships. Developed technology and customer relationships are amortized on a straight line basis over the estimated useful life of the assets.

The table below presents certain information on acquired identifiable intangible assets related to the ADI acquisition:


		Estimated Fair Value				Estimated Useful Life
		(in thousands)				(in years)
Developed technology		$	28,520			6
Customer relationships		$	1,560			7
The amounts of revenue and earnings of the Microphone Product Line since the acquisition date included in the 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.

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangible Assets	6 Months Ended
Goodwill and Purchased Intangible Assets	Sep. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Purchased Intangible Assets	'
	9. Goodwill and Purchased Intangible Assets
	Purchased 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 are 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 fiscal year 2015 at which time amortization will commence. During the three months ended September 28, 2014, the Company recorded $0.8 million of impairment on in-process research and development on one of the ADI acquisition projects.
	The following table summarizes the activity related to the carrying value of goodwill (in thousands):


	Balance as of March 30, 2014	$	50,952
	Goodwill recorded in connection with the acquisition of Movea S.A		68,330
	Goodwill recorded in connection with the acquisition of Trusted Positioning, Inc.		19,893

	Balance as of September 28, 2014	$	139,175

	Amortization for purchased intangible assets for the three months and six months ended September 28, 2014 was approximately $1.6 million and $2.9 million respectively. The following table represents intangible assets and accumulated amortization:


		Sep-14
		(in thousands)
		Gross		Accumulated		Net
		Gross		Amortization		Net
	Developed technology	$	44,320	$	4,741	$	39,579
	Customer relationships		1,560		204		1,356

	Total intangible assets subject to amortization	$	45,880	$	4,945	$	40,935


		Mar-14
		(in thousands)
		Gross		Accumulated		Net
		Gross		Amortization		Net
	Developed technology	$	28,520	$	1,980	$	26,540
	Customer relationships		1,560		93		1,467

	Total intangible assets subject to amortization	$	30,080	$	2,073	$	28,007


	The estimated future amortization expense related to intangible assets at September 28, 2014 is as follows:


	Fiscal Year	Estimated
		Amortization
		(in thousands)
	2015 (remaining 6 months)	$	4,068
	2016		8,136
	2017		8,136
	2018		8,136
	2019		8,136
	Thereafter		4,323

	Total	$	40,935

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Sep. 28, 2014
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 Micro-Electro-Mechanical Systems (“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 30, 2014 included in the Company’s Annual Report on Form 10-K filed on May 29, 2014 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 30, 2014.
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.
Basis of Consolidation	'
	Basis of Consolidation
	The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and include our accounts and the accounts of our wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in 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 operations.
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 fiscal year (“Fiscal 2014”) ended on March 30, 2014 (“March 2014”). The second fiscal quarter in each of the two most recent fiscal years ended on September 28, 2014 (“three months ended September 28, 2014” or “September 2014”) and September 29, 2013 (“three months ended September 29, 2013” or “September 2013”), respectively, and each quarter period included 13 weeks.
Use of Estimates	'
	Use of Estimates
	The preparation of the Company’s Condensed Consolidated Financial Statements and related Notes in conformity with accounting principles generally accepted in the United States of America (U.S. 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 Condensed Consolidated Financial Statements and related Notes and the reported amounts of income and expenses during the reporting period. Significant estimates included in the Consolidated Financial Statements and related Notes include income taxes, inventory valuation, stock-based compensation, loss contingencies, warranty reserves, valuation of acquired assets and contingent consideration, and valuation of convertible senior notes, including the related convertible notes hedges and warrants. 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 September 28, 2014, two customers accounted for 55% and 12% of accounts receivable. At March 30, 2014, three customers accounted for 28%, 19% and 19% of accounts receivable.
	For the three months ended September 28, 2014, two customers accounted for 29% and 26% of net revenue. For the six months ended September 28, 2014, three customers accounted for 30%, 17% and 10% of net revenue. For the three months ended September 29, 2013, two customers accounted for 36% and 14% of net revenue. For the six months ended September 29, 2013, one customer accounted for 31% of net revenue.
Warranty	'
	Warranty
	The Company’s warranty agreements are contract and component specific and can be for a period of up to three years after shipment for selected components. The accrual includes management’s judgment regarding anticipated rates of warranty claims and associated repair costs.
Net Income (Loss) Per Share	'
	Net Income (Loss) Per Share
	Basic net income (loss) per share is computed by dividing net income (loss) 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 (loss) 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.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU No. 2014-09 provides guidance that companies will recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the payment to which a company expects to be entitled in exchange for those goods or services. The Company will be required to implement the new revenue recognition standard for the first quarter of fiscal year 2018. The Company is currently evaluating the impact on its consolidated financial statements.
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.

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Sep. 28, 2014
Accounting Policies [Abstract]	'
Summary of Activity Related to Product Warranty Liability	'
	The following table summarizes the activity related to product warranty liability during the six months ended September 28, 2014 and September 29, 2013:


		Six Months Ended
		September 28,			September 29,
		2014			2013
		(in thousands)
	Beginning balance	$	80		$	123
	Provision for warranty		103			197
	Adjustments related to changes in estimate		(96	)		(203	)
	Less: actual warranty costs		(15	)		(16	)

	Ending balance	$	72		$	101

Calculation of Basic and Diluted Net Income (Loss) Per Share	'
	The following table presents the calculation of basic and diluted net income (loss) per share:


		Three Months Ended						Six Months Ended
		September 28,			September 29,			September 28,			September 29,
		2014			2013			2014			2013
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted
	Net income (loss)	$	(6,868	)	$	13,608		$	(11,700	)	$	23,930

	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income (loss) per share		88,997			86,289			88,650			85,658

	Diluted shares:
	Weighted-average shares used in computing basic net income (loss) per share		88,997			86,289			88,650			85,658
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		—			3,405			—			3,101
	Common stock warrants		—			84			—			82

	Weighted-average shares used in computing diluted net income (loss) per share		88,997			89,778			88,650			88,841

	Net income (loss) per share
	Basic	$	(0.08	)	$	0.16		$	(0.13	)	$	0.28
	Diluted	$	(0.08	)	$	0.15		$	(0.13	)	$	0.27
Securities Excluded from Computation of Diluted Net Income (Loss) Per Common 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						Six Months Ended
		September 28,			September 29,			September 28,			September 29,
		2014			2013			2014			2013
		(in thousands)
	Employee stock options		8,665			1,644			8,635			4,418
	Unvested restricted stock units		3,660			250			3,537			589

	Total antidilutive securities		12,325			1,894			12,172			5,007

Cash_Equivalents_and_Available1

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments (Tables)	6 Months Ended
	Sep. 28, 2014
Text Block [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'

	Assets and liabilities measured at fair value on a recurring basis were presented in the Company’s condensed consolidated balance sheet as of September 28, 2014.



			September 28, 2014				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)
	Assets
	Money Market Funds		$	3,151			$	3,151		$	—			$	—
	Corporate Notes and Bonds			117,448				—			117,448				—
	Municipal Notes and Bonds			1,644				—			1,644				—
	U.S. Agency Securities			2,500				—			2,500				—

	Total investments		$	124,743			$	3,151		$	121,592			$	—

	Liabilities
	Contingent consideration		$	16,034										$	16,034

	Assets
	Cash equivalents		$	3,151			$	3,151		$	—			$	—
	Short-term investments			86,629				—			86,629				—
	Long-term investments			34,963				—			34,963				—

	Total investments		$	124,743			$	3,151		$	121,592			$	—

	Liabilities
	Accrued liabilities		$	13,308										$	13,308
	Long-term liabilities			2,726											2,726

	Total contingent consideration		$	16,034			$	—		$	—			$	16,034




			September 28, 2014				Gross			Gross				September 28, 2014
			Amortized Cost				Unrealized			Unrealized				Estimated FMV
							Gain			Loss
	Corporate Notes and Bonds		$	117,449			$	38		$	(39	)		$	117,448
	Municipal Notes and Bonds			1,642				2			—				1,644
	U.S. Agency Securities			2,500				—			—				2,500

	Total Available-for-sale investments		$	121,591			$	40		$	(39	)		$	121,592

	Cash equivalents														3,151

	Total Aggregate Fair Value													$	124,743


	Level 1 and 2 financial assets:

	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, commercial paper, 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 six months ended September 28, 2014.



	March 30, 2014:

Assets measured at fair value on a recurring basis were presented in the Company’s consolidated balance sheet as of March 30, 2014.



		March 30,				Quoted Prices			Significant				Significant
		2014				in Active			Other				Other
		Balance				Markets for			Observable				Unobservable
						Identical			Inputs				Inputs
						Assets Level 1			Level 2				Level 3
		(in thousands)
Money Market Funds		$	10,657			$	10,657		$	—			$	—
Corporate Notes and Bonds			204,683				—			204,683				—
Municipal Notes and Bonds			3,895				—			3,895				—
Commercial Paper			8,988				—			8,988				—
U.S. Agency Securities			2,496				—			2,496				—

Total		$	230,719			$	10,657		$	220,062			$	—

Cash equivalents		$	10,657			$	10,657		$	—			$	—
Short-term investments			91,307				—			91,307				—
Long-term investments			128,755				—			128,755				—

Total		$	230,719			$	10,657		$	220,062			$




		March 30,				Gross			Gross				March 30,
		2014				Unrealized			Unrealized				2014
		Amortized Cost				Gain			Loss				Estimated FMV
		(in thousands)
Corporate Notes and Bonds		$	204,747			$	—		$	(64	)		$	204,683
Municipal Notes and Bonds			3,888				7			—				3,895
Commercial Paper			8,986				2			—				8,988
U.S. Agency Securities			2,500				—			(4	)			2,496

Total Available-for-sale investments		$	220,121			$	9		$	(68	)		$	220,062

Cash equivalents														10,657

Total Aggregate Fair Value													$	230,719

Summary of Changes in Fair Value of Company's Contingent Consideration Categorized as Level 3	'
	The following table provides a summary of changes in fair value of the Company’s contingent consideration categorized as Level 3 for the six months ended September 28, 2014:


			Six Months Ended
			September 28, 2014
			(in thousands)
	Beginning balance		$	—
	Add: Contingent consideration in connection with acquisitions			16,034

	Ending balance		$	16,034

Summary of Significant Unobservable Inputs used in Fair Value Measurement on Recurring Basis	'
	The following table presents certain information about the significant unobservable inputs used in the fair value measurement for the contingent consideration measured at fair value on a recurring basis using significant unobservable inputs:


	Description		Valuation Techniques		Significant Unobservable Inputs
	Liabilities: Contingent consideration		Present value of a Probability Weighted Earn-out model using an appropriate discount rate.		Estimate of meeting the milestones.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	6 Months Ended
Balance Sheet Details (Tables)	Sep. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Inventories	'
	Inventories at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Work in process	$	55,258		$	58,641
	Finished goods		19,753			14,391

	Total inventories	$	75,011		$	73,032

Prepaid Expenses and Other Current Assets	'
	Prepaid expenses and other current assets at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014
		(in thousands)
	Prepaid expenses	$	3,375		$	3,495
	Income tax receivable		8,712			5,932
	Other receivables		5,076			5,356
	Deferred tax assets		2,508			2,487
	Advance to vendors		414			1,026
	Other current assets		1,362			1,291

	Total prepaid expenses and other current assets	$	21,447		$	19,587

Property and Equipment	'
	Property and equipment at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Production and lab equipment	$	34,183		$	25,890
	Computer equipment and software		5,505			4,335
	Equipment under construction		12,055			2,298
	Leasehold improvements and furniture and fixtures		5,944			3,918

	Subtotal		57,687			36,441
	Accumulated depreciation and amortization		(15,290	)		(11,202	)

	Property and equipment — net	$	42,397		$	25,239

Accrued Liabilities	'
	Accrued liabilities at September 28, 2014 and March 30, 2014 consist of the following:


		September 28, 2014			March 30, 2014,
		(in thousands)
	Contingent consideration	$	13,349		$	—
	Payroll-related expenses		7,103			4,207
	Bonuses		3,194			3,019
	Legal fees		1,139			2,527
	Accrued contractual coupon interest payable on convertible senior notes		1,256			1,158
	Deferred revenue		954			800
	Income tax payable		177			117
	Other accrued liabilities		8,914			3,157

	Total accrued liabilities	$	36,086		$	14,985

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
Commitments and Contingencies (Tables)	Sep. 28, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments under Operating Leases	'
	Future minimum lease payments under operating leases as of September 28, 2014 are as follows:


		Amount
		(in thousands)
	Fiscal Years Ending:
	2015 (remainder)	$	2,340
	2016		5,878
	2017		5,970
	2018		5,877
	2019		5,991
	Beyond		6,133

	Total	$	32,189

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	6 Months Ended
Convertible Senior Notes (Tables)	Sep. 28, 2014
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:


		September 28, 2014
		(in thousands)
	Principal amount of the Notes	$	175,000
	Unamortized discount on the Notes		35,770

	Net carrying value	$	139,230

Schedule of Interest Expense Recognized Related to Notes	'
	The following table presents the amount of interest expense recognized related to the Notes for the three and six months ended September 28, 2014:


		Three Months Ended		Six Months Ended
		September 28, 2014		September 28, 2014
		(in thousands)
	Contractual coupon interest expense	$	764	$	1,532
	Accretion of debt discount		1,843		3,647
	Amortization of debt issuance costs		13		25

	Total interest expense related to the Notes	$	2,620	$	5,204

Schedule of Aggregate Future Principal Debt Maturities	'
	As of September 28, 2014, our aggregate future principal debt maturities are as follows (in thousands):


	Fiscal Year	September 28, 2014
		(in thousands)
	2015-2018	$	—
	2019		175,000

	Total	$	175,000

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	6 Months Ended
Stockholders' Equity (Tables)	Sep. 28, 2014
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)
	Outstanding — March 30, 2014		12,595			8,276		$	10.37			7.87		$	102,072
	Increase to stock option pool		3,533			—			—
	Options granted (weighted-average fair value of $7.33 per share)		(1,500	)		1,500			20.19
	Exercised options					(825	)		6.49
	Cancelled options		214			(214	)		12.47

	Outstanding — September 28, 2014		14,842			8,737		$	12.37			7.85		$	68,491

	Vested and expected to vest — September 28, 2014					7,404		$	11.74			7.67		$	62,434
	Vested — September 28, 2014					3,224		$	8.68			6.76		$	36,299
Weighted-Average Assumptions in Determining Stock-Based Compensation Expense Options Granted	'
	The Company used the following weighted-average assumptions in determining stock-based compensation expense for options granted in the three and six months ended September 28, 2014 and September 29, 2013.


		Three Months Ended						Six Months Ended
		September 28,			September 29,			September 28,			September 29,
		2014			2013			2014			2013
	Dividend rate		0	%		0	%		0	%		0	%
	Risk-free interest rate		1.5	%		1.5	%		1.4	%		1.2	%
	Expected life (in years)		4.6			4.7			4.5			4.7
	Expected volatility		41.4	%		41.9	%		41.7	%		41.7	%
Restricted Stock Unit and Restricted Stock Activity	'
	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows:


	Restricted stock units and restricted stock activities	Shares			Weighted Average
					Grant Date Fair
					Value Per Share
		(in thousands, except per share amount)
	Unvested at March 30, 2014		3,325		$	16.63
	Granted		1,048			21.84
	Released		(378	)		13.93
	Forfeited		(99	)		16.64

	Unvested at September 28, 2014		3,896		$	18.29

Common Stock Reserved for Future Issuance	'
	As of September 28, 2014 and March 30, 2014, common stock reserved for future issuance was as follows:


	Common stock reserved for issuance	September 2014			March 2014,
		(in thousands)
	Stock plans
	Outstanding stock options		8,737			8,276
	Outstanding restricted stock units and restricted stocks		3,896			3,325
	Reserved for future equity incentive grants		10,995			9,697

			23,628			21,298
	Purchase plan		339			400
	Warrants to purchase common stock		8,000			7,995

	Total common stock reserved for future issuances		31,967			29,693

Summary of Total Stock-Based Compensation Cost	'
	Total employee stock-based compensation costs for the Company’s stock plans for the three and six months ended September 28, 2014 and September 29, 2013 are as follows:


		Three Months Ended						Six Months Ended
		September 28,			September 29,			September 28,			September 29,
		2014			2013			2014			2013
		(in thousands)
	Cost of revenue	$	654		$	259		$	1,311		$	495
	Research and development		3,197			1,204			6,715			2,277
	Selling, general and administrative		3,151			1,897			6,611			3,405

	Total stock-based compensation expense	$	7,002		$	3,360		$	14,637		$	6,177

Business_Combination_Tables

Business Combination (Tables)	6 Months Ended
Business Combination (Tables)	Sep. 28, 2014
Summary of Unaudited Proforma of Combined Financial Information	'
	The following unaudited pro forma financial information presents the combined results of operations of InvenSense and Movea as if the acquisition had occurred as of the beginning of fiscal 2014:


		Three Months Ended					Six Months Ended
		September 28,			September 29,		September 28,			September 29,
		2014			2013		2014			2013
	Net revenue	$	90,368		$	71,603	$	157,550		$	128,274
	Net income (loss)	$	(7,305	)	$	11,307	$	(14,717	)	$	19,255
Movea S.A [Member]	'
Summary of Purchase Price of Assets Acquired and Liabilities Assumed	'
	The table below is a summary of the preliminary purchase price allocation of the fair value of assets acquired and liabilities assumed in connection with the acquisition of Movea (in thousands):


	Cash consideration	$	60,900
	Contingent consideration		8,400

		$	69,300

	Preliminary allocation of purchase price:
	Current assets	$	3,082
	Fixed assets		209
	Other non-current assets		592
	Developed technology		7,200
	Goodwill		68,330
	Current liabilities		(5,016	)
	Long-term liabilities		(5,097	)

	Total preliminary purchase price	$	69,300

Summary of Estimated Fair Value and Useful Lives of Intangible Assets	'
	The following table presents certain information on acquired identifiable intangible assets related to the Movea acquisition:


		Estimated Fair Value			Estimated Useful Life
		(in thousands)			(in years)
	Developed technology	$	7,200			5
Trusted Positioning, Inc. [Member]	'
Summary of Purchase Price of Assets Acquired and Liabilities Assumed	'
	The table below is a summary of the preliminary purchase price allocation for the 100% equity interest of the fair value of assets acquired and liabilities assumed in connection with the acquisition of TPI (in thousands):


	Cash consideration	$	11,499
	Issuance of common stock		5,703
	Contingent consideration		7,634
	Fair value of previously held 4.57% equity interest		1,215

		$	26,051

	Preliminary allocation of purchase price:
	Current assets	$	512
	Fixed assets		50
	Other non-current assets		546
	Developed technology		8,600
	Goodwill		19,893
	Current liabilities		(1,247	)
	Long-term liabilities		(2,303	)

	Total preliminary purchase price	$	26,051

Summary of Estimated Fair Value and Useful Lives of Intangible Assets	'
	The following table presents certain information on acquired identifiable intangible assets related to the TPI acquisition:


		Estimated Fair Value			Estimated Useful Life
		(in thousands)			(in years)
	Developed technology	$	8,600		5
Analog Devices, Inc. [Member]	'
Summary of Purchase Price of Assets Acquired and Liabilities Assumed	'
	The allocation of the purchase price of the assets acquired and liabilities assumed based on their fair values was as follows:


		Total Amount
		(in thousands)
	Inventories	$	5,107
	Property and equipment, net		4,339
	Intangible assets:
	Developed technology		28,520
	In-Process Research & Development		7,330
	Customer Relationships		1,560
	Goodwill		50,952

	Total assets acquired	$	97,808

	Total purchase price (net of $2.2 million of contingent expense reimbursements)		97,808

Summary of Estimated Fair Value and Useful Lives of Intangible Assets	'
	The table below presents certain information on acquired identifiable intangible assets related to the ADI acquisition:


		Estimated Fair Value			Estimated Useful Life
		(in thousands)			(in years)
	Developed technology	$	28,520		6
	Customer relationships	$	1,560		7

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangible Assets (Tables)	6 Months Ended
Goodwill and Purchased Intangible Assets (Tables)	Sep. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Summary of Activity Related to Carrying Value of Goodwill	'
	The following table summarizes the activity related to the carrying value of goodwill (in thousands):


	Balance as of March 30, 2014	$	50,952
	Goodwill recorded in connection with the acquisition of Movea S.A		68,330
	Goodwill recorded in connection with the acquisition of Trusted Positioning, Inc.		19,893

	Balance as of September 28, 2014	$	139,175

Summary of Intangible Assets and Accumulated Amortization	'
	The following table represents intangible assets and accumulated amortization:


		Sep-14
		(in thousands)
		Gross		Accumulated		Net
		Gross		Amortization		Net
	Developed technology	$	44,320	$	4,741	$	39,579
	Customer relationships		1,560		204		1,356

	Total intangible assets subject to amortization	$	45,880	$	4,945	$	40,935


		Mar-14
		(in thousands)
		Gross		Accumulated		Net
		Gross		Amortization		Net
	Developed technology	$	28,520	$	1,980	$	26,540
	Customer relationships		1,560		93		1,467

	Total intangible assets subject to amortization	$	30,080	$	2,073	$	28,007

Estimated Future Amortization Expense Related to Intangible Assets	'
	The estimated future amortization expense related to intangible assets at September 28, 2014 is as follows:


	Fiscal Year	Estimated
		Amortization
		(in thousands)
	2015 (remaining 6 months)	$	4,068
	2016		8,136
	2017		8,136
	2018		8,136
	2019		8,136
	Thereafter		4,323

	Total	$	40,935

Organization_and_Summary_of_Si3

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Sep. 28, 2014

Mar. 30, 2014

Sep. 28, 2014

Mar. 30, 2014

Sep. 28, 2014

Mar. 30, 2014

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Accounts Receivable [Member]

Net Revenue [Member]

Maximum [Member]

Customer

Customer One [Member]

Customer Two [Member]

Customer Three [Member]

Customer

Customer One [Member]

Customer Two [Member]

Customer Three [Member]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Incorporation month and year

'2003-06

Number of major customers

Percentage of accounts receivable

55.00%

28.00%

12.00%

19.00%

Percentage of net revenue

29.00%

36.00%

30.00%

31.00%

26.00%

14.00%

17.00%

10.00%

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 $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]	'	'
Beginning balance	$80	$123
Provision for warranty	103	197
Adjustments related to changes in estimate	-96	-203
Less: actual warranty costs	-15	-16
Ending balance	$72	$101

Organization_and_Summary_of_Si5

Organization and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Basic and Diluted	'	'	'	'
Net income (loss)	($6,868)	$13,608	($11,700)	$23,930
Basic shares:	'	'	'	'
Weighted-average shares used in computing basic net income (loss) per share	88,997	86,289	88,650	85,658
Diluted shares:	'	'	'	'
Weighted-average shares used in computing basic net income (loss) per share	88,997	86,289	88,650	85,658
Effect of potentially dilutive securities:	'	'	'	'
Stock options and unvested restricted stock	'	3,405	'	3,101
Common stock warrants	'	84	'	82
Weighted-average shares used in computing diluted net income (loss) per share	88,997	89,778	88,650	88,841
Net income (loss) per share	'	'	'	'
Basic	($0.08)	$0.16	($0.13)	$0.28
Diluted	($0.08)	$0.15	($0.13)	$0.27

Organization_and_Summary_of_Si6

Organization and Summary of Significant Accounting Policies - Securities Excluded from Computation of Diluted Net Income (Loss) Per Common Share (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	12,325	1,894	12,172	5,007
Employee Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	8,665	1,644	8,635	4,418
Unvested Restricted Stock Units [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total antidilutive securities	3,660	250	3,537	589

Cash_Equivalents_and_Available2

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014	Sep. 29, 2013	Mar. 31, 2013	Mar. 30, 2014	Sep. 28, 2014	Mar. 30, 2014	Sep. 28, 2014	Mar. 30, 2014	Sep. 28, 2014	Mar. 30, 2014
	Sep. 28, 2014	Mar. 30, 2014	Sep. 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	$38,400,000	$26,000,000	'	'	'	'	'	'	'	'	'
Cash equivalents	35,300,000	'	'	'	15,300,000	'	'	'	'	'	'
Cash and cash equivalents	38,424,000	26,025,000	118,183,000	100,843,000	'	'	'	'	'	34,700,000	9,800,000
Short-term investments available-for-sale	86,600,000	91,300,000	'	'	'	'	'	'	'	'	'
Long-term investments available-for-sale	35,000,000	128,800,000	'	'	'	'	'	'	'	'	'
Investments available-for-sale total	121,600,000	220,100,000	'	'	'	'	'	'	'	'	'
Investment maturity period	'	'	'	'	'	'1 Year	'1 Year	'2 Years	'2 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, and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Liabilities	'	'
Estimated FMV	$86,629	$91,307
Fair Value, Recurring [Member]	'	'
Assets	'	'
Fair value of assets	124,743	230,719
Fair value of assets	124,743	230,719
Fair value of assets	124,743	230,719
Liabilities	'	'
Accrued liabilities	16,034	'
Assets	'	'
Fair value of assets	124,743	230,719
Fair value of assets	124,743	230,719
Liabilities	'	'
Accrued liabilities	16,034	'
Fair value of assets	124,743	230,719
Amortized Cost	121,591	220,121
Gross Unrealized Gain	40	9
Gross Unrealized Loss	-39	-68
Estimated FMV	121,592	220,062
Fair Value, Recurring [Member] \| Accrued Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	13,308	'
Liabilities	'	'
Accrued liabilities	13,308	'
Fair Value, Recurring [Member] \| Long-term Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	2,726	'
Liabilities	'	'
Accrued liabilities	2,726	'
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Fair value of assets	3,151	10,657
Liabilities	'	'
Accrued liabilities	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member] \| Accrued Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	'	'
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member] \| Long-term Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	'	'
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	121,592	220,062
Fair value of assets	121,592	220,062
Liabilities	'	'
Accrued liabilities	'	'
Assets	'	'
Fair value of assets	121,592	220,062
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member] \| Accrued Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	'	'
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member] \| Long-term Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	'	'
Liabilities	'	'
Accrued liabilities	'	'
Fair Value, Recurring [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Accrued liabilities	16,034	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Accrued liabilities	16,034	'
Fair Value, Recurring [Member] \| Significant Other Unobservable Inputs Level 3 [Member] \| Accrued Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	13,308	'
Liabilities	'	'
Accrued liabilities	13,308	'
Fair Value, Recurring [Member] \| Significant Other Unobservable Inputs Level 3 [Member] \| Long-term Liabilities [Member]	'	'
Liabilities	'	'
Accrued liabilities	2,726	'
Liabilities	'	'
Accrued liabilities	2,726	'
Fair Value, Recurring [Member] \| Money Market Funds [Member]	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Fair value of assets	3,151	10,657
Assets	'	'
Fair value of assets	3,151	10,657
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Fair value of assets	3,151	10,657
Assets	'	'
Fair value of assets	3,151	10,657
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Corporate Notes and Bonds [Member]	'	'
Assets	'	'
Fair value of assets	117,448	204,683
Assets	'	'
Fair value of assets	117,448	204,683
Liabilities	'	'
Fair value of assets	117,448	204,683
Amortized Cost	117,449	204,747
Gross Unrealized Gain	38	'
Gross Unrealized Loss	-39	-64
Estimated FMV	117,448	204,683
Fair Value, Recurring [Member] \| Corporate Notes and Bonds [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Corporate Notes and Bonds [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	117,448	204,683
Assets	'	'
Fair value of assets	117,448	204,683
Liabilities	'	'
Fair value of assets	117,448	204,683
Fair Value, Recurring [Member] \| Corporate Notes and Bonds [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Municipal Notes and Bonds [Member]	'	'
Assets	'	'
Fair value of assets	1,644	3,895
Assets	'	'
Fair value of assets	1,644	3,895
Liabilities	'	'
Fair value of assets	1,644	3,895
Amortized Cost	1,642	3,888
Gross Unrealized Gain	2	7
Gross Unrealized Loss	'	'
Estimated FMV	1,644	3,895
Fair Value, Recurring [Member] \| Municipal Notes and Bonds [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Municipal Notes and Bonds [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	1,644	3,895
Assets	'	'
Fair value of assets	1,644	3,895
Liabilities	'	'
Fair value of assets	1,644	3,895
Fair Value, Recurring [Member] \| Municipal Notes and Bonds [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| U.S. Agency Securities [Member]	'	'
Assets	'	'
Fair value of assets	2,500	2,496
Assets	'	'
Fair value of assets	2,500	2,496
Liabilities	'	'
Fair value of assets	2,500	2,496
Amortized Cost	2,500	2,500
Gross Unrealized Gain	'	'
Gross Unrealized Loss	'	-4
Estimated FMV	2,500	2,496
Fair Value, Recurring [Member] \| U.S. Agency Securities [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| U.S. Agency Securities [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	2,500	2,496
Assets	'	'
Fair value of assets	2,500	2,496
Liabilities	'	'
Fair value of assets	2,500	2,496
Fair Value, Recurring [Member] \| U.S. Agency Securities [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Cash Equivalents [Member]	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Assets	'	'
Fair value of assets	3,151	10,657
Liabilities	'	'
Fair value of assets	3,151	10,657
Fair Value, Recurring [Member] \| Cash Equivalents [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	3,151	10,657
Assets	'	'
Fair value of assets	3,151	10,657
Liabilities	'	'
Fair value of assets	3,151	10,657
Fair Value, Recurring [Member] \| Cash Equivalents [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Cash Equivalents [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Liabilities	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Short-term Investments [Member]	'	'
Assets	'	'
Fair value of assets	86,629	91,307
Fair value of assets	86,629	91,307
Assets	'	'
Fair value of assets	86,629	91,307
Fair Value, Recurring [Member] \| Short-term Investments [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Short-term Investments [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	86,629	91,307
Fair value of assets	86,629	91,307
Assets	'	'
Fair value of assets	86,629	91,307
Fair Value, Recurring [Member] \| Short-term Investments [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Long-term Investments [Member]	'	'
Assets	'	'
Fair value of assets	34,963	128,755
Fair value of assets	34,963	128,755
Assets	'	'
Fair value of assets	34,963	128,755
Fair Value, Recurring [Member] \| Long-term Investments [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Long-term Investments [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	34,963	128,755
Fair value of assets	34,963	128,755
Assets	'	'
Fair value of assets	34,963	128,755
Fair Value, Recurring [Member] \| Long-term Investments [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Commercial Paper [Member]	'	'
Assets	'	'
Fair value of assets	'	8,988
Fair value of assets	'	8,988
Assets	'	'
Fair value of assets	'	8,988
Liabilities	'	'
Amortized Cost	'	8,986
Gross Unrealized Gain	'	2
Gross Unrealized Loss	'	'
Estimated FMV	'	8,988
Fair Value, Recurring [Member] \| Commercial Paper [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'
Fair Value, Recurring [Member] \| Commercial Paper [Member] \| Significant Other Observable Inputs Level 2 [Member]	'	'
Assets	'	'
Fair value of assets	'	8,988
Fair value of assets	'	8,988
Assets	'	'
Fair value of assets	'	8,988
Fair Value, Recurring [Member] \| Commercial Paper [Member] \| Significant Other Unobservable Inputs Level 3 [Member]	'	'
Assets	'	'
Fair value of assets	'	'
Fair value of assets	'	'
Assets	'	'
Fair value of assets	'	'

Cash_Equivalents_and_Available4

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Contingent Consideration Categorized as Level 3 (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014
Fair Value Disclosures [Abstract]	'
Beginning balance	'
Add: Contingent consideration in connection with acquisitions	16,034
Ending balance	$16,034

Cash_Equivalents_and_Available5

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments - Summary of Significant Unobservable Inputs used in Fair Value Measurement on Recurring Basis (Detail)	6 Months Ended
	Sep. 28, 2014
Debt Instrument Fair Value Carrying Value [Abstract]	'
Valuation techniques, Description	'Present value of a Probability Weighted Earn-out model using an appropriate discount rate
Significant unobservable inputs, Description	'Estimate of meeting the milestones.

Balance_Sheet_Details_Inventor

Balance Sheet Details - Inventories (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Inventory Disclosure [Abstract]	'	'
Work in process	$55,258	$58,641
Finished goods	19,753	14,391
Total inventories	$75,011	$73,032

Balance_Sheet_Details_Prepaid_

Balance Sheet Details - Prepaid Expenses and Other Current Assets (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Balance Sheet Related Disclosures [Abstract]	'	'
Prepaid expenses	$3,375	$3,495
Income tax receivable	8,712	5,932
Other receivables	5,076	5,356
Deferred tax assets	2,508	2,487
Advance to vendors	414	1,026
Other current assets	1,362	1,291
Total prepaid expenses and other current assets	$21,447	$19,587

Balance_Sheet_Details_Property

Balance Sheet Details - Property and Equipment (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Property, Plant and Equipment [Line Items]	'	'
Subtotal	$57,687	$36,441
Accumulated depreciation and amortization	-15,290	-11,202
Property and equipment - net	42,397	25,239
Production and Lab Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	34,183	25,890
Computer Equipment and Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	5,505	4,335
Equipment Under Construction [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	12,055	2,298
Leasehold Improvements and Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Subtotal	$5,944	$3,918

Balance_Sheet_Details_Addition

Balance Sheet Details - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Balance Sheet Related Disclosures [Abstract]	'	'	'	'
Depreciation expense	$2,600	$800	$4,310	$1,524

Balance_Sheet_Details_Accrued_

Balance Sheet Details - Accrued Liabilities (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Accrued Liabilities [Line Items]	'	'
Contingent consideration	$13,349	'
Payroll-related expenses	7,103	4,207
Bonuses	3,194	3,019
Legal fees	1,139	2,527
Deferred revenue	954	800
Income tax payable	177	117
Other accrued liabilities	8,914	3,157
Total accrued liabilities	36,086	14,985
Convertible Senior Notes [Member]	'	'
Accrued Liabilities [Line Items]	'	'
Accrued contractual coupon interest payable on convertible senior notes	$1,256	$1,158

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'	'	'
Non-cancelable operating leases terms	'	'	'The Company has non-cancelable operating leases for its facilities through fiscal year 2020.	'
Operating leases, expiration date	'	'	'2020	'
Rental expense	$1.20	$1.20	$2.30	$1.80

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)	Sep. 28, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014
Leases [Abstract]	'
2015 (remainder)	$2,340
2016	5,878
2017	5,970
2018	5,877
2019	5,991
Beyond	6,133
Total	$32,189

Convertible_Senior_Notes_Addit

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

6 Months Ended

0 Months Ended

6 Months Ended

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

Sep. 28, 2014

Nov. 07, 2013

Sep. 28, 2014

Nov. 30, 2013

Sep. 28, 2014

Convertible Notes Hedges Purchased [Member]

Warrant Sold [Member]

Convertible Senior Notes Due 2018 [Member]

Significant Other Observable Inputs Level 2 [Member]

Equity Component [Member]

Debt Discount [Member]

Other Non-current Assets [Member]

Coupon Rate Plus [Member]

Non-Cash Accretion Expense [Member]

Condition One [Member]

Second Condition [Member]

Hedge_Strategies

Days

Debt Instrument [Line Items]

Convertible senior notes, issuance date

'2013-11

Convertible senior notes, principal amount

$175,000,000

Convertible senior notes, maturity date

1-Nov-18

Convertible senior notes, Stated interest rate

1.75%

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

169,300,000

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

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

Convertible senior notes, conversion ratio

45.683

Convertible senior notes, conversion price

$21.89

Net proceeds from the offering of the Notes

169,300,000

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 1 month 6 days

Convertible senior notes, effective interest rate description

'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 senior notes, effective interest rate

7.84%

1.75%

6.09%

Call options

Common stock at exercise price

$21.89

$28.66

Conversion of shares in convertible note

0.045683

Aggregate price for convertible note hedge

39,100,000

Proceeds from call options

25,600,000

Fair value of convertible notes

$195,400,000

Convertible_Senior_Notes_Summa

Convertible Senior Notes - Summary of Principal Amounts and Related Unamortized Discount on Notes (Detail) (USD $)	Sep. 28, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014
Debt Disclosure [Abstract]	'
Principal amount of the Notes	$175,000
Unamortized discount on the Notes	35,770
Net carrying value	$139,230

Convertible_Senior_Notes_Sched

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to Notes (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 28, 2014
Debt Disclosure [Abstract]	'	'
Contractual coupon interest expense	$764	$1,532
Accretion of debt discount	1,843	3,647
Amortization of debt issuance costs	13	25
Total interest expense related to the Notes	$2,620	$5,204

Convertible_Senior_Notes_Sched1

Convertible Senior Notes - Schedule of Aggregate Future Principal Debt Maturities (Detail) (USD $)	Sep. 28, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014
Debt Disclosure [Abstract]	'
2015-2018	'
2019	175,000
Total	$175,000

Stockholders_Equity_Additional

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

3 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Sep. 29, 2013

Mar. 30, 2014

Sep. 28, 2014

Mar. 30, 2014

Jul. 31, 2011

Sep. 28, 2014

Sep. 29, 2013

Sep. 28, 2014

Minimum [Member]

2013 Employee Stock Purchase Plan [Member]

2011 Stock Incentive Plan [Member]

Restricted Stock Units and Restricted Stock [Member]

Employee Stock Options [Member]

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

Common stock outstanding percentage

4.00%

Increase and decrease of common stock

3,500,000

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%

Incentive 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

Aggregate intrinsic value of the stock options exercised

$11.20

$11.30

$14.10

$22.80

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

18.3

20.7

18.3

20.7

Unrecognized expense of stock option, period for recognition

'2 years 7 months 6 days

'3 years 1 month 6 days

'3 years 2 months 12 days

Total unrecognized compensation cost

$43.60

Weighted-average grant-date fair value per share

$21.84

$14.69

Maximum employee subscription percentage

10.00%

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.

Purchase price of stock under the Purchase Plan

85.00%

Shares purchased

61,000

Shares reserved for issuance under the Purchase Plan

31,967,000

29,693,000

339,000

400,000

Stockholders_Equity_Stock_Opti

Stockholders' Equity - Stock Option Activities (Detail) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2014	Jan. 01, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Options Available for Grant, Beginning Balance	12,595	'
Options Available for Grant, Increase to stock option pool	3,533	'
Options Available for Grant, Options granted	-1,500	'
Options Available for Grant, Options exercised	'	'
Options Available for Grant, Options canceled	214	'
Options Available for Grant, Ending Balance	14,842	'
Options Issued and Outstanding, Beginning Balance	8,276	'
Options Issued and Outstanding, Options granted	1,500	'
Options Issued and Outstanding, Options exercised	-825	'
Options Issued and Outstanding, Options canceled	-214	'
Options Issued and Outstanding, Ending Balance	8,737	'
Options Issued and Outstanding, Vested and expected to vest	7,404	'
Options Issued and Outstanding, Vested	$3,224	'
Weighted-Average Exercise Price, Beginning Balance	$10.37	'
Weighted-Average Exercise Price, Options granted	$20.19	'
Weighted-Average Exercise Price, Options exercised	$6.49	'
Weighted-Average Exercise Price, Options canceled	$12.47	'
Weighted-Average Exercise Price, Ending Balance	$12.37	'
Weighted-Average Exercise Price, Vested and expected to vest	$11.74	'
Weighted-Average Exercise Price, Vested	$8.68	'
Weighted- Average Remaining Contractual Term (In Years), Balance	'7 years 10 months 6 days	'7 years 10 months 13 days
Weighted-Average Remaining Contractual Term (In Years), Vested and expected to vest	'7 years 8 months 1 day	'
Weighted-Average Remaining Contractual Term (In Years), Vested	'6 years 9 months 4 days	'
Aggregate Intrinsic Value, Beginning Balance	102,072	'
Aggregate Intrinsic Value, Ending Balance	68,491	'
Aggregate Intrinsic Value, Vested and expected to vest	62,434	'
Aggregate Intrinsic Value, Vested	$36,299	'

Stockholders_Equity_Stock_Opti1

Stockholders' Equity - Stock Option Activities (Parenthetical) (Detail) (USD $)	6 Months Ended
	Sep. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Weighted-average fair value per share	$7.33

Stockholders_Equity_WeightedAv

Stockholders' Equity - Weighted-Average Assumptions in Determining Stock-Based Compensation Expense Options Granted (Detail) (Employee Stock Options [Member])	3 Months Ended		6 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Employee Stock Options [Member]	'	'	'	'
Dividend rate	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.50%	1.50%	1.40%	1.20%
Expected life (in years)	'4 years 7 months 6 days	'4 years 8 months 12 days	'4 years 6 months	'4 years 8 months 12 days
Expected volatility	41.40%	41.90%	41.70%	41.70%

Stockholders_Equity_Restricted

Stockholders' Equity - Restricted Stock Unit and Restricted Stock Activity (Detail) (Restricted Stock Units and Restricted Stock [Member], USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013
Restricted Stock Units and Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares Unvested, Beginning period	3,325	'
Shares, Granted	1,048	'
Shares, Released	-378	'
Shares, Forfeited	-99	'
Shares Unvested, Ending period	3,896	'
Weighted average grant date fair value per share, Unvested Beginning period	$16.63	'
Weighted average grant date fair value per share, Granted	$21.84	$14.69
Weighted average grant date fair value per share, Released	$13.93	'
Weighted average grant date fair value per share, Forfeited	$16.64	'
Weighted average grant date fair value per share, Unvested Ending period	$18.29	'

Stockholders_Equity_Common_Sto

Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	23,628	21,298
Warrants to purchase common stock	8,000	7,995
Total common stock reserved for future issuances	31,967	29,693
2013 Employee Stock Purchase Plan [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Total common stock reserved for future issuances	339	400
Employee Stock Options [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	8,737	8,276
Restricted Stock Units and Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	3,896	3,325
Reserved for Future Equity Incentive Grants [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for future issuance	10,995	9,697

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Total Stock-Based Compensation Costs (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Total stock-based compensation expense	$7,002	$3,360	$14,637	$6,177
Cost of Revenue [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Total stock-based compensation expense	654	259	1,311	495
Research and Development [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Total stock-based compensation expense	3,197	1,204	6,715	2,277
Selling, General and Administrative [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Total stock-based compensation expense	$3,151	$1,897	$6,611	$3,405

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended			6 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2013	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'	'	'
Income tax provision	$603,000	$1,945,000	$1,945,000	$882,000	$3,753,000	$3,753,000
Uncertain tax positions within Other long-term liabilities	$10,500,000	'	'	$10,500,000	'	'

Business_Combination_Additiona

Business Combination - Additional Information (Detail) (USD $)

Sep. 28, 2014

Jul. 22, 2014

Sep. 28, 2014

Jul. 22, 2014

Sep. 28, 2014

Jul. 22, 2014

Aug. 29, 2014

Sep. 28, 2014

Aug. 29, 2014

Sep. 28, 2014

Aug. 29, 2014

Sep. 28, 2014

Dec. 28, 2014

Sep. 28, 2014

Movea S.A [Member]

Trusted Positioning, Inc. [Member]

Analog Devices, Inc. [Member]

Design win [Member]

Product Development [Member]

2011 Stock Incentive Plan [Member]

Developed Technology [Member]

Accrued Liabilities [Member]

Other long-term liabilities [Member]

Design win [Member]

Development [Member]

Development of cloud [Member]

Deployment of cloud [Member]

2011 Stock Incentive Plan [Member]

Developed Technology [Member]

Forecast [Member]

Developed Technology [Member]

Unvested Restricted Stock Units [Member]

Business Acquisition [Line Items]

Business acquisition, effective date

22-Jul-14

29-Aug-14

Percentage of equity interest acquired

100.00%

Cash consideration

$60,900,000

$11,499,000

Business acquisition, additional contingent cash payment

13,349,000

13,000,000

8,000,000

5,000,000

3,000,000

2,000,000

Fair value of RSUs granted

6,600,000

5,000,000

RSUs vesting period

'5 years

Business acquisition, contingent cash payment

8,400,000

7,634,000

4,900,000

2,700,000

70,000,000

Estimated useful life

'5 years

'6 years

Fair value of investments

1,215,000

300,000

Percentage of common stock acquired

4.57%

Purchase consideration remaining outstanding common stock

26,051,000

Number of common shares issued

236,000

Issuance of common stock

5,703,000

Equity interest percentage

100.00%

Non-cash gain on investment in acquiree

900,000

Business acquisition, purchase price

69,300,000

100,000,000

Business acquisition, contingent future expense reimbursements

2,200,000

Business acquisition, fair value of contingent consideration

Fair value of intangible assets

$7,200,000

$8,600,000

$37,400,000

$28,520,000

Business_Combination_Summary_o

Business Combination - Summary of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $)

Sep. 28, 2014

Mar. 30, 2014

Aug. 29, 2014

Sep. 28, 2014

Aug. 29, 2014

Sep. 28, 2014

Aug. 29, 2014

Sep. 28, 2014

Jul. 22, 2014

Sep. 28, 2014

Jul. 22, 2014

In Thousands, unless otherwise specified

Trusted Positioning, Inc. [Member]

Analog Devices, Inc. [Member]

Movea S.A [Member]

Developed Technology [Member]

In-Process Research And Development [Member]

Customer Relationships [Member]

Developed Technology [Member]

Business Acquisition [Line Items]

Cash consideration

$11,499

$60,900

Inventories

5,107

Issuance of common stock

5,703

Property and equipment, net

4,339

209

Contingent consideration

7,634

8,400

Fair value of previously held 4.57% equity interest

1,215

300

Purchase consideration

69,300

Purchase Consideration including equity interest previously held

26,051

Preliminary allocation of purchase price:

Current assets

512

3,082

Fixed assets

4,339

209

Other non-current assets

546

592

Intangible assets

8,600

37,400

28,520

7,330

1,560

7,200

Goodwill

139,175

50,952

19,893

50,952

68,330

Current liabilities

-1,247

-5,016

Long-term liabilities

-2,303

-5,097

Total purchase price

26,051

97,808

69,300

Intangible assets

8,600

37,400

28,520

7,330

1,560

7,200

Goodwill

139,175

50,952

19,893

50,952

68,330

Total assets acquired

97,808

Total purchase price

$26,051

$97,808

$69,300

Business_Combination_Summary_o1

Business Combination - Summary of Estimated Fair Value and Useful Lives of Intangible Assets (Detail) (USD $)	6 Months Ended		6 Months Ended			6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Jul. 22, 2014	Sep. 28, 2014	Aug. 29, 2014	Sep. 28, 2014	Sep. 28, 2014	Sep. 28, 2014
	Movea S.A [Member]	Movea S.A [Member]	Trusted Positioning, Inc. [Member]	Trusted Positioning, Inc. [Member]	Analog Devices, Inc. [Member]	Analog Devices, Inc. [Member]	Analog Devices, Inc. [Member]
	Developed Technology [Member]	Developed Technology [Member]	Developed Technology [Member]	Developed Technology [Member]		Developed Technology [Member]	Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'	'
Estimated Fair Value	$7,200	$7,200	$8,600	$8,600	$37,400	$28,520	$1,560
Estimated useful life	'5 years	'	'5 years	'	'	'6 years	'7 years

Business_Combination_Summary_o2

Business Combination - Summary of Unaudited Proforma of Combined Financial Information (Detail) (Movea S.A [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Movea S.A [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Net revenue	$90,368	$71,603	$157,550	$128,274
Net income (loss)	($7,305)	$11,307	($14,717)	$19,255

Business_Combination_Summary_o3

Business Combination - Summary of Purchase Price of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $)	Aug. 29, 2014	Sep. 28, 2014
In Millions, unless otherwise specified	Trusted Positioning, Inc. [Member]	Analog Devices, Inc. [Member]
Business Acquisition [Line Items]	'	'
Percentage of common stock acquired	4.57%	'
Contingent expense reimbursements	'	$2.20

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 28, 2014
Finite-Lived Intangible Assets [Line Items]	'	'
In-process research and development, Impairment	'	$770
Amortization for acquired intangible assets	1,600	2,895
In-Process Research And Development [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
In-process research and development, Impairment	$800	'

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangible Assets - Summary of Activity Related to Carrying Value of Goodwill (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014	Sep. 28, 2014	Jul. 22, 2014	Sep. 28, 2014	Aug. 29, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014	Movea S.A [Member]	Movea S.A [Member]	Trusted Positioning, Inc. [Member]	Trusted Positioning, Inc. [Member]
Goodwill [Line Items]	'	'	'	'	'	'
Beginning balance	$139,175	$50,952	'	$68,330	'	$19,893
Goodwill recorded in connection with the acquisition	'	'	68,330	'	19,893	'
Ending balance	$139,175	$50,952	'	$68,330	'	$19,893

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangible Assets - Summary of Intangible Assets and Accumulated Amortization (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	$45,880	$30,080
Intangible assets, Accumulated Amortization	4,945	2,073
Intangible assets, Net	40,935	28,007
Developed Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	44,320	28,520
Intangible assets, Accumulated Amortization	4,741	1,980
Intangible assets, Net	39,579	26,540
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	1,560	1,560
Intangible assets, Accumulated Amortization	204	93
Intangible assets, Net	$1,356	$1,467

Goodwill_and_Purchased_Intangi5

Goodwill and Purchased Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)	Sep. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
2015 (remaining 6 months)	$4,068	'
2016	8,136	'
2017	8,136	'
2018	8,136	'
2019	8,136	'
Thereafter	4,323	'
Intangible assets, Net	$40,935	$28,007