InvenSense 10-Q 30 Jan 15 2015 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Dec. 28, 2014	Jan. 23, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	28-Dec-14
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	INVN
Entity Registrant Name	InvenSense Inc
Entity Central Index Key	1294924
Current Fiscal Year End Date	-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		90,309,000

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$65,057	$26,025
Short-term investments	103,863	91,307
Accounts receivable	73,935	39,009
Inventories	67,801	73,032
Prepaid expenses and other current assets	20,061	19,587
Total current assets	330,717	248,960
Property and equipment, net	42,537	25,239
Intangible assets, net	45,461	35,360
Goodwill	139,175	50,952
Long-term investments	3,501	128,755
Other assets	11,558	5,469
Total assets	572,949	494,735
Current liabilities:
Accounts payable	20,472	18,964
Accrued liabilities	33,457	14,985
Total current liabilities	53,929	33,949
Long-term debt	141,104	135,583
Other long-term liabilities	29,050	11,375
Total liabilities	224,083	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 December 28, 2014 and March 30, 2014
Common stock:
Common stock, $0.001 par value - 750,000 shares authorized, 90,180 shares issued and outstanding at December 28, 2014, 88,332 shares issued and outstanding at March 30, 2014	252,460	215,958
Accumulated other comprehensive income (loss)	-23	-38
Retained earnings	96,429	97,908
Total stockholders' equity	348,866	313,828
Total liabilities and stockholders' equity	$572,949	$494,735

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, except Per Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	20,000	20,000
Preferred stock, shares issued	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	90,180	88,332
Common stock, shares outstanding	90,180	88,332

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Net revenue	$115,864	$66,684	$272,740	$193,534
Costs of revenue	65,468	35,094	159,827	96,050
Gross profit	50,396	31,590	112,913	97,484
Operating expenses:
Research and development	24,391	14,522	65,392	32,446
Selling, general and administrative	15,551	15,663	44,061	36,243
Litigation settlement		14,500		14,500
Total operating expenses	39,942	44,685	109,453	83,189
Income (loss) from operations	10,454	-13,095	3,460	14,295
Interest (expense)	-2,690	-1,463	-7,894	-1,463
Other income (expense), net	-281	-220	1,099	73
Income (loss) before income taxes	7,483	-14,778	-3,335	12,905
Income tax provision (benefit)	-2,738	-2,599	-1,856	1,154
Net income (loss)	$10,221	($12,179)	($1,479)	$11,751
Net income (loss) per share of common stock:
Basic	$0.11	($0.14)	($0.02)	$0.14
Diluted	$0.11	($0.14)	($0.02)	$0.13
Weighted average shares outstanding used in computing net income (loss) per share:
Basic	89,779	87,047	89,026	86,145
Diluted	92,336	87,047	89,026	89,364

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$10,221	($12,179)	($1,479)	$11,751
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities, net of tax	-24	-94	15	-185
Comprehensive income (loss)	$10,197	($12,273)	($1,464)	$11,566

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Cash flows from operating activities:
Net income (loss)	($1,479)	$11,751
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	7,356	2,933
Amortization of intangible assets	4,929	829
Write-off of in-process research and development	770
Loss on disposal of property and equipment	457
Gain on equity investment	-890
Stock-based compensation expense	22,937	10,896
Deferred income tax assets	-5,212	1
Tax effect of employee benefit plan	42	3,231
Excess tax benefit from stock-based compensation	-42	-3,231
Non cash interest expense	5,579	1,069
Changes in operating assets and liabilities:
Accounts receivable	-34,308	-4,681
Inventories	5,232	-29,643
Prepaid expenses and other assets	1,000	-2,547
Other assets	-160	-1,400
Accounts payable	628	-2,341
Accrued liabilities	8,224	24,926
Net cash provided by operating activities	15,063	11,793
Cash flows from investing activities:
Acquisitions, net of cash acquired	-71,326	-99,324
Purchase of property and equipment	-25,289	-14,682
Sales and maturities of available-for-sale investments	112,728	63,145
Purchase of available-for-sale investments		-189,106
Net cash provided by (used in) investing activities	16,113	-239,967
Cash flows from financing activities:
Proceeds from debt issuance, net of issuance costs		169,750
Proceeds from sale of warrants		25,643
Proceeds from the issuance of common stock	7,818	8,960
Payment for purchase of convertible notes hedge		-39,118
Payments of long-term debt and capital lease obligations	-4	-8
Excess tax benefit from stock-based compensation	42	3,231
Net cash provided by financing activities	7,856	168,458
Net increase in cash and cash equivalents	39,032	-59,716
Cash and cash equivalents:
Beginning of period	26,025	100,843
End of period	65,057	41,127
Supplemental disclosures of cash flow information:
Cash paid for interest	2,960
Cash received (paid) for income taxes	-340	166
Noncash investing and financing activities:
Unpaid purchases of property and equipment	847	1,444
Unpaid contingent consideration from business acquisition	16,034
Unrealized gain from available-for-sale investments	-37	260
Non-cash warrant exercises		90
Unpaid debt issuance cost		491
Proceeds receivable from the exercise of stock options	$65	$43

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	9 Months Ended
	Dec. 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 is the world’s leading provider of intelligent sensor system on chip (SoC) for Motion and Sound in consumer electronic devices. The company’s patented InvenSense Fabrication Platform and MotionFusion® technology address the emerging needs of many mass-market consumer applications via improved performance, accuracy, and intuitive motion-, gesture- and sound-based interfaces. InvenSense technology can be found in Mobile, Wearables, Smart Home, Industrial, and Automotive products.
	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 (“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 third fiscal quarter in each of the two most recent fiscal years ended on December 28, 2014 (“three months ended December 28, 2014” or “December 2014”) and December 29, 2013 (“three months ended December 29, 2013” or “December 2013”), respectively, and each quarter period included 13 weeks.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.
	The condensed consolidated balance sheet as of March 30, 2014, included herein was derived from the audited financial statements as of that date, but does not include all disclosures required by GAAP. The unaudited interim condensed consolidated financial statements, in the opinion of management, reflect all normal recurring adjustments necessary to present fairly the Company’s financial position, results of operations, comprehensive income (loss) and cash flows for the interim periods. The results of operations for the period ended December 28, 2014 is not necessarily indicative of the results to be expected for the fiscal year ending March 29, 2015 or for any future year or interim period.
	Use of Estimates
	The preparation of the Company’s Condensed Consolidated Financial Statements and notes thereto in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and notes thereto and the reported amounts of income and expenses during the reporting period. Significant estimates included in the Consolidated Financial Statements and notes thereto include income taxes, inventory valuation, stock-based compensation, goodwill, 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.
	Goodwill
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. In accordance with ASC 350, the Company reviews goodwill for impairment at the reporting unit level on an annual basis or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company performed the first step of the two-step goodwill impairment test. As the Company uses the market approach to assess impairment, its common stock price is an important component of the fair value calculation. The Company has determined that it has a single reporting unit for purposes of performing its goodwill impairment test. The Company performed its annual impairment test during the quarter ended December 28, 2014 and determined that its goodwill was not impaired.
	Concentration of Credit Risk
	The majority of the Company’s products are shipped through its distributors or contract manufacturers, which are the legal counter-party on the sale. The Company does not refer to these intermediaries as our customers in this report. When the Company references customers in this report, the Company is referring to the manufacturers of consumer electronics devices that are the end customer that these intermediaries sell the Company’s products to or that incorporate the Company’s products into finished products. These manufacturers of consumer electronics devices are categorized as our customers. For accounting purposes, any disclosure about the composition of the Company’s accounts receivable refers to the intermediary, which is the legal counter-party in a particular contract, and any disclosure about the composition of the Company’s revenue (e.g., greater than 10% customers in the footnotes to our financial statements) refers to the end customers of both those intermediaries and the Company. Some of the Company’s intermediaries may serve as such for more than one or more of the Company’s customers. As a result, attempting to compare or correlate disclosures about our accounts receivable composition as of a particular date with the disclosures regarding revenues generated by our customers for the period ending on the same date can be difficult or misleading.
	A distributor and a customer accounted for 77% and 12% of accounts receivable, respectively, at December 28, 2014. At March 30, 2014, three customers accounted for 28%, 19% and 19% of accounts receivable.
	For the three months ended December 28, 2014, two customers accounted for 45% and 24% of net revenue. For the nine months ended December 28, 2014, two customers accounted for 29% and 28% of net revenue. For the three months ended December 29, 2013, three customers accounted for 32%, 16% and 10% of net revenue. For the nine months ended December 29, 2013, one customer accounted for 32% 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 to the customer or intermediary 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 nine months ended December 28, 2014 and December 29, 2013:
		Nine Months Ended
		December 28,			December 29,
		2014			2013
		(in thousands)
	Beginning balance	$	80		$	123
	Provision for warranty		60			69
	Adjustments related to changes in estimate		55			(73	)
	Less: actual warranty costs		(68	)		(30	)
	Ending balance	$	127		$	89
	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						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted
	Net income (loss)	$	10,221		$	(12,179	)	$	(1,479	)	$	11,751
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income (loss) per share		89,779			87,047			89,026			86,145
	Diluted shares:
	Weighted-average shares used in computing basic net income (loss) per share		89,779			87,047			89,026			86,145
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		2,557			—			—			3,165
	Common stock warrants		—			—			—			54
	Weighted-average shares used in computing diluted net income (loss) per share		92,336			87,047			89,026			89,364
	Net income (loss) per share
	Basic	$	0.11		$	(0.14	)	$	(0.02	)	$	0.14
	Diluted	$	0.11		$	(0.14	)	$	(0.02	)	$	0.13
	The following summarizes the potentially dilutive securities outstanding at the end of each period that were excluded from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive:
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(in thousands)
	Employee stock options		2,785			9,016			8,621			2,922
	Unvested restricted stock units		738			2,369			3,637			830
	Total antidilutive securities		3,523			11,385			12,258			3,752
	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”). On or after August 1, 2018 until the maturity date, the Notes may be converted at the option of the holders under certain circumstances. 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 (see Note 5).
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	9 Months Ended
	Dec. 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 December 28, 2014, of the $65.1 million of the Company’s cash and cash equivalents, $47.9 million was cash and $17.2 million was cash equivalents invested in money market funds and commercial paper. At December 28, 2014, $47.0 million of the $65.1 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 December 28, 2014, the Company had short-term available-for-sale investments of $103.9 million and long-term available-for-sale investments of $3.5 million totaling $107.4 million. Long-term investments as of December 28, 2014 of $3.5 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:
	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.
	December 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 December 28, 2014.
					Quoted Prices		Significant			Significant
					in Active		Other			Other
		December 28,			Markets for		Observable			Unobservable
		2014			Identical		Inputs			Inputs
		Balance			Assets Level 1		Level 2			Level 3
		(in thousands)
	Assets
	Money Market Funds	$	17,244		$	17,244	$	—		$	—
	Corporate Notes and Bonds		103,766			—		103,766			—
	Municipal Notes and Bonds		1,098			—		1,098			—
	U.S. Agency Securities		2,500			—		2,500			—
	Total investments	$	124,608		$	17,244	$	107,364		$	—
	Liabilities
	Contingent consideration	$	16,909							$	16,909
	Assets
	Cash equivalents	$	17,244		$	17,244	$	—		$	—
	Short-term investments		103,863			—		103,863			—
	Long-term investments		3,501			—		3,501			—
	Total investments	$	124,608		$	17,244	$	107,364		$	—
	Liabilities
	Accrued liabilities	$	14,183							$	14,183
	Long-term liabilities		2,726								2,726
	Total contingent consideration	$	16,909		$	—	$	—		$	16,909
		December 28,			Gross		Gross			December 28,
		2014			Unrealized		Unrealized			2014
		Amortized Cost			Gain		Loss			Estimated FMV
	Corporate Notes and Bonds	$	103,803		$	6	$	(43	)	$	103,766
	Municipal Notes and Bonds		1,097			1		—			1,098
	U.S. Agency Securities		2,500			—		—			2,500
	Total Available-for-sale investments	$	107,400		$	7	$	(43	)	$	107,364
	Cash equivalents										17,244
	Total Aggregate Fair Value									$	124,608
	There were no transfers of assets measured at fair value between Level 1 and Level 2 during the nine months ended December 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.
					Quoted Prices		Significant			Significant
					in Active		Other			Other
		March 30,			Markets for		Observable			Unobservable
		2014			Identical		Inputs			Inputs
		Balance			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.
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 nine months ended December 28, 2014:
	Nine Months Ended
	December 28, 2014
	(in thousands)
Beginning balance	$	—
Add: Contingent consideration in connection with acquisitions		16,034
Payments made on contingent liabilities		—
Change in fair value and other		875
Ending balance	$	16,909
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 achieving 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.

Balance_Sheet_Details

Balance Sheet Details	9 Months Ended
	Dec. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Details	3. Balance Sheet Details
	Inventories
	Inventories at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014
		(in thousands)
	Work in process	$	44,270		$	58,641
	Finished goods		23,531			14,391
	Total inventories	$	67,801		$	73,032
	Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014
		(in thousands)
	Prepaid expenses	$	5,032		$	3,495
	Income tax receivable		7,565			5,932
	Other receivables		3,099			5,356
	Deferred tax assets		2,571			2,487
	Advance to vendors		843			1,026
	Other current assets		951			1,291
	Total prepaid expenses and other current assets	$	20,061		$	19,587
	Property and Equipment
	Property and equipment at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014,
		(in thousands)
	Production and lab equipment	$	44,171		$	25,890
	Computer equipment and software		5,864			4,335
	Equipment under construction		3,712			2,298
	Leasehold improvements and furniture and fixtures		7,113			3,918
	Subtotal		60,860			36,441
	Accumulated depreciation and amortization		(18,323	)		(11,202	)
	Property and equipment—net	$	42,537		$	25,239
	Depreciation expense for the three and nine months ended December 28, 2014 was $3.0 million and $7.4 million, respectively. Depreciation expense for the three and nine months ended December 29, 2013 was $1.4 million and $2.9 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 December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014,
		(in thousands)
	Contingent consideration	$	14,183		$	—
	Payroll-related expenses		6,759			4,207
	Bonuses		3,837			3,019
	Legal fees		579			2,527
	Accrued contractual coupon interest payable on convertible senior notes		488			1,158
	Deferred revenue		1,574			800
	Income tax payable		176			117
	Other accrued liabilities		5,861			3,157
	Total accrued liabilities	$	33,457		$	14,985

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Dec. 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 2021.
	Future minimum lease payments under operating leases as of December 28, 2014 are as follows:
		Amount
		(in thousands)
	Fiscal Years Ending:
	2015 (remainder)	$	1,398
	2016		6,300
	2017		6,384
	2018		6,327
	2019		6,443
	Beyond		6,617
	Total	$	33,469
	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 $1.3 million and $3.6 million for the three and nine months ended December 28, 2014, respectively. The Company’s rental expense under operating leases was approximately $1.6 million and $3.4 million for the three and nine months ended December 29, 2013, respectively.
	Legal Proceedings
	From time to time, the Company is involved in legal proceedings concerning matters arising in connection with the conduct of its business activities. The Company regularly evaluates the status of legal proceedings in which the Company is involved to assess whether a loss is probable or there is a reasonable possibility that a loss or additional loss may have been incurred and to determine if accruals are appropriate. The Company further evaluates each legal proceeding to assess whether an estimate of possible loss or range of loss can be made.
	On January 7, 2015 a purported shareholder filed a class action complaint in the U.S. District Court, Northern District of California against the Company and two of the Company’s current and former executives (the “Securities Case”). Jim McMillan, Individually and on Behalf of All Others Similarly Situated v. InvenSense, Inc., et al. Civil Action No. 3:15-cv-00084-JD. The complaint alleges that the defendants violated the federal securities laws by making materially false and misleading statements regarding our business results between July 29, 2014 and October 28, 2014, and seeks unspecified damages along with plaintiff’s costs and expenses, including attorneys’ fees. A second complaint, William Lendales v. InvenSense, Inc. et al., Case No. 3:15-cv-00142-VC, was filed on January 12, 2015, by a different purported shareholder, in the same court, setting forth substantially the same allegations. A third complaint, Plumber & Steamfitters Local 21 Pension Fund v. InvenSense, Inc., et al., Civil Action No 5:15-cv-00249-BLF, was filed on January 16, 2015, by a different purported shareholder, in the same court, setting forth substantially the same allegations. The Company has undertaken an evaluation of these complaints.
	A fourth complaint, William B. Davis vs. InvenSense, Inc., et al., Civil Action No. 5:15-cv-00425-RMW, was filed on January 29, 2015, by a different purported shareholder, in the same court, setting forth substantially the same allegations.
	On January 13, 2015, another purported shareholder filed a shareholder derivative complaint against two of our current and former officers and several of our current directors in the U.S. District Court, Northern District of California (the “Derivative Case”). George Rollins, derivatively on behalf of InvenSense, Inc. v. Behrooz Abdi, et. al., Civil Action No 5:15-cv-00184-PSG. In this complaint, the plaintiff makes allegations similar to those presented in the Securities Case, but the plaintiff asserts various state law causes of action, including claims of breach of fiduciary duty and unjust enrichment. A second complaint, Linda Karr, derivatively on behalf of InvenSense, Inc. v. Behrooz Abdi, et. al., Civil Action No. 5:15-cv-00200-NC, was filed on January 14, 2015, by a different purported shareholder, in the same court, setting forth substantially the same allegations. The Company has undertaken an evaluation of these complaints

Convertible_Senior_Notes

Convertible Senior Notes	9 Months Ended
	Dec. 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 December 28, 2014 the remaining amortization period of the debt discount and the issuance costs is 3.9 years. The effective interest rate of the Notes is 7.84% per annum (1.75% coupon rate plus 6.09% of non-cash accretion expense).
	Convertible 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:
		December 28, 2014
		(in thousands)
	Principal amount of the Notes	$	175,000
	Unamortized discount on the Notes		33,896
	Net carrying value	$	141,104
	The following table presents the amount of interest expense recognized related to the Notes for the three and nine months ended December 28, 2014:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(in thousands)
	Contractual coupon interest expense	$	764	$	394	$	2,296	$	394
	Accretion of debt discount		1,875		1,062		5,522		1,062
	Amortization of debt issuance costs		13		7		38		7
	Total interest expense related to the Notes	$	2,652	$	1,463	$	7,856	$	1,463
	As of December 28, 2014, our aggregate future principal debt maturities are as follows (in thousands):
	Fiscal Year	December 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 December 28, 2014 was $174.3 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	9 Months Ended
	Dec. 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		(1,632	)		1,632			19.85
	Exercised options					(1,024	)		6.27
	Cancelled options		401			(401	)		11.98
	Outstanding — December 28, 2014		14,897			8,483		$	12.62			7.59		$	39,188
	Vested and expected to vest — December 28, 2014					7,569		$	12.19			7.46		$	37,497
	Vested — December 28, 2014					3,522		$	9.23			6.52		$	25,544
	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 nine months ended December 28, 2014 was $2.3 million and $16.5 million respectively. The aggregate intrinsic value of the stock options exercised during the three and nine months ended December 29, 2013 was $5.8 million and $28.5 million respectively. The aggregate intrinsic value 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 $18.0 million, and $19.9 million at December 28, 2014 and December 29, 2013, respectively, and will be amortized over a weighted-average remaining period of approximately 2.5 and 2.9 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 nine months ended December 28, 2014 and December 29, 2013.
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
	Expected term (in years)		5			4.8			4.5			4.7
	Volatility		45.9	%		40.5	%		42.1	%		41.5	%
	Risk-free interest rate		1.6	%		1	%		1.5	%		1.2	%
	Dividend rate		0	%		0	%		0	%		0	%
	The weighted average fair value of the stock options granted was $6.65 and $7.28 per share for the three and nine months ended December 28, 2014, respectively. The weighted average fair value of the stock options granted was $6.61 and $5.76 per share for the three and nine months ended December 29, 2013, respectively.
	Restricted Stock Units and Restricted Stock
	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows:
					Weighted Average
					Grant Date Fair
	Restricted stock units and restricted stock activities	Shares			Value Per Share
		(in thousands, except per share amount)
	Unvested at March 30, 2014		3,325		$	16.63
	Granted		1,213			21.08
	Released		(534	)		14.32
	Forfeited		(235	)		17.42
	Unvested at December 28, 2014		3,769		$	18.34
	Restricted stock units and restricted stock granted to employees are generally subject to the employee’s continued service to the Company over that period. The fair value of restricted stock units and restricted stock is determined using the fair value of the Company’s common stock on the date of the grant. Compensation expense is generally recognized on a straight-line basis over the requisite service period of each grant adjusted for estimated forfeitures. At December 28, 2014, there was approximately $44.4 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 3.0 years. The weighted-average grant-date fair value per share of restricted stock units and restricted stock awarded in the nine months ended December 28, 2014 and December 29, 2013 was $21.08 and $15.55, respectively.
	Common Stock
	As of December 28, 2014 and March 30, 2014, common stock reserved for future issuance was as follows:
	Common stock reserved for issuance	December 28, 2014			March 30, 2014,
		(in thousands)
	Stock plans
	Outstanding stock options		8,483			8,276
	Outstanding restricted stock units and restricted stocks		3,769			3,325
	Reserved for future equity incentive grants		11,022			9,697
			23,274			21,298
	Purchase plan		230			400
	Warrants to purchase common stock		8,000			7,995
	Total common stock reserved for future issuances		31,504			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 nine months duration.
	An aggregate of 400,000 shares of common stock were reserved for issuance to employees under the Purchase Plan. As of December 28, 2014, 170,000 shares had been purchased.
	Stock-Based Compensation Expense
	Total employee stock-based compensation costs for the Company’s stock plans for the three and nine months ended December 28, 2014 and December 29, 2013 are as follows:
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
	2014			2013			2014			2013
	(in thousands)
Cost of revenue	$	589		$	349		$	1,900		$	845
Research and development		3,821			1,665			10,536			3,941
Selling, general and administrative		3,890			2,705			10,501			6,110
Total stock-based compensation expense	$	8,300		$	4,719		$	22,937		$	10,896

Income_Taxes

Income Taxes	9 Months Ended
	Dec. 28, 2014
Income Tax Disclosure [Abstract]
Income Taxes	7. Income Taxes
	In the three and nine months ended December 28, 2014, the Company recorded an income tax provision (benefit) of ($2.7) million and ($1.9) million respectively. In the three and nine months ended December 29, 2013, the Company recorded an income tax provision (benefit) of $(2.6) million and $1.2 million respectively. 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 and the extension of 2014 R&D Tax Credit. The Tax Increase Prevention Act of 2014(H.R.5771), signed into law by the President in December 2014, extends the 2014 R&D Tax Credit retroactively.
	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 December 28, 2014 because such earnings are to be reinvested indefinitely.
	The Company has recorded $11.6 million of uncertain tax positions within “Other long-term liabilities” on the condensed consolidated balance sheet as at December 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_Combinations

Business Combinations	9 Months Ended
	Dec. 28, 2014
Business Combinations [Abstract]
Business Combinations	8. Business Combinations
	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 (RSUs) with a fair value of $6.6 million, to certain Movea employees. The RSUs will vest over a five 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 before December 29, 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 and recorded in accrued liabilities. The product development milestone of $5.0 million was achieved in the quarter ended December 28, 2014 and the payment is expected to be made in the fourth quarter of fiscal 2015. The difference between the contractual amount of $5.0 million and the fair value of this contingent consideration was recorded in the research and development expense for the three months ended December 28, 2014.
	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						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
	Net revenue	$	115,864		$	67,755		$	273,414		$	196,030
	Net income (loss)	$	10,221		$	(14,231	)	$	(4,496	)	$	5,024
	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 $25.9 million. The total purchase price, as presented in the table below, consists of (i) cash of $11.4 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 (RSUs 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	$	11,379
	Issuance of common stock		5,703
	Contingent consideration		7,634
	Fair value of previously held 4.57% equity interest		1,215
		$	25,931
	Preliminary allocation of purchase price:
	Current assets	$	392
	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	$	25,931
	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 before December 29, 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 development milestone of $3 million was achieved by the quarter ended December 28, 2014 and the payment is expected to be made in the fourth quarter of fiscal 2015. The difference between the contractual amount of $3.0 million and the fair value of this contingent consideration was recorded in the research and development expense for the three months ended December 28, 2014.
	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	9 Months Ended
	Dec. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	9. Goodwill and Purchased Intangible Assets
	The Company monitors the recoverability of goodwill recorded in connection with acquisitions annually, or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company performed the annual goodwill impairment analysis during the third quarter of fiscal year 2015 and concluded that goodwill was not impaired.
	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 December 28, 2014	$	139,175
	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. The costs that the Company incurred on the in-process research and development projects after the acquisition were expensed. During the second quarter of fiscal 2015, the Company recorded $0.8 million of impairment on in-process research and development on one of the ADI acquisition projects.
	Amortization for purchased intangible assets for the three months and nine months ended December 28, 2014 was approximately $2.0 million and $4.9 million respectively. Amortization for acquired intangible assets was approximately $0.8 million for both the three and nine months ended December 29, 2013. The following table represents intangible assets and accumulated amortization:
		December 28, 2014
				Accumulated
		Gross		Amortization		Net
		(in thousands)
	Developed technology	$	44,320	$	6,719	$	37,601
	Customer relationships		1,560		260		1,300
	Total intangible assets subject to amortization	$	45,880	$	6,979	$	38,901
		30-Mar-14
				Accumulated
		Gross		Amortization		Net
		(in thousands)
	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 December 28, 2014 is as follows:
		Estimated
		Amortization
	Fiscal Year	(in thousands)
	2015 (remaining 3 months)	$	2,034
	2016		8,136
	2017		8,136
	2018		8,136
	2019		8,136
	Thereafter		4,323
	Total	$	38,901

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Dec. 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 is the world’s leading provider of intelligent sensor system on chip (SoC) for Motion and Sound in consumer electronic devices. The company’s patented InvenSense Fabrication Platform and MotionFusion® technology address the emerging needs of many mass-market consumer applications via improved performance, accuracy, and intuitive motion-, gesture- and sound-based interfaces. InvenSense technology can be found in Mobile, Wearables, Smart Home, Industrial, and Automotive products.
	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 (“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 third fiscal quarter in each of the two most recent fiscal years ended on December 28, 2014 (“three months ended December 28, 2014” or “December 2014”) and December 29, 2013 (“three months ended December 29, 2013” or “December 2013”), respectively, and each quarter period included 13 weeks.
Basis of Presentation	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations.
	The condensed consolidated balance sheet as of March 30, 2014, included herein was derived from the audited financial statements as of that date, but does not include all disclosures required by GAAP. The unaudited interim condensed consolidated financial statements, in the opinion of management, reflect all normal recurring adjustments necessary to present fairly the Company’s financial position, results of operations, comprehensive income (loss) and cash flows for the interim periods. The results of operations for the period ended December 28, 2014 is not necessarily indicative of the results to be expected for the fiscal year ending March 29, 2015 or for any future year or interim period.
Use of Estimates	Use of Estimates
	The preparation of the Company’s Condensed Consolidated Financial Statements and notes thereto in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and notes thereto and the reported amounts of income and expenses during the reporting period. Significant estimates included in the Consolidated Financial Statements and notes thereto include income taxes, inventory valuation, stock-based compensation, goodwill, 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.
Goodwill	Goodwill
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. In accordance with ASC 350, the Company reviews goodwill for impairment at the reporting unit level on an annual basis or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company performed the first step of the two-step goodwill impairment test. As the Company uses the market approach to assess impairment, its common stock price is an important component of the fair value calculation. The Company has determined that it has a single reporting unit for purposes of performing its goodwill impairment test. The Company performed its annual impairment test during the quarter ended December 28, 2014 and determined that its goodwill was not impaired.
Concentration of Credit Risk	Concentration of Credit Risk
	The majority of the Company’s products are shipped through its distributors or contract manufacturers, which are the legal counter-party on the sale. The Company does not refer to these intermediaries as our customers in this report. When the Company references customers in this report, the Company is referring to the manufacturers of consumer electronics devices that are the end customer that these intermediaries sell the Company’s products to or that incorporate the Company’s products into finished products. These manufacturers of consumer electronics devices are categorized as our customers. For accounting purposes, any disclosure about the composition of the Company’s accounts receivable refers to the intermediary, which is the legal counter-party in a particular contract, and any disclosure about the composition of the Company’s revenue (e.g., greater than 10% customers in the footnotes to our financial statements) refers to the end customers of both those intermediaries and the Company. Some of the Company’s intermediaries may serve as such for more than one or more of the Company’s customers. As a result, attempting to compare or correlate disclosures about our accounts receivable composition as of a particular date with the disclosures regarding revenues generated by our customers for the period ending on the same date can be difficult or misleading.
	A distributor and a customer accounted for 77% and 12% of accounts receivable, respectively, at December 28, 2014. At March 30, 2014, three customers accounted for 28%, 19% and 19% of accounts receivable.
	For the three months ended December 28, 2014, two customers accounted for 45% and 24% of net revenue. For the nine months ended December 28, 2014, two customers accounted for 29% and 28% of net revenue. For the three months ended December 29, 2013, three customers accounted for 32%, 16% and 10% of net revenue. For the nine months ended December 29, 2013, one customer accounted for 32% 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 to the customer or intermediary 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)	9 Months Ended
	Dec. 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 nine months ended December 28, 2014 and December 29, 2013:
		Nine Months Ended
		December 28,			December 29,
		2014			2013
		(in thousands)
	Beginning balance	$	80		$	123
	Provision for warranty		60			69
	Adjustments related to changes in estimate		55			(73	)
	Less: actual warranty costs		(68	)		(30	)
	Ending balance	$	127		$	89
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						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(in thousands, except per share data)
	Numerator:
	Basic and Diluted
	Net income (loss)	$	10,221		$	(12,179	)	$	(1,479	)	$	11,751
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income (loss) per share		89,779			87,047			89,026			86,145
	Diluted shares:
	Weighted-average shares used in computing basic net income (loss) per share		89,779			87,047			89,026			86,145
	Effect of potentially dilutive securities:
	Stock options and unvested restricted stock		2,557			—			—			3,165
	Common stock warrants		—			—			—			54
	Weighted-average shares used in computing diluted net income (loss) per share		92,336			87,047			89,026			89,364
	Net income (loss) per share
	Basic	$	0.11		$	(0.14	)	$	(0.02	)	$	0.14
	Diluted	$	0.11		$	(0.14	)	$	(0.02	)	$	0.13
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						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(in thousands)
	Employee stock options		2,785			9,016			8,621			2,922
	Unvested restricted stock units		738			2,369			3,637			830
	Total antidilutive securities		3,523			11,385			12,258			3,752

Cash_Equivalents_and_Available1

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments (Tables)	9 Months Ended
	Dec. 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 December 28, 2014.
					Quoted Prices		Significant			Significant
					in Active		Other			Other
		December 28,			Markets for		Observable			Unobservable
		2014			Identical		Inputs			Inputs
		Balance			Assets Level 1		Level 2			Level 3
		(in thousands)
	Assets
	Money Market Funds	$	17,244		$	17,244	$	—		$	—
	Corporate Notes and Bonds		103,766			—		103,766			—
	Municipal Notes and Bonds		1,098			—		1,098			—
	U.S. Agency Securities		2,500			—		2,500			—
	Total investments	$	124,608		$	17,244	$	107,364		$	—
	Liabilities
	Contingent consideration	$	16,909							$	16,909
	Assets
	Cash equivalents	$	17,244		$	17,244	$	—		$	—
	Short-term investments		103,863			—		103,863			—
	Long-term investments		3,501			—		3,501			—
	Total investments	$	124,608		$	17,244	$	107,364		$	—
	Liabilities
	Accrued liabilities	$	14,183							$	14,183
	Long-term liabilities		2,726								2,726
	Total contingent consideration	$	16,909		$	—	$	—		$	16,909
		December 28,			Gross		Gross			December 28,
		2014			Unrealized		Unrealized			2014
		Amortized Cost			Gain		Loss			Estimated FMV
	Corporate Notes and Bonds	$	103,803		$	6	$	(43	)	$	103,766
	Municipal Notes and Bonds		1,097			1		—			1,098
	U.S. Agency Securities		2,500			—		—			2,500
	Total Available-for-sale investments	$	107,400		$	7	$	(43	)	$	107,364
	Cash equivalents										17,244
	Total Aggregate Fair Value									$	124,608
	There were no transfers of assets measured at fair value between Level 1 and Level 2 during the nine months ended December 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.
					Quoted Prices		Significant			Significant
					in Active		Other			Other
		March 30,			Markets for		Observable			Unobservable
		2014			Identical		Inputs			Inputs
		Balance			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.
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 nine months ended December 28, 2014:
		Nine Months Ended
		December 28, 2014
		(in thousands)
	Beginning balance	$	—
	Add: Contingent consideration in connection with acquisitions		16,034
	Payments made on contingent liabilities		—
	Change in fair value and other		875
	Ending balance	$	16,909
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 achieving the milestones.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	9 Months Ended
	Dec. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	Inventories at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014
		(in thousands)
	Work in process	$	44,270		$	58,641
	Finished goods		23,531			14,391
	Total inventories	$	67,801		$	73,032
Prepaid Expenses and Other Current Assets	Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014
		(in thousands)
	Prepaid expenses	$	5,032		$	3,495
	Income tax receivable		7,565			5,932
	Other receivables		3,099			5,356
	Deferred tax assets		2,571			2,487
	Advance to vendors		843			1,026
	Other current assets		951			1,291
	Total prepaid expenses and other current assets	$	20,061		$	19,587
Property and Equipment	Property and Equipment
	Property and equipment at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014,
		(in thousands)
	Production and lab equipment	$	44,171		$	25,890
	Computer equipment and software		5,864			4,335
	Equipment under construction		3,712			2,298
	Leasehold improvements and furniture and fixtures		7,113			3,918
	Subtotal		60,860			36,441
	Accumulated depreciation and amortization		(18,323	)		(11,202	)
	Property and equipment—net	$	42,537		$	25,239
Accrued Liabilities	Accrued liabilities at December 28, 2014 and March 30, 2014 consist of the following:
		December 28, 2014			March 30, 2014,
		(in thousands)
	Contingent consideration	$	14,183		$	—
	Payroll-related expenses		6,759			4,207
	Bonuses		3,837			3,019
	Legal fees		579			2,527
	Accrued contractual coupon interest payable on convertible senior notes		488			1,158
	Deferred revenue		1,574			800
	Income tax payable		176			117
	Other accrued liabilities		5,861			3,157
	Total accrued liabilities	$	33,457		$	14,985

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Dec. 28, 2014
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments under Operating Leases	Future minimum lease payments under operating leases as of December 28, 2014 are as follows:
		Amount
		(in thousands)
	Fiscal Years Ending:
	2015 (remainder)	$	1,398
	2016		6,300
	2017		6,384
	2018		6,327
	2019		6,443
	Beyond		6,617
	Total	$	33,469

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	9 Months Ended
	Dec. 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:
		December 28, 2014
		(in thousands)
	Principal amount of the Notes	$	175,000
	Unamortized discount on the Notes		33,896
	Net carrying value	$	141,104
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 nine months ended December 28, 2014:
		Three Months Ended				Nine Months Ended
		December 28,		December 29,		December 28,		December 29,
		2014		2013		2014		2013
		(in thousands)
	Contractual coupon interest expense	$	764	$	394	$	2,296	$	394
	Accretion of debt discount		1,875		1,062		5,522		1,062
	Amortization of debt issuance costs		13		7		38		7
	Total interest expense related to the Notes	$	2,652	$	1,463	$	7,856	$	1,463
Schedule of Aggregate Future Principal Debt Maturities	As of December 28, 2014, our aggregate future principal debt maturities are as follows (in thousands):
	Fiscal Year	December 28, 2014
		(in thousands)
	2015-2018	$	—
	2019		175,000
	Total	$	175,000

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Dec. 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		(1,632	)		1,632			19.85
	Exercised options					(1,024	)		6.27
	Cancelled options		401			(401	)		11.98
	Outstanding — December 28, 2014		14,897			8,483		$	12.62			7.59		$	39,188
	Vested and expected to vest — December 28, 2014					7,569		$	12.19			7.46		$	37,497
	Vested — December 28, 2014					3,522		$	9.23			6.52		$	25,544
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 nine months ended December 28, 2014 and December 29, 2013.
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
	Expected term (in years)		5			4.8			4.5			4.7
	Volatility		45.9	%		40.5	%		42.1	%		41.5	%
	Risk-free interest rate		1.6	%		1	%		1.5	%		1.2	%
	Dividend rate		0	%		0	%		0	%		0	%
Restricted Stock Unit and Restricted Stock Activity	Restricted stock unit and restricted stock activity of the Company under the Plans are as follows:
					Weighted Average
					Grant Date Fair
	Restricted stock units and restricted stock activities	Shares			Value Per Share
		(in thousands, except per share amount)
	Unvested at March 30, 2014		3,325		$	16.63
	Granted		1,213			21.08
	Released		(534	)		14.32
	Forfeited		(235	)		17.42
	Unvested at December 28, 2014		3,769		$	18.34
Common Stock Reserved for Future Issuance	As of December 28, 2014 and March 30, 2014, common stock reserved for future issuance was as follows:
	Common stock reserved for issuance	December 28, 2014			March 30, 2014,
		(in thousands)
	Stock plans
	Outstanding stock options		8,483			8,276
	Outstanding restricted stock units and restricted stocks		3,769			3,325
	Reserved for future equity incentive grants		11,022			9,697
			23,274			21,298
	Purchase plan		230			400
	Warrants to purchase common stock		8,000			7,995
	Total common stock reserved for future issuances		31,504			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 nine months ended December 28, 2014 and December 29, 2013 are as follows:
		Three Months Ended						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
		(in thousands)
	Cost of revenue	$	589		$	349		$	1,900		$	845
	Research and development		3,821			1,665			10,536			3,941
	Selling, general and administrative		3,890			2,705			10,501			6,110
	Total stock-based compensation expense	$	8,300		$	4,719		$	22,937		$	10,896

Business_Combinations_Tables

Business Combinations (Tables)	9 Months Ended
	Dec. 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						Nine Months Ended
		December 28,			December 29,			December 28,			December 29,
		2014			2013			2014			2013
	Net revenue	$	115,864		$	67,755		$	273,414		$	196,030
	Net income (loss)	$	10,221		$	(14,231	)	$	(4,496	)	$	5,024
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	$	11,379
	Issuance of common stock		5,703
	Contingent consideration		7,634
	Fair value of previously held 4.57% equity interest		1,215
		$	25,931
	Preliminary allocation of purchase price:
	Current assets	$	392
	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	$	25,931
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)	9 Months Ended
	Dec. 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 December 28, 2014	$	139,175
Summary of Intangible Assets and Accumulated Amortization	The following table represents intangible assets and accumulated amortization:
		December 28, 2014
				Accumulated
		Gross		Amortization		Net
		(in thousands)
	Developed technology	$	44,320	$	6,719	$	37,601
	Customer relationships		1,560		260		1,300
	Total intangible assets subject to amortization	$	45,880	$	6,979	$	38,901
		30-Mar-14
				Accumulated
		Gross		Amortization		Net
		(in thousands)
	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 December 28, 2014 is as follows:
		Estimated
		Amortization
	Fiscal Year	(in thousands)
	2015 (remaining 3 months)	$	2,034
	2016		8,136
	2017		8,136
	2018		8,136
	2019		8,136
	Thereafter		4,323
	Total	$	38,901

Organization_and_Summary_of_Si3

Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended
	Dec. 28, 2014	Dec. 28, 2014	Mar. 30, 2014	Dec. 29, 2013	Dec. 29, 2013	Sep. 28, 2014	Nov. 30, 2013
			Customer	Customer	Customer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Incorporation month and year		2003-06
Goodwill impairment	$0
Convertible senior notes, issuance date		2013-11
Convertible senior notes, principal amount	175,000,000	175,000,000
Convertible senior notes, maturity date		1-Nov-18
Convertible senior notes, conversion ratio		45.683
Convertible senior notes, face amount per note	1,000	1,000
Convertible senior notes, conversion price	$21.89	$21.89
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period of Company's warranty agreements		3 years
Convertible Senior Notes Due 2018 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible senior notes, principal amount							$175,000,000
Convertible senior notes, Stated interest rate						1.75%	1.75%
Revenue [Member] | Customer Concentration Risk [Member] | Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk		10.00%
Accounts Receivable [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of major distributors		1
Number of major customers		1	3
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Distributor [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk		77.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk		12.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer One [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk			28.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer Two [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk			19.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer Three [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk			19.00%
Net Revenue [Member] | Customer Concentration Risk [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of major customers	2	2		3	1
Net Revenue [Member] | Customer Concentration Risk [Member] | Customer One [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk	45.00%	29.00%		32.00%	32.00%
Net Revenue [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk	24.00%	28.00%		16.00%
Net Revenue [Member] | Customer Concentration Risk [Member] | Customer Three [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of concentration risk				10.00%

Organization_and_Summary_of_Si4

Organization and Summary of Significant Accounting Policies - Summary of Activity Related to Product Warranty Liability (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$80	$123
Provision for warranty	60	69
Adjustments related to changes in estimate	55	-73
Less: actual warranty costs	-68	-30
Ending balance	$127	$89

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		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Basic and Diluted
Net income (loss)	$10,221	($12,179)	($1,479)	$11,751
Basic shares:
Weighted-average shares used in computing basic net income (loss) per share	89,779	87,047	89,026	86,145
Diluted shares:
Weighted-average shares used in computing basic net income (loss) per share	89,779	87,047	89,026	86,145
Effect of potentially dilutive securities:
Stock options and unvested restricted stock	2,557			3,165
Common stock warrants				54
Weighted-average shares used in computing diluted net income (loss) per share	92,336	87,047	89,026	89,364
Net income (loss) per share
Basic	$0.11	($0.14)	($0.02)	$0.14
Diluted	$0.11	($0.14)	($0.02)	$0.13

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	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	3,523	11,385	12,258	3,752
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	2,785	9,016	8,621	2,922
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	738	2,369	3,637	830

Cash_Equivalents_and_Available2

Cash Equivalents and Available-for-sale Investments, and Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 28, 2014	Mar. 30, 2014	Dec. 29, 2013	Mar. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash	65,100,000	26,000,000
Cash equivalents	47,900,000
Cash and cash equivalents	65,057,000	26,025,000	41,127,000	100,843,000
Short-term investments available-for-sale	103,900,000	91,300,000
Long-term investments available-for-sale	3,500,000	128,800,000
Investments available-for-sale total	107,400,000	220,100,000
Transfers of assets measured at fair value between Level 1 and Level 2	0	0
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash equivalents		15,300,000
Minimum [Member]
Cash and Cash Equivalents [Line Items]
Investment maturity period	1 Year	1 Year
Maximum [Member]
Cash and Cash Equivalents [Line Items]
Investment maturity period	2 Years	2 Years
Foreign Subsidiaries [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		9,800,000
Foreign Subsidiaries [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	47,000,000

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 $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Liabilities
Estimated FMV	$103,863	$91,307
Fair Value, Recurring [Member]
Assets
Fair value of assets	124,608	230,719
Fair value of assets	124,608	230,719
Liabilities
Accrued liabilities	16,909
Assets
Fair value of assets	124,608	230,719
Liabilities
Accrued liabilities	16,909
Amortized Cost	107,400	220,121
Gross Unrealized Gain	7	9
Gross Unrealized Loss	-43	-68
Estimated FMV	107,364	220,062
Fair Value, Recurring [Member] | Accrued Liabilities [Member]
Liabilities
Accrued liabilities	14,183
Liabilities
Accrued liabilities	14,183
Fair Value, Recurring [Member] | Long-term Liabilities [Member]
Liabilities
Accrued liabilities	2,726
Liabilities
Accrued liabilities	2,726
Fair Value, Recurring [Member] | Short-term Investments [Member]
Assets
Fair value of assets	103,863	91,307
Fair value of assets	103,863	91,307
Assets
Fair value of assets	103,863	91,307
Fair Value, Recurring [Member] | Long-term Investments [Member]
Assets
Fair value of assets	3,501	128,755
Fair value of assets	3,501	128,755
Assets
Fair value of assets	3,501	128,755
Fair Value, Recurring [Member] | Money Market Funds [Member]
Assets
Fair value of assets	17,244	10,657
Fair value of assets	17,244	10,657
Assets
Fair value of assets	17,244	10,657
Fair Value, Recurring [Member] | Corporate Notes and Bonds [Member]
Assets
Fair value of assets	103,766	204,683
Fair value of assets	103,766	204,683
Assets
Fair value of assets	103,766	204,683
Liabilities
Amortized Cost	103,803	204,747
Gross Unrealized Gain	6
Gross Unrealized Loss	-43	-64
Estimated FMV	103,766	204,683
Fair Value, Recurring [Member] | Municipal Notes and Bonds [Member]
Assets
Fair value of assets	1,098	3,895
Fair value of assets	1,098	3,895
Assets
Fair value of assets	1,098	3,895
Liabilities
Amortized Cost	1,097	3,888
Gross Unrealized Gain	1	7
Estimated FMV	1,098	3,895
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
Estimated FMV		8,988
Fair Value, Recurring [Member] | U.S. Agency Securities [Member]
Assets
Fair value of assets	2,500	2,496
Fair value of assets	2,500	2,496
Assets
Fair value of assets	2,500	2,496
Liabilities
Amortized Cost	2,500	2,500
Gross Unrealized Loss		-4
Estimated FMV	2,500	2,496
Fair Value, Recurring [Member] | Cash Equivalents [Member]
Assets
Fair value of assets	17,244	10,657
Fair value of assets	17,244	10,657
Assets
Fair value of assets	17,244	10,657
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Assets
Fair value of assets	17,244	10,657
Fair value of assets	17,244	10,657
Assets
Fair value of assets	17,244	10,657
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Money Market Funds [Member]
Assets
Fair value of assets	17,244	10,657
Fair value of assets	17,244	10,657
Assets
Fair value of assets	17,244	10,657
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Cash Equivalents [Member]
Assets
Fair value of assets	17,244	10,657
Fair value of assets	17,244	10,657
Assets
Fair value of assets	17,244	10,657
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Assets
Fair value of assets	107,364	220,062
Fair value of assets	107,364	220,062
Assets
Fair value of assets	107,364	220,062
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member] | Short-term Investments [Member]
Assets
Fair value of assets	103,863	91,307
Fair value of assets	103,863	91,307
Assets
Fair value of assets	103,863	91,307
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member] | Long-term Investments [Member]
Assets
Fair value of assets	3,501	128,755
Fair value of assets	3,501	128,755
Assets
Fair value of assets	3,501	128,755
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member] | Corporate Notes and Bonds [Member]
Assets
Fair value of assets	103,766	204,683
Fair value of assets	103,766	204,683
Assets
Fair value of assets	103,766	204,683
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member] | Municipal Notes and Bonds [Member]
Assets
Fair value of assets	1,098	3,895
Fair value of assets	1,098	3,895
Assets
Fair value of assets	1,098	3,895
Fair Value, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member] | Commercial Paper [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] | Significant Other Observable Inputs Level 2 [Member] | U.S. Agency Securities [Member]
Assets
Fair value of assets	2,500	2,496
Fair value of assets	2,500	2,496
Assets
Fair value of assets	2,500	2,496
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member]
Assets
Fair value of assets
Fair value of assets
Liabilities
Accrued liabilities	16,909
Assets
Fair value of assets
Liabilities
Accrued liabilities	16,909
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Accrued Liabilities [Member]
Liabilities
Accrued liabilities	14,183
Liabilities
Accrued liabilities	14,183
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] | Significant Other Unobservable Inputs Level 3 [Member] | Short-term Investments [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Long-term Investments [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Money Market Funds [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Corporate Notes and Bonds [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Municipal Notes and Bonds [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Commercial Paper [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | U.S. Agency Securities [Member]
Assets
Fair value of assets
Fair value of assets
Assets
Fair value of assets
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs Level 3 [Member] | Cash Equivalents [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 $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014
Fair Value Disclosures [Abstract]
Add: Contingent consideration in connection with acquisitions	$16,034
Payments made on contingent liabilities	0
Change in fair value and other	875
Ending balance	$16,909

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)	9 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 achieving the milestones.

Balance_Sheet_Details_Inventor

Balance Sheet Details - Inventories (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Work in process	$44,270	$58,641
Finished goods	23,531	14,391
Total inventories	$67,801	$73,032

Balance_Sheet_Details_Prepaid_

Balance Sheet Details - Prepaid Expenses and Other Current Assets (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]
Prepaid expenses	$5,032	$3,495
Income tax receivable	7,565	5,932
Other receivables	3,099	5,356
Deferred tax assets	2,571	2,487
Advance to vendors	843	1,026
Other current assets	951	1,291
Total prepaid expenses and other current assets	$20,061	$19,587

Balance_Sheet_Details_Property

Balance Sheet Details - Property and Equipment (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Subtotal	$60,860	$36,441
Accumulated depreciation and amortization	-18,323	-11,202
Property and equipment-net	42,537	25,239
Production and Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Subtotal	44,171	25,890
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Subtotal	5,864	4,335
Equipment Under Construction [Member]
Property, Plant and Equipment [Line Items]
Subtotal	3,712	2,298
Leasehold Improvements and Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Subtotal	$7,113	$3,918

Balance_Sheet_Details_Addition

Balance Sheet Details - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Balance Sheet Related Disclosures [Abstract]
Depreciation expense	$3,000	$1,400	$7,356	$2,933

Balance_Sheet_Details_Accrued_

Balance Sheet Details - Accrued Liabilities (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Accrued Liabilities [Line Items]
Contingent consideration	$14,183
Payroll-related expenses	6,759	4,207
Bonuses	3,837	3,019
Legal fees	579	2,527
Deferred revenue	1,574	800
Income tax payable	176	117
Other accrued liabilities	5,861	3,157
Total accrued liabilities	33,457	14,985
Convertible Senior Notes [Member]
Accrued Liabilities [Line Items]
Accrued contractual coupon interest payable on convertible senior notes	$488	$1,158

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 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 2021.
Operating leases, expiration date			2021
Rental expense	$1.30	$1.60	$3.60	$3.40

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)	Dec. 28, 2014
In Thousands, unless otherwise specified
Leases [Abstract]
2015 (remainder)	$1,398
2016	6,300
2017	6,384
2018	6,327
2019	6,443
Beyond	6,617
Total	$33,469

Convertible_Senior_Notes_Addit

Convertible Senior Notes - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended		0 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Nov. 30, 2013	Dec. 28, 2014	Dec. 29, 2013	Nov. 07, 2013	Sep. 28, 2014
				Hedge_Strategies
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, 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		169,750,000
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
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, remaining amortization period		3 years 10 months 24 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%
Aggregate price for convertible note hedge			39,118,000
Proceeds from sale of warrants			25,643,000
Convertible Notes Hedges Purchased [Member]
Debt Instrument [Line Items]
Call options				8
Common stock at exercise price				$21.89
Conversion of shares in convertible note				0.045683
Aggregate price for convertible note hedge				39,100,000
Significant Other Observable Inputs Level 2 [Member]
Debt Instrument [Line Items]
Fair value of convertible notes		174,300,000
Call Options [Member]
Debt Instrument [Line Items]
Call options				8
Common stock at exercise price				$28.66
Proceeds from sale of warrants				25,600,000
Convertible Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Convertible senior notes, principal amount	175,000,000
Convertible senior notes, Stated interest rate	1.75%				1.75%
Equity Component [Member]
Debt Instrument [Line Items]
Convertible senior notes, issuance cost		2,500,000
Debt Discount [Member]
Debt Instrument [Line Items]
Convertible senior notes, issuance cost		3,000,000
Other Non-current Assets [Member]
Debt Instrument [Line Items]
Convertible senior notes, issuance cost		250,000
Coupon Rate Plus [Member]
Debt Instrument [Line Items]
Convertible senior notes, effective interest rate		1.75%
Non-Cash Accretion Expense [Member]
Debt Instrument [Line Items]
Convertible senior notes, effective interest rate		6.09%
Condition One [Member]
Debt Instrument [Line Items]
Threshold trading days		20
Threshold consecutive trading days		30 days
Threshold percentage of conversion price		130.00%
Second Condition [Member]
Debt Instrument [Line Items]
Threshold trading days		5
Threshold consecutive trading days		5 days
Threshold percentage of conversion price		98.00%
Convertible senior notes, face amount per note		$1,000

Convertible_Senior_Notes_Summa

Convertible Senior Notes - Summary of Principal Amounts and Related Unamortized Discount on Notes (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Principal amount of the Notes	$175,000
Unamortized discount on the Notes	33,896
Net carrying value	$141,104	$135,583

Convertible_Senior_Notes_Sched

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to Notes (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Debt Disclosure [Abstract]
Contractual coupon interest expense	$764	$394	$2,296	$394
Accretion of debt discount	1,875	1,062	5,522	1,062
Amortization of debt issuance costs	13	7	38	7
Total interest expense related to the Notes	$2,652	$1,463	$7,856	$1,463

Convertible_Senior_Notes_Sched1

Convertible Senior Notes - Schedule of Aggregate Future Principal Debt Maturities (Detail) (USD $)	Dec. 28, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
2015-2018	$0
2019	175,000
Total	$175,000

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013	Jul. 31, 2011	Mar. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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	$2.30	$5.80	$16.50	$28.50
Unamortized stock-based compensation expense, reduced for estimated forfeitures and related to non-vested options	18	19.9	18	19.9
Unrecognized expense of stock option, period for recognition			2 years 6 months	2 years 10 months 24 days
Weighted average fair value of stock options granted per share	$6.65	$6.61	$7.28	$5.76
Shares reserved for issuance under the Purchase Plan	31,504,000		31,504,000			29,693,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's common stock for owners, more than			10.00%
2013 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription percentage	10.00%		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 nine months duration.
Purchase price of stock under the Purchase Plan			85.00%
Shares purchased			170,000
Shares reserved for issuance under the Purchase Plan	230,000		230,000			400,000
2011 Stock Incentive Plan [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
Restricted Stock Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense of stock option, period for recognition			3 years
Total unrecognized compensation cost	$44.40		$44.40
Weighted-average grant-date fair value per share			$21.08	$15.55
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			4 years

Stockholders_Equity_Stock_Opti

Stockholders' Equity - Stock Option Activities (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 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	-1,632
Options Available for Grant, Options exercised
Options Available for Grant, Options canceled	401
Options Available for Grant, Ending Balance	14,897
Options Issued and Outstanding, Beginning Balance	8,276
Options Issued and Outstanding, Options granted	1,632
Options Issued and Outstanding, Options exercised	-1,024
Options Issued and Outstanding, Options canceled	-401
Options Issued and Outstanding, Ending Balance	8,483
Options Issued and Outstanding, Vested and expected to vest	7,569
Options Issued and Outstanding, Vested	3,522
Weighted-Average Exercise Price, Beginning Balance	$10.37
Weighted-Average Exercise Price, Options granted	$19.85
Weighted-Average Exercise Price, Options exercised	$6.27
Weighted-Average Exercise Price, Options canceled	$11.98
Weighted-Average Exercise Price, Ending Balance	$12.62
Weighted-Average Exercise Price, Vested and expected to vest	$12.19
Weighted-Average Exercise Price, Vested	$9.23
Weighted- Average Remaining Contractual Term (In Years), Balance	7 years 7 months 2 days	7 years 10 months 13 days
Weighted-Average Remaining Contractual Term (In Years), Vested and expected to vest	7 years 5 months 16 days
Weighted-Average Remaining Contractual Term (In Years), Vested	6 years 6 months 7 days
Aggregate Intrinsic Value, Beginning Balance	$102,072
Aggregate Intrinsic Value, Ending Balance	39,188
Aggregate Intrinsic Value, Vested and expected to vest	37,497
Aggregate Intrinsic Value, Vested	$25,544

Stockholders_Equity_WeightedAv

Stockholders' Equity - Weighted-Average Assumptions in Determining Stock-Based Compensation Expense Options Granted (Detail) (Employee Stock Options [Member])	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Employee Stock Options [Member]
Expected term (in years)	5 years	4 years 9 months 18 days	4 years 6 months	4 years 8 months 12 days
Volatility	45.90%	40.50%	42.10%	41.50%
Risk-free interest rate	1.60%	1.00%	1.50%	1.20%
Dividend rate	0.00%	0.00%	0.00%	0.00%

Stockholders_Equity_Restricted

Stockholders' Equity - Restricted Stock Unit and Restricted Stock Activity (Detail) (Restricted Stock Units and Restricted Stock [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2014	Dec. 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	1,213
Shares, Released	-534
Shares, Forfeited	-235
Shares Unvested, Ending period	3,769
Weighted average grant date fair value per share, Unvested Beginning period	$16.63
Weighted average grant date fair value per share, Granted	$21.08	$15.55
Weighted average grant date fair value per share, Released	$14.32
Weighted average grant date fair value per share, Forfeited	$17.42
Weighted average grant date fair value per share, Unvested Ending period	$18.34

Stockholders_Equity_Common_Sto

Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance	23,274	21,298
Warrants to purchase common stock	8,000	7,995
Total common stock reserved for future issuances	31,504	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	230	400
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance	8,483	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	3,769	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	11,022	9,697

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Total Stock-Based Compensation Costs (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$8,300	$4,719	$22,937	$10,896
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	589	349	1,900	845
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	3,821	1,665	10,536	3,941
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$3,890	$2,705	$10,501	$6,110

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	($2,738,000)	($2,599,000)	($1,856,000)	$1,154,000
Uncertain tax positions within Other long-term liabilities	$11,600,000		$11,600,000

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended	3 Months Ended	0 Months Ended
	Jul. 22, 2014	Dec. 28, 2014	Dec. 28, 2014	Aug. 29, 2014
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment		14,183,000	$14,183,000
Movea S.A [Member]
Business Acquisition [Line Items]
Business acquisition, effective date		22-Jul-14
Percentage of equity interest acquired		100.00%	100.00%
Cash consideration	60,900,000
Business acquisition, additional contingent cash payment	13,000,000
Business acquisition, contingent cash payment	8,400,000
Business acquisition, purchase price	69,300,000
Movea S.A [Member] | Accrued Liabilities [Member]
Business Acquisition [Line Items]
Business acquisition, contingent cash payment	8,400,000
Movea S.A [Member] | Research and Development [Member]
Business Acquisition [Line Items]
Difference between the contractual amount and the fair value of contingent consideration			5,000,000
Movea S.A [Member] | 2011 Stock Incentive Plan [Member] | Unvested Restricted Stock Units [Member]
Business Acquisition [Line Items]
Fair value of RSUs granted	6,600,000
RSUs vesting period	5 years
Movea S.A [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Estimated useful life		5 years
Fair value of intangible assets	7,200,000	7,200,000	7,200,000
Movea S.A [Member] | Design win [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment	8,000,000
Movea S.A [Member] | Product Development [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment	5,000,000	5,000,000	5,000,000
Trusted Positioning, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, effective date		29-Aug-14
Cash consideration				11,379,000
Business acquisition, contingent cash payment				7,634,000
Fair value of investments		300,000		1,215,000
Percentage of common stock acquired				4.57%
Purchase consideration remaining outstanding common stock				25,931,000
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
Trusted Positioning, Inc. [Member] | Accrued Liabilities [Member]
Business Acquisition [Line Items]
Business acquisition, contingent cash payment				4,900,000
Trusted Positioning, Inc. [Member] | Research and Development [Member]
Business Acquisition [Line Items]
Difference between the contractual amount and the fair value of contingent consideration			3,000,000
Trusted Positioning, Inc. [Member] | Other long-term liabilities [Member]
Business Acquisition [Line Items]
Business acquisition, contingent cash payment				2,700,000
Trusted Positioning, Inc. [Member] | 2011 Stock Incentive Plan [Member] | Unvested Restricted Stock Units [Member]
Business Acquisition [Line Items]
Fair value of RSUs granted				5,000,000
RSUs vesting period				5 years
Trusted Positioning, Inc. [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Estimated useful life		5 years
Fair value of intangible assets		8,600,000	8,600,000	8,600,000
Trusted Positioning, Inc. [Member] | Design win [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment				5,000,000
Trusted Positioning, Inc. [Member] | Development [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment		3,000,000	3,000,000	3,000,000
Trusted Positioning, Inc. [Member] | Development of cloud [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment				2,000,000
Trusted Positioning, Inc. [Member] | Deployment of cloud [Member]
Business Acquisition [Line Items]
Business acquisition, additional contingent cash payment				2,000,000
Analog Devices, Inc. [Member]
Business Acquisition [Line Items]
Contingent expense reimbursements		2,200,000
Fair value of intangible assets		37,400,000	37,400,000
Analog Devices, Inc. [Member] | Forecast [Member]
Business Acquisition [Line Items]
Business acquisition, contingent cash payment		70,000,000	70,000,000
Business acquisition, purchase price			100,000,000
Contingent expense reimbursements			2,200,000
Business acquisition, fair value of contingent consideration		0	0
Analog Devices, Inc. [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Estimated useful life		6 years
Fair value of intangible assets		28,520,000	$28,520,000

Business_Combinations_Summary_

Business Combinations - Summary of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $)	0 Months Ended	9 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Aug. 29, 2014	Dec. 28, 2014	Jul. 22, 2014	Mar. 30, 2014
Preliminary allocation of purchase price:
Goodwill		$139,175		$50,952
Goodwill		139,175		50,952
Trusted Positioning, Inc. [Member]
Business Acquisition [Line Items]
Cash consideration	11,379
Issuance of common stock	5,703
Property and equipment, net	50
Contingent consideration	7,634
Fair value of previously held 4.57% equity interest	1,215	300
Purchase Consideration including equity interest previously held	25,931
Preliminary allocation of purchase price:
Current assets	392
Fixed assets	50
Other non-current assets	546
Goodwill	19,893
Current liabilities	-1,247
Long-term liabilities	-2,303
Total purchase price	25,931
Goodwill	19,893
Total purchase price	25,931
Trusted Positioning, Inc. [Member] | Developed Technology [Member]
Preliminary allocation of purchase price:
Intangible assets	8,600	8,600
Intangible assets	8,600	8,600
Analog Devices, Inc. [Member]
Business Acquisition [Line Items]
Inventories		5,107
Property and equipment, net		4,339
Preliminary allocation of purchase price:
Fixed assets		4,339
Intangible assets		37,400
Goodwill		50,952
Total purchase price		97,808
Intangible assets		37,400
Goodwill		50,952
Total assets acquired		97,808
Total purchase price		97,808
Analog Devices, Inc. [Member] | Developed Technology [Member]
Preliminary allocation of purchase price:
Intangible assets		28,520
Intangible assets		28,520
Analog Devices, Inc. [Member] | In-Process Research And Development [Member]
Preliminary allocation of purchase price:
Intangible assets		7,330
Intangible assets		7,330
Analog Devices, Inc. [Member] | Customer Relationships [Member]
Preliminary allocation of purchase price:
Intangible assets		1,560
Intangible assets		1,560
Movea S.A [Member]
Business Acquisition [Line Items]
Cash consideration			60,900
Property and equipment, net			209
Contingent consideration			8,400
Purchase consideration			69,300
Preliminary allocation of purchase price:
Current assets			3,082
Fixed assets			209
Other non-current assets			592
Goodwill			68,330
Current liabilities			-5,016
Long-term liabilities			-5,097
Total purchase price			69,300
Goodwill			68,330
Total purchase price			69,300
Movea S.A [Member] | Developed Technology [Member]
Preliminary allocation of purchase price:
Intangible assets		7,200	7,200
Intangible assets		$7,200	$7,200

Business_Combinations_Summary_1

Business Combinations - Summary of Estimated Fair Value and Useful Lives of Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Jul. 22, 2014	Aug. 29, 2014
Movea S.A [Member] | Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$7,200	$7,200
Estimated useful life	5 years
Trusted Positioning, Inc. [Member] | Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	8,600		8,600
Estimated useful life	5 years
Analog Devices, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	37,400
Analog Devices, Inc. [Member] | Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	28,520
Estimated useful life	6 years
Analog Devices, Inc. [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$1,560
Estimated useful life	7 years

Business_Combinations_Summary_2

Business Combinations - Summary of Unaudited Proforma of Combined Financial Information (Detail) (Movea S.A [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Movea S.A [Member]
Business Acquisition [Line Items]
Net revenue	$115,864	$67,755	$273,414	$196,030
Net income (loss)	$10,221	($14,231)	($4,496)	$5,024

Business_Combinations_Summary_3

Business Combinations - Summary of Purchase Price of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2014	Aug. 29, 2014
Trusted Positioning, Inc. [Member]
Business Acquisition [Line Items]
Percentage of common stock acquired		4.57%
Analog Devices, Inc. [Member]
Business Acquisition [Line Items]
Contingent expense reimbursements	$2.20

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Summary of Activity Related to Carrying Value of Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Mar. 30, 2014	Jul. 22, 2014	Aug. 29, 2014
Goodwill [Line Items]
Beginning balance		$50,952
Ending balance	139,175	50,952
Movea S.A [Member]
Goodwill [Line Items]
Beginning balance			68,330
Goodwill recorded in connection with the acquisition	68,330
Ending balance			68,330
Trusted Positioning, Inc. [Member]
Goodwill [Line Items]
Beginning balance				19,893
Goodwill recorded in connection with the acquisition	19,893
Ending balance				$19,893

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013	Sep. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Write-off of in-process research and development			$770
Amortization for acquired intangible assets	2,000	800	4,929	829
In-Process Research And Development [Member]
Finite-Lived Intangible Assets [Line Items]
Write-off of in-process research and development					$800

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangible Assets - Summary of Intangible Assets and Accumulated Amortization (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$45,880	$30,080
Intangible assets, Accumulated Amortization	6,979	2,073
Intangible assets, Net	38,901	28,007
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	44,320	28,520
Intangible assets, Accumulated Amortization	6,719	1,980
Intangible assets, Net	37,601	26,540
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	1,560	1,560
Intangible assets, Accumulated Amortization	260	93
Intangible assets, Net	$1,300	$1,467

Goodwill_and_Purchased_Intangi5

Goodwill and Purchased Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)	Dec. 28, 2014	Mar. 30, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining 3 months)	$2,034
2016	8,136
2017	8,136
2018	8,136
2019	8,136
Thereafter	4,323
Intangible assets, Net	$38,901	$28,007