Applied Micro Circuits (AMCC) 10-Q 28 Jan 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Dec. 31, 2013	Jan. 24, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'APPLIED MICRO CIRCUITS CORP	'
Entity Central Index Key	'0000711065	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Dec-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Current Fiscal Year End Date	'--03-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	74,177,049

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$23,630	$19,065	[1]
Short-term investments-available-for-sale	50,654	66,411	[1]
Accounts receivable, net	28,800	24,575	[1]
Inventories	10,482	12,900	[1]
Assets held for sale	14,260	0
Other current assets	17,829	17,998	[1]
Total current assets	145,655	140,949	[1]
Property and equipment, net	20,172	34,391	[1]
Goodwill	11,425	13,183	[1]
Purchased intangibles	167	11,991	[1]
Other assets	7,842	10,866	[1]
Total assets	185,261	211,380	[1]
Current liabilities:	'	'
Accounts payable	13,210	17,650	[1]
Accrued payroll and related expenses	6,398	6,158	[1]
Veloce accrued liability	57,960	78,082	[1]
Other accrued liabilities	11,178	10,730	[1]
Deferred revenue	888	1,469	[1]
Total current liabilities	89,634	114,089	[1]
Veloce and other non-current liabilities	3,511	15,787	[1]
Commitments and contingencies (Note 7)	'	'	[1]
Stockholders’ equity:	'	'
Preferred stock, $0.01 par value: Authorized shares - 2,000, none issued and outstanding	0	0	[1]
Common stock, $0.01 par value: Authorized shares - 375,000 at December 31, 2013 and March 31, 2013; Issued and outstanding shares - 74,171 at December 31, 2013 and 67,952 at March 31, 2013	740	680	[1]
Additional paid-in capital	5,971,775	5,926,630	[1]
Accumulated other comprehensive loss	-6,518	-737	[1]
Accumulated deficit	-5,873,881	-5,845,069	[1]
Total stockholders’ equity	92,116	81,504	[1]
Total liabilities and stockholders’ equity	$185,261	$211,380	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Mar. 31, 2013
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	375,000,000	375,000,000
Common stock, shares issued	74,171,000	67,952,000
Common stock, shares outstanding	74,171,000	67,952,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]	'	'	'	'
Net revenues	$54,844	$51,698	$164,379	$139,316
Cost of revenues	21,644	22,958	65,383	61,874
Gross profit	33,200	28,740	98,996	77,442
Operating expenses:	'	'	'	'
Research and development	29,870	82,711	120,926	151,865
Selling, general and administrative	10,930	12,675	29,602	38,676
Gain on sale of TPack	0	0	-19,699	0
Amortization	62	338	254	1,589
Restructuring charges, net	38	6,218	1,130	6,218
Total operating expenses	40,900	101,942	132,213	198,348
Operating loss	-7,700	-73,202	-33,217	-120,906
Interest income (expense), net	525	892	4,679	3,316
Other income (expense), net	92	1,366	309	1,539
Loss before income taxes	-7,083	-70,944	-28,229	-116,051
Income tax expense	201	618	581	458
Net loss	($7,284)	($71,562)	($28,810)	($116,509)
Basic and diluted net loss per share (in dollars per share)	($0.10)	($1.08)	($0.40)	($1.81)
Shares used in calculating basic and diluted net loss per share (in shares)	73,989	66,113	71,986	64,489

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]	'		'		'		'
Net loss	($7,284)		($71,562)		($28,810)		($116,509)
Other comprehensive loss, net of tax:	'		'		'		'
Unrealized gain (loss) on investments	-179	[1]	-659	[1]	-5,404	[1]	196	[1]
Loss on foreign currency translation	-37		-127		-377		-249
Other comprehensive loss, net of tax	-216		-786		-5,781		-53
Total comprehensive loss	-7,500		-72,348		-34,591		-116,562
Reclassification adjustment from AOCI to earnings, short term investments	($6)		($207)		($3,290)		($1,401)
[1]	The amounts reclassified from accumulated other comprehensive loss and recorded in interest income (expense), net in the Condensed Consolidated Statement of Operations relating to short term investments were zero and $3.3 million for the three and nine months ended December 31, 2013, respectively, and $0.2 million and $1.4 million for the three and nine months ended December 31, 2012, respectively. Refer to Note 2, Certain Financial Statement Information, to the Condensed Consolidated Financial Statements for additional details.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Operating activities:	'		'
Net loss	($28,810)		($116,509)
Adjustments to reconcile net loss to net cash used for operating activities:	'		'
Depreciation	7,728		7,247
Amortization of purchased intangibles	420		3,626
Stock-based compensation expense:	'		'
Stock options	1,985		3,024
Restricted stock units	11,445		18,521
Warrants	0		1,289
Veloce accrued liability	42,684		56,580
Acquisition related adjustment	0		-133
Gain on sale of TPack	-19,699		0
Net loss (gain) on disposals of property, equipment and other assets	27		-1,296
Non-cash restructuring costs	298		4,689
Tax effect on other comprehensive income	0		-130
Changes in operating assets and liabilities:	'		'
Accounts receivable	-4,459		5,304
Inventories	2,415		9,387
Assets held for sale	-14,260		0
Other assets	16,475		-2,758
Accounts payable	-4,423		-3,907
Accrued payroll and other accrued liabilities	610		887
Veloce accrued liability	-45,432		-15,928
Deferred revenue	-449		-841
Net cash used for operating activities	-33,445		-30,948
Investing activities:	'		'
Proceeds from sales and maturities of short-term investments	26,594		35,367
Purchases of short-term investments	-16,241		-17,834
Proceeds from sale of property, equipment and other assets	20		1,800
Purchase of property, equipment and other assets	-5,616		-8,454
Proceeds from sale of strategic equity investment	1,286		7,146
Purchases of strategic equity investment	0		-500
Proceeds from the sale of TPack, net	-29,498		0
Funding of a note receivable	0		-500
Net cash provided by investing activities	35,541		17,025
Financing activities:	'		'
Proceeds from issuance of common stock	8,582		5,841
Funding of restricted stock units withheld for taxes	-5,518		-2,773
Repurchase of common stock	0		-653
Payment of contingent consideration	0		-485
Other	-595		-389
Net cash provided by financing activities	2,469		1,541
Net increase (decrease) in cash and cash equivalents	4,565		-12,382
Cash and cash equivalents at beginning of year	19,065	[1]	28,065
Cash and cash equivalents at end of period	23,630		15,683
Supplementary cash flow disclosures:	'		'
Cash paid for income taxes	609		662
Common stock issued for Veloce merger consideration	$29,209		$15,956
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	The Condensed Consolidated Financial Statements include all the accounts of AppliedMicro (the "Company") and its wholly-owned subsidiaries including Veloce Technologies Inc. (“Veloce”), which was consolidated in prior accounting periods prior to its merger with the Company, as a variable interest entity (“VIE”) since the Company was determined to be its primary beneficiary. On June 20, 2012, the Company completed the acquisition of Veloce which became a wholly owned subsidiary of the Company as of this date. See Note 4, Veloce, to the Condensed Consolidated Financial Statements. All significant intercompany balances and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of net revenue and expenses in the reporting period. The Company regularly evaluates estimates and assumptions related to its:
	•	capitalized mask sets including their useful lives, which affect cost of goods sold and property and equipment or Research and Development ("R&D") expenses, if not capitalized;
	•	inventory valuation, warranty liabilities and revenue reserves, which affects cost of sales, gross margin, and revenues;
	•	allowance for doubtful accounts, which affects operating expenses;
	•	unrealized losses or other-than-temporary impairments of short-term investments available for sale, which affects interest income (expense), net;
	•	valuation of purchased intangibles and goodwill, which affects amortization and impairments of purchased intangibles, impairments of goodwill and apportionment of goodwill related to divestitures;
	•	Veloce accrued liability which considers: (i) estimating the total value of the expected Veloce consideration, (ii) determining the stage at which a milestone is deemed to be probable of attainment, (iii) the estimated progress towards achieving the milestone at the time such milestone was deemed probable of achievement and (iv) estimating the approximate timing of the expected completion of the milestones and related payments;
	•	potential costs of litigation, which affects operating expenses;
	•	valuation of deferred income taxes, which affects income tax expense (benefit); and
	•	stock-based compensation, which affects gross margin and operating expenses.
	The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The actual results experienced by the Company may differ materially and adversely from management’s estimates. To the extent there are material differences between the estimates and the actual results, future results of operations will be affected.
	Recently Adopted Accounting Pronouncements
	In July 2013, the FASB issued Accounting Standards Update 2013-11 amending Income Taxes: Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists that will require the presentation of certain unrecognized tax benefits as reductions to deferred tax assets rather than as liabilities in the condensed consolidated balance sheets when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The amendments will be effective for interim and annual periods beginning after December 15, 2013; however, early adoption and retrospective application are permitted. The Company does not expect the adoption of these amendments to have a significant impact on the Company’s Consolidated Financial Statements.

Certain_Financial_Statement_In

Certain Financial Statement Information	9 Months Ended
	Dec. 31, 2013
Certain Financial Statement Information [Abstract]	'
CERTAIN FINANCIAL STATEMENT INFORMATION	'
	CERTAIN FINANCIAL STATEMENT INFORMATION
	Accounts receivable:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Accounts receivable		$	29,281			$	25,278
	Less: allowance for bad debts		(481		)		(703		)
			$	28,800			$	24,575
	Inventories:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Finished goods		$	4,513			$	7,247
	Work in process		4,637				4,098
	Raw materials		1,332				1,555
			$	10,482			$	12,900
	Assets held for sale:
		December 31,				March 31,
		2013				2013
		(In thousands)
	Assets held for sale	$	14,260			$	—
	As of December 31, 2013, the Company classified its headquarters building in Sunnyvale, California as assets held for sale in the Condensed Consolidated Balance Sheets at $14.3 million representing the carrying amount of the asset. In January 2014, the Company agreed to sell the headquarters building for a purchase price of $40.8 million in cash, subject to a limited set of certain closing conditions. See Note 9, Subsequent Events, to the Condensed Consolidated Financial Statements for details.
	Other current assets:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Prepaid expenses		$	11,177			$	13,762
	Executive deferred compensation assets		1,157				693
	Deposits		653				828
	Receivable from sale of strategic investment and TPack		3,353				1,331
	Other		1,489				1,384
			$	17,829			$	17,998
	Property and equipment:
			Useful		December 31,				March 31,
			Life		2013				2013
			(In years)		(In thousands)
	Machinery and equipment *		7-May		$	44,887			$	40,063
	Leasehold improvements **		15-Jan		9,011				14,202
	Computers, office furniture and equipment		7-Mar		43,992				43,485
	Buildings **		31.5		—				2,756
	Land **		—		—				9,800
					97,890				110,306
	Less: accumulated depreciation and amortization				(77,718		)		(75,915		)
					$	20,172			$	34,391
	* Includes capitalized mask costs.
	** December 31, 2013 balances exclude $14.3 million, including land, building and leasehold improvements related to the Company's headquarters in Sunnyvale, California, which have been reclassified as assets held for sale and included under current assets.
	Goodwill and purchased intangibles:
	Goodwill is as follows:
		December 31,				March 31,
		2013				2013
		(In thousands)
	Goodwill	$	11,425			$	13,183
	The reduction in goodwill of $1.8 million relates to the sale of TPack. See Note 8, Sale of TPack A/S, to the Condensed Consolidated Financial Statements for details.
	Purchase-related intangibles are as follows:
			31-Dec-13															31-Mar-13
			Gross				Accumulated				Net				Weighted			Gross			Accumulated				Net				Weighted
							Amortization								average						Amortization								average
							and Impairments								remaining						and Impairments								remaining
															useful life														useful life
			(In thousands)												(In years)			(In thousands)											(In years)
	Developed technology/in-process research and development		$	425,000			$	(425,000	)		$	—			—			$	441,300		$	(431,771	)		$	9,529			3.5
	Customer relationships		6,330				(6,163		)		167				0.7			12,830			(10,507		)		2,323				2.1
	Patents/core technology rights/tradename		62,306				(62,306		)		—				—			63,206			(63,067		)		139				0.3
		$	493,636			$	(493,469	)		$	167						$	517,336		$	(505,345	)		$	11,991
During the quarter ended June 30, 2013, $11.4 million of purchased intangibles were written off pursuant to the sale of TPack. Please refer to Note 8, Sale of TPack A/S, to the Condensed Consolidated Financial Statements for further discussion.
As of December 31, 2013, the estimated future amortization expense of purchased intangible assets to be charged to operating expenses was as follows (in thousands):
		Operating
		Expenses
Fiscal Years Ending March 31,
2014 (remainder of year)		$	63
2015		104
Total		$	167
Other assets:
		December 31,				March 31,
		2013				2013
		(In thousands)
Non-current portion of prepaid expenses		$	4,842			$	7,866
Strategic investments		3,000				3,000
		$	7,842			$	10,866
Other accrued liabilities:
		December 31,				March 31,
		2013				2013
		(In thousands)
Employee related liabilities		$	1,902			$	2,236
Executive deferred compensation		1,415				1,284
Income taxes		1,254				903
Professional fees		2,033				3,840
Other		4,574				2,467
		$	11,178			$	10,730
Strategic Investments
The Company has entered into certain equity investments in privately held businesses to achieve certain strategic business objectives. The Company’s investments in equity securities of privately held businesses are accounted for under the cost method. Under the cost method, strategic investments in which the Company holds less than a 20% voting interest and in which the Company does not have the ability to exercise significant influence are carried at cost reduced by other-than-temporary impairments, as appropriate. These investments are included in other assets on the Company’s Condensed Consolidated Balance Sheets. The Company periodically reviews these investments for other-than-temporary declines in fair value based on the specific identification method and writes down investments when an other-than-temporary decline has occurred. During the nine months ended December 31, 2013 and 2012, the Company did not record any other-than-temporary impairment charges of its strategic investments and invested zero and $0.5 million, respectively, in non-marketable equity investments and these amounts are carried at adjusted cost.
Short-term investments:
The following is a summary of cash, cash equivalents and available-for-sale investments by type of instrument (in thousands):
		31-Dec-13																31-Mar-13
		Amortized				Gross Unrealized								Estimated				Amortized			Gross Unrealized								Estimated
		Cost				Gains				Losses				Fair Value				Cost			Gains				Losses				Fair Value
Cash		$	19,716			$	—			$	—			$	19,716			$	8,529		$	—			$	—			$	8,529
Cash equivalents		3,914				—				—				3,914				10,536			—				—				10,536
U.S. Treasury securities and agency bonds		11,747				8				(4		)		11,751				12,363			10				—				12,373
Corporate bonds		15,482				56				(4		)		15,534				15,567			63				(2		)		15,628
Mortgage-backed and asset-backed securities*		4,015				300				(47		)		4,268				3,655			355				(7		)		4,003
Closed-end bond funds		14,374				2,261				(818		)		15,817				21,914			5,340				(39		)		27,215
Preferred stock		2,406				878				—				3,284				4,878			2,314				—				7,192
		$	71,654			$	3,503			$	(873	)		$	74,284			$	77,442		$	8,082			$	(48	)		$	85,476
Reported as:
Cash and cash equivalents														$	23,630														$	19,065
Short-term investments available-for-sale														50,654															66,411
														$	74,284														$	85,476
* At December 31, 2013 and March 31, 2013, approximately $1.1 million and $1.4 million of the estimated fair value presented were mortgage-backed securities, respectively.
The established guidelines for measuring fair value and expanded disclosures regarding fair value measurements are defined as a three-level valuation hierarchy for disclosure of fair value measurements as follows:
Level 1 — Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.
Level 2 — Inputs (other than quoted market prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.
Level 3 — Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. Valuation of instruments includes unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of assets or liabilities.
The following is a summary of cash, cash equivalents and available-for-sale investments by type of instrument measured at fair value on a recurring basis (in thousands):
		31-Dec-13																31-Mar-13
		Level 1				Level 2				Level 3				Total				Level 1			Level 2				Level 3				Total
Cash		$	19,716			$	—			$	—			$	19,716			$	8,529		$	—			$	—			$	8,529
Cash equivalents		3,914				—				—				3,914				9,508			1,028				—				10,536
U.S. Treasury securities and agency bonds		11,596				155				—				11,751				12,373			—				—				12,373
Corporate bonds		—				15,534				—				15,534				—			15,628				—				15,628
Mortgage-backed and asset-backed securities		—				4,268				—				4,268				—			4,003				—				4,003
Closed-end bond funds		15,817				—				—				15,817				27,215			—				—				27,215
Preferred stock		—				3,284				—				3,284				—			7,192				—				7,192
		$	51,043			$	23,241			$	—			$	74,284			$	57,625		$	27,851			$	—			$	85,476
There were no significant transfers in and out of Level 1 and Level 2 fair value measurement categories during the three and nine months ended December 31, 2013 and 2012.
The following is a summary of the cost and estimated fair values of available-for-sale securities with stated maturities, which include U.S. Treasury securities and agency bonds, corporate bonds and mortgage-backed and asset-backed securities, by contractual maturity (in thousands):
		31-Dec-13								31-Mar-13
		Cost				Estimated Fair Value				Cost				Estimated Fair Value
Less than 1 year		$	7,259			$	7,411			$	9,205			$	9,217
Mature in 1 – 2 years		22,341				22,369				19,843				20,040
Mature in 3 – 5 years		707				771				1,575				1,649
Mature after 5 years		937				1,002				962				1,098
		$	31,244			$	31,553			$	31,585			$	32,004
The following is a summary of gross unrealized losses as of (in thousands):
		Less Than 12 Months of								12 Months or More of								Total
		Unrealized Losses								Unrealized Losses
As of December 31, 2013		Estimated				Gross				Estimated				Gross				Estimated			Gross
		Fair				Unrealized				Fair				Unrealized				Fair			Unrealized
		Value				Losses				Value				Losses				Value			Losses
U.S. Treasury securities and agency bonds		$	2,566			$	(4	)		$	—			$	—			$	2,566		$	(4	)
Corporate bonds		2,811				(4		)		—				—				2,811			(4		)
Mortgage-backed and asset-backed securities		1,451				(47		)		6				—				1,457			(47		)
Closed-end bond funds		6,344				(721		)		377				(97		)		6,721			(818		)
		$	13,172			$	(776	)		$	383			$	(97	)		$	13,555		$	(873	)
		Less Than 12 Months of								12 Months or More of								Total
		Unrealized Losses								Unrealized Losses
As of March 31, 2013		Estimated				Gross				Estimated				Gross				Estimated			Gross
		Fair				Unrealized				Fair				Unrealized				Fair			Unrealized
		Value				Losses				Value				Losses				Value			Losses
U.S. Treasury securities and agency bonds		$	300			$	—			$	—			$	—			$	300		$	—
Corporate bonds		2,276				(2		)		113				—				2,389			(2		)
Mortgage-backed and asset-backed securities		647				(3		)		—				(4		)		647			(7		)
Closed-end bond funds		—				—				6,991				(39		)		6,991			(39		)
		$	3,223			$	(5	)		$	7,104			$	(43	)		$	10,327		$	(48	)
Other-Than-Temporary Impairment
Based on an evaluation of securities that have been in a loss position, the Company did not recognize any other-than-temporary impairment charges for the three and nine months ended December 31, 2013 and 2012. The Company considered various factors which included a credit and liquidity assessment of the underlying securities and the Company’s intent and ability to hold the underlying securities until the estimated date of recovery of its amortized cost. As of December 31, 2013 and March 31, 2013, the Company also had $3.5 million and $8.1 million in gross unrealized gains, respectively. The basis for computing realized gains or losses is by specific identification.
Warranty reserves:
The Company's products typically carry a one year warranty. The Company establishes reserves for estimated product warranty costs at the time revenue is recognized. Although the Company engages in extensive product quality programs and processes, its warranty obligation is affected by product failure rates, use of materials and service delivery costs incurred in correcting any product failure. Should actual product failure rates, use of materials or service delivery costs differ from the Company's estimates, additional warranty reserves could be required which could reduce its gross margin.
The following table summarizes warranty reserve activity (in thousands):
	Three Months Ended								Nine Months Ended
	December 31,								December 31,
	2013				2012				2013				2012
Beginning balance	$	187			$	370			$	220			$	454
Charged to costs of revenues	54				96				28				311
Cost incurred	(39		)		(108		)		(46		)		(407		)
Ending balance	$	202			$	358			$	202			$	358
Interest income (expense), net (in thousands):
		Three Months Ended								Nine Months Ended
		December 31,								December 31,
		2013				2012				2013				2012
Interest income		$	519			$	685			$	1,389			$	1,915
Net realized gain on short-term investments		6				207				3,290				1,401
		$	525			$	892			$	4,679			$	3,316
Net loss per share:
Shares used in basic net loss per share are computed using the weighted average number of common shares outstanding during each period. Shares used in diluted net loss per share include the dilutive effect of common shares potentially issuable upon the exercise of stock options, vesting of RSUs and outstanding warrants. The reconciliation of shares used to calculate basic and diluted net loss per share consists of the following (in thousands, except per share data):
		Three Months Ended								Nine Months Ended
		December 31,								December 31,
		2013				2012				2013				2012
Net loss		$	(7,284	)		$	(71,562	)		$	(28,810	)		$	(116,509	)
Shares used in net loss per share computation:
Weighted average common shares outstanding, basic		73,989				66,113				71,986				64,489
Net effect of dilutive common share equivalents		—				—				—				—
Weighted average common shares outstanding, diluted		73,989				66,113				71,986				64,489
Basic and diluted net loss per share		$	(0.10	)		$	(1.08	)		$	(0.40	)		$	(1.81	)
The effect of anti-dilutive securities (comprised of options and restricted stock units) totaling 3.8 million and 4.7 million equivalent shares for the three and nine months ended December 31, 2013, respectively, and 5.4 million and 8.7 million equivalent shares for the three and nine months ended December 31, 2012, respectively, have been excluded from the net loss per share computation, as their impact would be anti-dilutive.
The effect of dilutive securities (comprised of options and restricted stock units) totaling 1.8 million and 1.4 million shares for the three and nine months ended December 31, 2013, respectively, and 1.4 million and 0.7 million shares for the three and nine months ended December 31, 2012, respectively, have been excluded from the net loss per share computation, as their impact would be anti-dilutive because the Company incurred net losses in the periods presented.
Total equivalent shares excluded from the net loss per share computation are 5.6 million and 6.1 million for the three and nine months ended December 31, 2013, respectively, and 6.8 million and 9.4 million for the three and nine months ended December 31, 2012, respectively.

Restructuring_Charges

Restructuring Charges	9 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
RESTRUCTURING CHARGES	'
	RESTRUCTURING CHARGES
	The Company recognizes restructuring costs related to asset impairment and exit or disposal activities. Costs relating to facilities closure or lease commitments are recognized when the facility has been exited. Termination costs are recognized when the costs are deemed both probable and estimable.
	December 2012 Restructuring Program
	In December 2012, the Company implemented a restructuring program to reorganize its operations and reduced its workforce by approximately 70 employees. The plan included eliminating job redundancies, reducing the Company's workforce and impairing the unamortized value of a software intellectual property license, which the Company does not intend to use to develop new products. As of December 31, 2013, the actual annual savings were within the range of originally expected savings of $8.0 million to $9.0 million for headcount expenses and $4.0 million to $5.0 million for other additional operational expenses. Total costs incurred and expected to be incurred as of December 31, 2013 in connection with the restructuring plan are $1.8 million.
	August 2013 Restructuring Program
	In August 2013, the Company implemented a restructuring program to reorganize its operations and reduced its workforce by approximately 20 employees. The plan included eliminating job redundancies, reducing the Company's workforce and impairing the unamortized value of a software intellectual property license, which the Company no longer intends to use to develop new products. The Company anticipates that the restructuring plan will reduce ongoing headcount expenses by approximately $3.0 million annually and other additional operational expenses by $0.5 million annually. Total costs incurred and expected to be incurred as of December 31, 2013 in connection with the restructuring plan are $1.0 million.
	The restructuring activity during the three and nine months ended December 31, 2013 relating to the December 2012 and August 2013 restructuring programs is as follows (in thousands):
		Workforce Reduction			Asset Impairment			Total
	Liability, March 31, 2013	$	548		$	—		$	548
	Restructuring charges	93			—			$	93
	Cash payments	(334		)	—			$	(334	)
	Liability, June 30, 2013	307			—			307
	Restructuring charges	727			272			999
	Non-cash items	—			(272		)	(272		)
	Cash payments	(847		)	—			(847		)
	Liability, September 30, 2013	$	187		$	—		$	187
	Restructuring charges	38			—			38
	Cash payments	(225		)	—			(225		)
	Liability, December 31, 2013	—			—			—

Veloce

Veloce	9 Months Ended
	Dec. 31, 2013
Variable Interest Entity, Measure of Activity [Abstract]	'
VELOCE	'
	VELOCE
	On June 20, 2012 (the “Closing Date”), the Company completed its acquisition of Veloce pursuant to the terms of the Agreement and Plan of Merger (the “Merger Agreement”). Veloce has been developing specific technology for the Company.
	The terms of the Merger Agreement include the payment of the total consideration, payable to holders of Veloce common stock options that were vested on the Closing Date and holders of Veloce common stock and stock equivalents (collectively “Veloce Equity Holders”), and to Veloce stock equivalents that have not yet been allocated to individuals (“Unallocated Veloce Units”). The Merger Agreement further provides for payments of additional merger consideration contingent upon the achievement of certain post-closing product development milestones relating to the Veloce development project.
	The total estimated consideration to be paid is based upon the benchmarks achieved during simulations that were performed during the third quarter of fiscal 2013 and correlation of the results of the simulations to the contractual terms included in the Merger Agreement. As a result of higher than expected benchmarks achieved during simulations, the total estimated consideration to be paid was updated during fiscal 2013 from a previous estimated maximum of approximately $135.0 million to the contractual maximum of $178.5 million. Significant judgment is required in assessing when a performance milestone is probable of achievement and estimating the percentage of completion of the milestone and the timing of when the performance milestones will be completed. These determinations are based on discussions with internal technical personnel that address various qualitative and quantitative factors, including, but not limited to, overall complexity associated with the assessment, stage of development, progress made to date, results of testing and consideration as to the nature of the remaining development work.
	The Company has completed the first and second performance milestones and assessed the third and final performance milestone relating to the Veloce project as probable of achievement as of December 31, 2013. As of December 31, 2013, the Company assessed that all the effort required for the third milestone had been completed. The consideration relating to the three performance milestones, excluding the value allocated to the Unallocated Veloce Units, in the amount of $169.3 million, has been recognized as research and development expense through December 31, 2013 compared to $117.0 million as of December 31, 2012. During the three and nine months ended December 31, 2013, as part of the above arrangement, the Company paid approximately $1.2 million and $45.4 million, respectively, in cash and issued approximately 25,000 shares and 3.8 million shares, respectively, valued at approximately $0.2 million and $29.2 million, respectively. During the three and nine months ended December 31, 2012, as part of the above arrangement, the Company paid approximately $1.1 million and $15.9 million, respectively, in cash and issued approximately 0.2 million shares and 2.8 million shares, respectively, valued at approximately $1.1 million and $15.9 million, respectively.
	The consideration that the Company will be obligated to pay will be allocated equally to each of the Veloce Equity Holders and the Unallocated Veloce Units. The Company is contractually required to distribute all Unallocated Veloce Units within a certain time period. During the three and nine months ended December 31, 2013, the Company distributed an additional 1,400 and 0.5 million Unallocated Veloce Units which had a related expense of $20,000 and $5.9 million, respectively. Veloce Equity Holders subject to vesting requirements will receive their distribution upon satisfaction of such vesting requirements.
	For accounting purposes, the costs incurred in connection with the development milestones relating to Veloce are considered compensatory and are recognized as R&D expense. Recognition of these costs as expense occurred when certain development and performance milestones became probable of achievement and were deemed earned. However, the value allocated to the Unallocated Veloce Units will not be recognized as R&D expense until distribution of the underlying units occurs. As of December 31, 2013, 0.9 million Unallocated Veloce Units had not been allocated, and the maximum potential additional expense to be recognized associated with these Unallocated Veloce Units is approximately $9.2 million.
	Total R&D expenses recognized related to Veloce were approximately $2.9 million and $42.7 million during the three and nine months ended December 31, 2013, respectively, and approximately $51.9 million and $56.6 million during the three and nine months ended December 31, 2012, respectively. The Veloce accrued liability included on the Condensed Consolidated Balance Sheets is based upon the amount of R&D expense recognized in connection with the development of the Veloce performance milestones less amounts paid either in cash or our common stock. Veloce consideration that has been accrued as of December 31, 2013 is classified as long-term if payments of the consideration are expected to occur beyond a 12 month period.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
STOCKHOLDERS' EQUITY	'
	STOCKHOLDERS’ EQUITY
	Preferred Stock
	The Certificate of Incorporation allows for the issuance of up to two million shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof, including dividend rights, dividend rates, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences, and the number of shares constituting any series of the designation of such series, without further vote or action by the stockholders. At December 31, 2013, there are no preferred shares outstanding.
	Common Stock
	At December 31, 2013, the Company had 375.0 million shares authorized for issuance and approximately 74.2 million shares issued and outstanding. At March 31, 2013, there were approximately 68.0 million shares issued and outstanding.
	Employee Stock Purchase Plan ("ESPP")
	Under the Company's 1998 Employee Stock Purchase Plan ("1998 Plan"), the Company had 6.3 million shares reserved for issuance. In August 2012, the Company’s stockholders approved the proposal to reserve an additional 1.8 million shares under the 2012 Employee Stock Purchase Plan ("2012 Plan"). Upon adoption of the 2012 Plan, the 1998 Plan was terminated. Under the terms of the 2012 Plan, purchases are made semiannually and the purchase price of the common stock is equal to 85% of the fair market value of the common stock on the first or last day of the offering period, whichever is lower. During the nine months ended December 31, 2013 and 2012, 0.3 million and zero shares were issued under the 2012 plan, respectively. In addition, during the nine months ended December 31, 2012, 0.4 million shares were issued under the 1998 plan. At December 31, 2013, 0.8 million shares were available for future issuance from the 2012 Plan.
	Stock Repurchase Program
	In August 2004, the Board of Directors authorized a stock repurchase program for the repurchase of up to $200.0 million of the Company's common stock. Under the program, the Company is authorized to make purchases in the open market or enter into structured agreements. In October 2008, the Board of Directors increased the stock repurchase program by $100.0 million. There were no stock repurchases during the nine months ended December 31, 2013. During the nine months ended December 31, 2012, approximately 0.1 million shares were repurchased on the open market at a weighted average price of $5.18 per share. From the time the program was first implemented in August 2004, the Company has repurchased on the open market a total of 17.3 million shares at a weighted average price of $10.04 per share. All repurchased shares were retired upon delivery to the Company. As of December 31, 2013, the Company had $15.9 million available in its stock repurchase program.
	Stock Options
	The Company has granted stock options to employees and non-employee directors under several plans. These option plans include three stockholder-approved plans (1992 Stock Option Plan, 1997 Directors’ Stock Option Plan and 2011 Equity Incentive Plan) and four plans not approved by stockholders (2000 Equity Incentive Plan, Cimaron Communications Corporation’s 1998 Stock Incentive Plan assumed in the fiscal 1999 merger, and JNI Corporation’s 1997 and 1999 Stock Option Plans assumed in the fiscal 2004 merger). Certain other outstanding options were assumed through the Company’s various acquisitions.
	Option activity under the Company’s stock incentive plans during the nine months ended December 31, 2013 is set forth below (in thousands, except per share data):
			Number of Shares		Weighted Average
					Exercise Price
					Per Share
	Outstanding at the beginning of the year		3,492		$	10.26
	Granted		40		7.35
	Exercised		(641	)	9.5
	Cancelled		(420	)	11.36
	Outstanding at the end of the period		2,471		$	10.22
	Vested and expected to vest at the end of the period		2,470		$	10.22
	Vested and exercisable at the end of the period		2,344		$	10.31
	At December 31, 2013, the weighted average remaining contractual term for options outstanding and vested is 2.8 years.
	The aggregate pretax intrinsic value of options exercised during the nine months ended December 31, 2013 was approximately $1.7 million. This intrinsic value represents the excess of the fair market value of the Company’s common stock on the date of exercise over the exercise price of such options.
	The weighted average remaining contractual life and weighted average per share exercise price of options outstanding and of options exercisable as of December 31, 2013 were as follows (in thousands, except exercise prices and years):
			Options Outstanding						Options Exercisable
	Range of Exercise Prices		Number of		Weighted		Weighted		Number of	Weighted
			Shares		Average		Average		Shares	Average
					Remaining		Exercise Price			Exercise Price
					Contractual
					Life
	$  1.68 - $ 7.60		562		3.28		$	6.71	473	$	6.63
	7.61 - 7.67		650		2.58		7.67		650	7.67
	7.68 - 11.86		430		3.55		10.49		406	10.42
	11.87 - 14.20		493		2.61		12.87		478	12.89
	14.21 - 23.32		336		1.55		16.78		337	16.78
	$  1.68 - $23.32		2,471		2.77		$	10.22	2,344	$	10.31
	As of December 31, 2013, the aggregate pre-tax intrinsic value of options outstanding and exercisable was approximately $9.0 million and $8.4 million, respectively. The aggregate pre-tax intrinsic values were calculated based on the closing price of the Company’s common stock of $13.37 on December 31, 2013.
	Restricted Stock Units ("RSUs")
	The Company has granted RSUs pursuant to its 1992 Plan, 2000 Equity Incentive Plan and 2011 Equity Incentive Plan as part of its regular annual employee equity compensation review program as well as to new hires. RSUs are share awards that, upon vesting, will deliver to the holder shares of the Company’s common stock. Generally, RSUs vest ratably on a quarterly basis over four years from the date of grant. For employees hired after May 15, 2006, RSUs will vest on a quarterly basis over four years from the date of hire provided that no shares will vest during the first year of employment, at the end of which the shares that would have vested during that year will vest and the remaining shares will vest over the remaining 12 quarters.
	In April 2011, the Committee authorized three-year performance-based RSU grants, or “EBITDA2” Grants. Fiscal 2012 and 2013 were declared as zero attainment years and vesting target shares have rolled over to fiscal 2014. The Company expects that all shares issued under the EBITDA2 program will expire unvested when the program concludes in May 2014.
	In November 2011 and February 2012, the Committee authorized additional 18-month performance-based RSU grants, or “Performance Retention" Grants, which were intended to incentivize superior performance and retain key employees. In May 2012, the Committee authorized 12-month Performance Retention Grants. Vesting for the Performance Retention Grants was subject to (i) the accomplishment of goals and objectives of the individual’s business unit and (ii) individual performance as measured by the accomplishment of individual goals and objectives. The 18-month RSU shares generally vested 2/3 after one year, with certain unearned amounts able to roll over to the subsequent vesting period, and 1/3 after 18 months. The 12-month RSU shares had the opportunity to vest after 1 year. Unvested RSU shares remaining at the end of the program period expired unvested. This program has concluded and no further grants will be made under this program.
	In February 2012, Dr. Gopi was awarded 500,000 performance-based RSUs based on three underlying performance milestones. The value of these RSUs is $3.7 million. The award associated with each underlying milestone will vest only if the Company's performance milestones relating to the Veloce merger are satisfied; otherwise they will expire unvested. The Company evaluates the probability of achieving the milestones and recognizes expense accordingly. As of December 31, 2013, the first two performance milestones have been completed and the third and final performance milestone was assessed as being probable of attainment, and the associated stock-based compensation expense has been recorded in the Company's Condensed Consolidated Financial Statements. In November 2013, Dr. Gopi was awarded an additional 500,000 RSUs of which 200,000 RSUs were vested on the grant date and the remaining 300,000 RSUs will vest upon the attainment of certain specified X-Gene and X-Weave commercialization goals. The value of these performance-based RSUs is $3.2 million.
	In May and November 2013, the Committee authorized performance-based market stock units or "MSUs". The MSUs will be earned, if at all, based on the Company's Total Shareholder Return (“TSR”) compared to that of the SPDR S&P Semiconductor Index ("Index”) over a two-year performance period (for half of the MSU award) and a three-year performance period (for the remaining half of the MSU award). The MSUs will vest between ranges of 0% and 150% based on the Company's relative TSR compared to the Index.
	In May 2013, the Committee authorized an annual incentive compensation plan the (“FY2014 Short Term Plan”), that, if earned, would become payable in RSUs on May 15, 2014. The FY 2014 Short Term Plan will pay out based on fiscal 2014 revenue and non-GAAP earnings per share metrics. The award payouts for each corporate financial measure will range from 50% to 150% of the pre-established target level based on the Company's actual performance for fiscal 2014.
	Restricted stock unit activity during the nine months ended December 31, 2013 is set forth below (in thousands):
		Number of Shares
	Outstanding at the beginning of the year	6,444
	Awarded	3,069
	Vested	(2,048	)
	Cancelled	(1,510	)
	Outstanding at the end of the period	5,955
	The weighted average remaining contractual term for the restricted stock units outstanding as of December 31, 2013 was 1.0 year.
	As of December 31, 2013, the aggregate pre-tax intrinsic value of restricted stock units outstanding was $79.6 million which includes performance-based awards which are subject to milestone attainment. The aggregate pretax intrinsic values were calculated based on the closing price of the Company’s common stock of $13.37 on December 31, 2013.
	The aggregate pretax intrinsic value of RSUs released during the nine months ended December 31, 2013 was $18.8 million. This intrinsic value represents the fair market value of the Company’s common stock on the date of release.
	Warrants
	On May 17, 2009, the Company entered into a development agreement with Veloce pursuant to which Veloce agreed, among other things, to perform development work for the Company on an exclusive basis for up to five years for cash and other consideration, including a warrant to purchase shares of the Company’s common stock (the “Warrant”). In connection with the Merger Agreement amendment entered into on April 5, 2012, the Company and Veloce further modified the Warrant by fully accelerating the vesting schedule resulting in the recognition of approximately $1.3 million of stock compensation expense during the quarter ended June 30, 2012.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
STOCK-BASED COMPENSATION	'
	STOCK-BASED COMPENSATION
	The Company accounts for stock-based compensation activity using the modified prospective method. This method requires companies to estimate the fair value of stock-based compensation on the date of grant using an option-pricing model. The Company uses the Black-Scholes model to value stock-based compensation for options and ESPP, and the fair market value of the Company's common stock for RSUs. The MSUs were valued using the Monte Carlo pricing model, which uses the Company's stock price, the Index value, expected volatilities of the Company's stock price and the Index, correlation coefficients and risk free interest rates to determine the fair value. The Black-Scholes model determines the fair value of share-based payment awards based on the stock price on the date of grant and is affected by assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, the Company’s stock price, volatility over the term of the awards and actual and projected employee stock option exercise behaviors. Option-pricing models were developed for use in estimating the value of traded options that have no vesting or hedging restrictions and are fully transferable. Although the fair value of stock options granted by the Company is estimated by the Black-Scholes model, the estimated fair value may not be indicative of the fair value observed in a willing buyer/willing seller market transaction.
	The Company did not grant options or employee stock purchase rights during the three months ended December 31, 2013 and 2012. The fair value of the options and employee stock purchase rights granted during the nine months ended December 31, 2013 and 2012 is estimated as of the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:
		Nine Months Ended December 31,
		Employee Stock						ESPP
		Options
		2013			2012			2013			2012
	Expected life (years)	4.4			4.5			0.5			0.5
	Risk-free interest rate	0.6		%	0.7		%	0.1		%	0.2		%
	Volatility	49		%	54		%	57		%	50		%
	Dividend yield	—		%	—		%	—		%	—		%
	Weighted average fair value	$	2.95		$	2.47		$	3.67		$	1.5
	The weighted average grant-date fair value per share of the restricted stock units awarded was $9.84 and $8.57 during the three and nine months ended December 31, 2013, respectively, compared to $6.13 and $5.71 during the three and nine months ended December 31, 2012, respectively. The weighted average fair value per share was calculated based on the fair market value of the Company’s common stock on the respective grant dates.
	Effective April 1, 2013, the Company revised its estimated forfeiture rate used in determining the amount of stock-based compensation from 6.6% to 6.7% as a result of an increased rate of forfeitures in recent periods, which the Company believes is indicative of the rate it will experience during the remaining vesting period of currently outstanding unvested grants.
	The following table summarizes stock-based compensation expense related to stock options and RSUs (in thousands):
		Three Months Ended						Nine Months Ended
		December 31,						December 31,
		2013			2012			2013			2012
	Stock-based compensation expense by type of award
	Stock options	$	648		$	935		$	1,987		$	3,024
	Restricted stock units	5,231			5,276			11,454			18,427
	Total stock-based compensation	5,879			6,211			13,441			21,451
	Stock-based compensation (capitalized to) expensed from inventory	3			11			(11		)	94
	Total stock-based compensation expense	$	5,882		$	6,222		$	13,430		$	21,545
	The following table summarizes stock-based compensation expense as it relates to the Company’s Condensed Consolidated Statement of Operations (in thousands):
		Three Months Ended						Nine Months Ended
		December 31,						December 31,
		2013			2012			2013			2012
	Stock-based compensation expense by cost centers
	Cost of revenues	$	118		$	147		$	353		$	502
	Research and development	1,545			2,814			4,867			10,733
	Selling, general and administrative	4,216			3,250			8,221			10,216
	Total stock-based compensation	$	5,879		$	6,211		$	13,441		$	21,451
	Stock-based compensation (capitalized to) expensed from inventory	3			11			(11		)	94
	Total stock-based compensation expense	$	5,882		$	6,222		$	13,430		$	21,545
	The amount of unrecognized stock-based compensation cost estimated to be expensed from December 31, 2013 through fiscal 2018, including time and performance based awards that are expected to vest, is $21.7 million which will be recognized over a weighted-average period of 1.6 years. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned stock-based compensation expense. Future stock-based compensation expense and unearned stock-based compensation will increase to the extent that the Company grants additional equity awards or assumes unvested equity awards in connection with acquisitions.
	The stock based compensation expense of approximately $21.5 million for the nine months ended December 31, 2012 does not include approximately $1.3 million of expense related to the acceleration of Veloce warrants. See Note 4, Veloce, to the Condensed Consolidated Financial Statements for further details relating to the Veloce warrants.

Contingencies

Contingencies	9 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
CONTINGENCIES	'
	CONTINGENCIES
	Legal Proceedings
	The Company is currently a party to certain legal proceedings, including those noted in this section. While the Company presently believes that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm the Company's financial position, results of operations, cash flows, or overall trends, legal proceedings are subject to inherent uncertainties, unfavorable rulings or other events that could occur. In addition, legal proceedings are expensive to prosecute and defend against and can divert management attention and Company resources away from the Company's business objectives. Unfavorable resolutions could include monetary damages against the Company or injunctions or other restrictions on the conduct of the Company’s business, or preclude the Company from recovering the damages it seeks in legal proceedings it has commenced. It is also possible that the Company could conclude it is in the best interests of its stockholders, employees, and customers to settle one or more such matters, and any such settlement could include substantial payments or the surrender of rights to collect payments from third parties. However, the Company has not reached this conclusion with respect to any particular matter at this time.
	In 1993, the Company was named as a Potentially Responsible Party (“PRP”) along with more than 100 other companies that used an Omega Chemical Corporation waste treatment facility in Whittier, California (the “Omega Site”). The U.S. Environmental Protection Agency (“EPA”) has alleged that Omega failed to properly treat and dispose of certain hazardous waste materials at the Omega Site. The Company is a member of a large group of PRPs, known as the Omega Chemical Site PRP Organized Group (“OPOG”), that has agreed to fund certain on-going remediation efforts at the Omega Site. In February 2001, the U.S. District Court for the Central District of California (the “Court”) approved a consent decree between EPA and OPOG to study the contamination and evaluate cleanup options at the Omega Site (the Operable Unit 1 or “OU1”). In January 2009, the Court approved two amendments to the consent decree, the first expanding the scope of work to mitigate volatile organic compounds affecting indoor air quality near the Omega Site (the Operable Unit 3 or “OU3”) and the second adding settling parties to the consent decree. Removal of waste materials from the Omega Site has been completed. As part of OU1 and OU3, efforts to remediate the soil and groundwater at the Omega Site, as well as the extraction of chemical vapors from the soil and improving indoor air quality in and around the site, are underway and are expected to be ongoing for several years. In addition, OPOG and EPA are investigating a regional groundwater contamination plume allegedly originating at the Omega Site (the Operable Unit 2 or “OU2”). In September 2011, EPA issued an interim Record of Decision specifying the interim clean-up actions EPA has chosen for OU2, and in September 2012, it issued a special notice letter that triggered the commencement of good faith settlement negotiations with OPOG. In July 2013, EPA rejected a good faith offer (“GFO”) to settle the matter that OPOG had submitted in February 2013. In October 2013, OPOG submitted a revised GFO that EPA currently is considering. Settlement negotiations between the parties are expected to continue through fiscal year 2014. It is anticipated that such settlement negotiations will result in EPA and OPOG entering into a remediation consent decree with the Court regarding OU2. In December 2013, OPOG retained legal counsel to pursue claims against other PRPs for the regional groundwater contamination. In November 2007, Angeles Chemical Company, located downstream from the Omega Site, filed a lawsuit (the “Angeles Litigation”) in the Court against OPOG and the PRPs for cost recovery and indemnification for future response costs allegedly resulting from the regional groundwater contamination plume described above. In March 2008, the Court granted OPOG’s motion to stay the Angeles Litigation pending EPA’s determination of how to investigate and remediate the regional groundwater. In January 2012, as a result of challenges made by certain PRPs to the criteria previously used to allocate liability among OPOG members, and of the departure of certain PRPs from OPOG, OPOG approved changes to the cost allocation structure that resulted in an increase to the Company’s proportional allocation of liability. In addition, the subsequent departure of one or more other PRPs from OPOG could have the effect of increasing the proportional liability of the remaining PRPs, including the Company. Although the Company considers a loss relating to the Omega Site probable, its share of any financial obligations for the remediation of the Omega Site, including taking into account the allocation increases described above, is not currently believed to be material to the Company’s financial statements, based on the Company’s approximately 0.5% contribution to the total waste tonnage sent to the site and current estimates of the potential remediation costs. Based on currently available information, the Company has a loss accrual that is not material and believes that the actual amount of its costs will not be materially different from the amount accrued. However, proceedings are ongoing and the eventual outcome of the clean-up efforts and the pending litigation matters is uncertain at this time. Based on currently available information, the Company does not believe that any eventual outcome will have a material adverse effect on its operations.
	In August 2013, a complaint was filed against the Company in the California Superior Court for Santa Clara County by Emulex Corporation (“Emulex”), a purchaser of certain Company products, alleging rights to indemnification by the Company for unspecified expenses incurred by Emulex in connection with patent infringement litigation brought against Emulex by Broadcom Corporation in 2009 and 2010. In September 2013, the Company filed an answer which, among other things, denied each of the allegations in the complaint and filed a cross complaint against Emulex seeking, among other things, damages for fraudulent inducement and a declaratory judgment that the Company has no duty to indemnify Emulex in the Broadcom litigation. Discovery has recently commenced in these actions.

Sale_of_TPack_AS

Sale of TPack A/S	9 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
SALE OF TPACK A/S	'
	SALE OF TPack A/S
	On April 22, 2013, the Company completed the sale of TPack and certain specified intellectual property assets owned by the Company related to TPack's business for an aggregate consideration of $33.5 million, payable in cash, which reflects the $34.0 million base purchase price as adjusted for the working capital adjustment mechanism set forth in the Purchase Agreement, and remains subject to a potential final, non-material post-closing adjustments. In connection with the closing, there was a working capital adjustment of $0.5 million and the Company received a cash payment of $30.2 million. The remaining cash payment of $3.4 million of the aggregate consideration will be held back until March 31, 2014 to secure the Company's indemnification obligations subject to and in accordance with the terms of the Purchase Agreement. The distribution of this holdback amount is subject to any indemnification claims that the buyer may have under the terms of the Purchase Agreement and final resolution of any such claims.
	TPack operated as part of the Company's Connectivity reporting unit. The sale of TPack does not represent an exit from the Connectivity business. The Company will continue to sell Connectivity technology products as an ongoing part of its business, and as such the sale of TPack is not a discontinuance of an operation.
	In connection with the divestiture, we recorded a gain of $19.7 million. The following table summarizes the components of the gain (in thousands):
	Total proceeds, net of working capital adjustment,	$	30,175
	Net assets and liabilities	(184		)
	Goodwill write off	(1,757		)
	Intangibles write off	(11,404		)
	Holdback amount	3,353
	Legal fees and other costs	(484		)
	Gain on sale of TPack	$	19,699
	The total assets of TPack included $0.7 million of cash, cash equivalents and short term investments.

Subsequent_Events

Subsequent Events	9 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	On January 22, 2014, the “Company” entered into an agreement to sell its headquarters building and related parcel of land in Sunnyvale, California, for a purchase price of $40.8 million in cash. The closing of the sale is scheduled to occur on or before March 13, 2014, and is subject to a limited set of closing conditions. In connection with the execution of the agreement, the purchaser provided a non-refundable cash deposit of $7.0 million.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	The Condensed Consolidated Financial Statements include all the accounts of AppliedMicro (the "Company") and its wholly-owned subsidiaries including Veloce Technologies Inc. (“Veloce”), which was consolidated in prior accounting periods prior to its merger with the Company, as a variable interest entity (“VIE”) since the Company was determined to be its primary beneficiary. On June 20, 2012, the Company completed the acquisition of Veloce which became a wholly owned subsidiary of the Company as of this date. See Note 4, Veloce, to the Condensed Consolidated Financial Statements. All significant intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	'
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of net revenue and expenses in the reporting period. The Company regularly evaluates estimates and assumptions related to its:
	•	capitalized mask sets including their useful lives, which affect cost of goods sold and property and equipment or Research and Development ("R&D") expenses, if not capitalized;
	•	inventory valuation, warranty liabilities and revenue reserves, which affects cost of sales, gross margin, and revenues;
	•	allowance for doubtful accounts, which affects operating expenses;
	•	unrealized losses or other-than-temporary impairments of short-term investments available for sale, which affects interest income (expense), net;
	•	valuation of purchased intangibles and goodwill, which affects amortization and impairments of purchased intangibles, impairments of goodwill and apportionment of goodwill related to divestitures;
	•	Veloce accrued liability which considers: (i) estimating the total value of the expected Veloce consideration, (ii) determining the stage at which a milestone is deemed to be probable of attainment, (iii) the estimated progress towards achieving the milestone at the time such milestone was deemed probable of achievement and (iv) estimating the approximate timing of the expected completion of the milestones and related payments;
	•	potential costs of litigation, which affects operating expenses;
	•	valuation of deferred income taxes, which affects income tax expense (benefit); and
	•	stock-based compensation, which affects gross margin and operating expenses.
	The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The actual results experienced by the Company may differ materially and adversely from management’s estimates. To the extent there are material differences between the estimates and the actual results, future results of operations will be affected.

Certain_Financial_Statement_In1

Certain Financial Statement Information (Tables)	9 Months Ended
	Dec. 31, 2013
Certain Financial Statement Information [Abstract]	'
Schedule of Accounts receivable	'
	Accounts receivable:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Accounts receivable		$	29,281			$	25,278
	Less: allowance for bad debts		(481		)		(703		)
			$	28,800			$	24,575
Schedule of Inventories	'
	Inventories:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Finished goods		$	4,513			$	7,247
	Work in process		4,637				4,098
	Raw materials		1,332				1,555
			$	10,482			$	12,900
Schedule of Assets Held-for-sale	'
	Assets held for sale:
		December 31,				March 31,
		2013				2013
		(In thousands)
	Assets held for sale	$	14,260			$	—
Schedule of Other current assets	'
	Other current assets:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Prepaid expenses		$	11,177			$	13,762
	Executive deferred compensation assets		1,157				693
	Deposits		653				828
	Receivable from sale of strategic investment and TPack		3,353				1,331
	Other		1,489				1,384
			$	17,829			$	17,998
Schedule of Property and equipment	'
	Property and equipment:
			Useful		December 31,				March 31,
			Life		2013				2013
			(In years)		(In thousands)
	Machinery and equipment *		7-May		$	44,887			$	40,063
	Leasehold improvements **		15-Jan		9,011				14,202
	Computers, office furniture and equipment		7-Mar		43,992				43,485
	Buildings **		31.5		—				2,756
	Land **		—		—				9,800
					97,890				110,306
	Less: accumulated depreciation and amortization				(77,718		)		(75,915		)
					$	20,172			$	34,391
	* Includes capitalized mask costs.
	** December 31, 2013 balances exclude $14.3 million, including land, building and leasehold improvements related to the Company's headquarters in Sunnyvale, California, which have been reclassified as assets held for sale and included under current assets.
Schedule of Goodwill	'
	Goodwill is as follows:
		December 31,				March 31,
		2013				2013
		(In thousands)
	Goodwill	$	11,425			$	13,183
Schedule of Purchased intangible assets	'
	Purchase-related intangibles are as follows:
			31-Dec-13															31-Mar-13
			Gross				Accumulated				Net				Weighted			Gross			Accumulated				Net				Weighted
							Amortization								average						Amortization								average
							and Impairments								remaining						and Impairments								remaining
															useful life														useful life
			(In thousands)												(In years)			(In thousands)											(In years)
	Developed technology/in-process research and development		$	425,000			$	(425,000	)		$	—			—			$	441,300		$	(431,771	)		$	9,529			3.5
	Customer relationships		6,330				(6,163		)		167				0.7			12,830			(10,507		)		2,323				2.1
	Patents/core technology rights/tradename		62,306				(62,306		)		—				—			63,206			(63,067		)		139				0.3
			$	493,636			$	(493,469	)		$	167						$	517,336		$	(505,345	)		$	11,991
	During the quarter ended June 30, 2013, $11.4 million of purchased intangibles were written off pursuant to the sale of TPack. Please refer to Note 8, Sale of TPack A/S, to the Condensed Consolidated Financial Statements for further discussion.
Schedule of Estimated future amortization expense of purchased intangible assets	'
	As of December 31, 2013, the estimated future amortization expense of purchased intangible assets to be charged to operating expenses was as follows (in thousands):
			Operating
			Expenses
	Fiscal Years Ending March 31,
	2014 (remainder of year)		$	63
	2015		104
	Total		$	167
Schedule of Other assets	'
	Other assets:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Non-current portion of prepaid expenses		$	4,842			$	7,866
	Strategic investments		3,000				3,000
			$	7,842			$	10,866
Schedule of Other accrued liabilities	'
	Other accrued liabilities:
			December 31,				March 31,
			2013				2013
			(In thousands)
	Employee related liabilities		$	1,902			$	2,236
	Executive deferred compensation		1,415				1,284
	Income taxes		1,254				903
	Professional fees		2,033				3,840
	Other		4,574				2,467
			$	11,178			$	10,730
Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments	'
	The following is a summary of cash, cash equivalents and available-for-sale investments by type of instrument (in thousands):
			31-Dec-13																31-Mar-13
			Amortized				Gross Unrealized								Estimated				Amortized			Gross Unrealized								Estimated
			Cost				Gains				Losses				Fair Value				Cost			Gains				Losses				Fair Value
	Cash		$	19,716			$	—			$	—			$	19,716			$	8,529		$	—			$	—			$	8,529
	Cash equivalents		3,914				—				—				3,914				10,536			—				—				10,536
	U.S. Treasury securities and agency bonds		11,747				8				(4		)		11,751				12,363			10				—				12,373
	Corporate bonds		15,482				56				(4		)		15,534				15,567			63				(2		)		15,628
	Mortgage-backed and asset-backed securities*		4,015				300				(47		)		4,268				3,655			355				(7		)		4,003
	Closed-end bond funds		14,374				2,261				(818		)		15,817				21,914			5,340				(39		)		27,215
	Preferred stock		2,406				878				—				3,284				4,878			2,314				—				7,192
			$	71,654			$	3,503			$	(873	)		$	74,284			$	77,442		$	8,082			$	(48	)		$	85,476
	Reported as:
	Cash and cash equivalents														$	23,630														$	19,065
	Short-term investments available-for-sale														50,654															66,411
															$	74,284														$	85,476
	* At December 31, 2013 and March 31, 2013, approximately $1.1 million and $1.4 million of the estimated fair value presented were mortgage-backed securities, respectively.
Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments measured at fair value on recurring basis	'
	The following is a summary of cash, cash equivalents and available-for-sale investments by type of instrument measured at fair value on a recurring basis (in thousands):
			31-Dec-13																31-Mar-13
			Level 1				Level 2				Level 3				Total				Level 1			Level 2				Level 3				Total
	Cash		$	19,716			$	—			$	—			$	19,716			$	8,529		$	—			$	—			$	8,529
	Cash equivalents		3,914				—				—				3,914				9,508			1,028				—				10,536
	U.S. Treasury securities and agency bonds		11,596				155				—				11,751				12,373			—				—				12,373
	Corporate bonds		—				15,534				—				15,534				—			15,628				—				15,628
	Mortgage-backed and asset-backed securities		—				4,268				—				4,268				—			4,003				—				4,003
	Closed-end bond funds		15,817				—				—				15,817				27,215			—				—				27,215
	Preferred stock		—				3,284				—				3,284				—			7,192				—				7,192
			$	51,043			$	23,241			$	—			$	74,284			$	57,625		$	27,851			$	—			$	85,476
Schedule of Cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity	'
	The following is a summary of the cost and estimated fair values of available-for-sale securities with stated maturities, which include U.S. Treasury securities and agency bonds, corporate bonds and mortgage-backed and asset-backed securities, by contractual maturity (in thousands):
			31-Dec-13								31-Mar-13
			Cost				Estimated Fair Value				Cost				Estimated Fair Value
	Less than 1 year		$	7,259			$	7,411			$	9,205			$	9,217
	Mature in 1 – 2 years		22,341				22,369				19,843				20,040
	Mature in 3 – 5 years		707				771				1,575				1,649
	Mature after 5 years		937				1,002				962				1,098
			$	31,244			$	31,553			$	31,585			$	32,004
Schedule of Gross unrealized losses	'
	The following is a summary of gross unrealized losses as of (in thousands):
			Less Than 12 Months of								12 Months or More of								Total
			Unrealized Losses								Unrealized Losses
	As of December 31, 2013		Estimated				Gross				Estimated				Gross				Estimated			Gross
			Fair				Unrealized				Fair				Unrealized				Fair			Unrealized
			Value				Losses				Value				Losses				Value			Losses
	U.S. Treasury securities and agency bonds		$	2,566			$	(4	)		$	—			$	—			$	2,566		$	(4	)
	Corporate bonds		2,811				(4		)		—				—				2,811			(4		)
	Mortgage-backed and asset-backed securities		1,451				(47		)		6				—				1,457			(47		)
	Closed-end bond funds		6,344				(721		)		377				(97		)		6,721			(818		)
			$	13,172			$	(776	)		$	383			$	(97	)		$	13,555		$	(873	)
			Less Than 12 Months of								12 Months or More of								Total
			Unrealized Losses								Unrealized Losses
	As of March 31, 2013		Estimated				Gross				Estimated				Gross				Estimated			Gross
			Fair				Unrealized				Fair				Unrealized				Fair			Unrealized
			Value				Losses				Value				Losses				Value			Losses
	U.S. Treasury securities and agency bonds		$	300			$	—			$	—			$	—			$	300		$	—
	Corporate bonds		2,276				(2		)		113				—				2,389			(2		)
	Mortgage-backed and asset-backed securities		647				(3		)		—				(4		)		647			(7		)
	Closed-end bond funds		—				—				6,991				(39		)		6,991			(39		)
			$	3,223			$	(5	)		$	7,104			$	(43	)		$	10,327		$	(48	)
Schedule of Warranty reserve activity	'
	The following table summarizes warranty reserve activity (in thousands):
		Three Months Ended								Nine Months Ended
		December 31,								December 31,
		2013				2012				2013				2012
	Beginning balance	$	187			$	370			$	220			$	454
	Charged to costs of revenues	54				96				28				311
	Cost incurred	(39		)		(108		)		(46		)		(407		)
	Ending balance	$	202			$	358			$	202			$	358
Schedule of Interest income, net	'
	Interest income (expense), net (in thousands):
			Three Months Ended								Nine Months Ended
			December 31,								December 31,
			2013				2012				2013				2012
	Interest income		$	519			$	685			$	1,389			$	1,915
	Net realized gain on short-term investments		6				207				3,290				1,401
			$	525			$	892			$	4,679			$	3,316
Schedule of Reconciliation of shares used to calculate basic and diluted net loss per share	'
	The reconciliation of shares used to calculate basic and diluted net loss per share consists of the following (in thousands, except per share data):
			Three Months Ended								Nine Months Ended
			December 31,								December 31,
			2013				2012				2013				2012
	Net loss		$	(7,284	)		$	(71,562	)		$	(28,810	)		$	(116,509	)
	Shares used in net loss per share computation:
	Weighted average common shares outstanding, basic		73,989				66,113				71,986				64,489
	Net effect of dilutive common share equivalents		—				—				—				—
	Weighted average common shares outstanding, diluted		73,989				66,113				71,986				64,489
	Basic and diluted net loss per share		$	(0.10	)		$	(1.08	)		$	(0.40	)		$	(1.81	)

Restructuring_Charges_Tables

Restructuring Charges (Tables)	9 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Schedule of restructuring activity	'
	The restructuring activity during the three and nine months ended December 31, 2013 relating to the December 2012 and August 2013 restructuring programs is as follows (in thousands):
		Workforce Reduction			Asset Impairment			Total
	Liability, March 31, 2013	$	548		$	—		$	548
	Restructuring charges	93			—			$	93
	Cash payments	(334		)	—			$	(334	)
	Liability, June 30, 2013	307			—			307
	Restructuring charges	727			272			999
	Non-cash items	—			(272		)	(272		)
	Cash payments	(847		)	—			(847		)
	Liability, September 30, 2013	$	187		$	—		$	187
	Restructuring charges	38			—			38
	Cash payments	(225		)	—			(225		)
	Liability, December 31, 2013	—			—			—

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Schedule of Option Activity Under Stock Incentive Plans	'
	Option activity under the Company’s stock incentive plans during the nine months ended December 31, 2013 is set forth below (in thousands, except per share data):
			Number of Shares		Weighted Average
					Exercise Price
					Per Share
	Outstanding at the beginning of the year		3,492		$	10.26
	Granted		40		7.35
	Exercised		(641	)	9.5
	Cancelled		(420	)	11.36
	Outstanding at the end of the period		2,471		$	10.22
	Vested and expected to vest at the end of the period		2,470		$	10.22
	Vested and exercisable at the end of the period		2,344		$	10.31
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable	'
	The weighted average remaining contractual life and weighted average per share exercise price of options outstanding and of options exercisable as of December 31, 2013 were as follows (in thousands, except exercise prices and years):
			Options Outstanding						Options Exercisable
	Range of Exercise Prices		Number of		Weighted		Weighted		Number of	Weighted
			Shares		Average		Average		Shares	Average
					Remaining		Exercise Price			Exercise Price
					Contractual
					Life
	$  1.68 - $ 7.60		562		3.28		$	6.71	473	$	6.63
	7.61 - 7.67		650		2.58		7.67		650	7.67
	7.68 - 11.86		430		3.55		10.49		406	10.42
	11.87 - 14.20		493		2.61		12.87		478	12.89
	14.21 - 23.32		336		1.55		16.78		337	16.78
	$  1.68 - $23.32		2,471		2.77		$	10.22	2,344	$	10.31
Schedule of Restricted Stock Unit Activity	'
	Restricted stock unit activity during the nine months ended December 31, 2013 is set forth below (in thousands):
		Number of Shares
	Outstanding at the beginning of the year	6,444
	Awarded	3,069
	Vested	(2,048	)
	Cancelled	(1,510	)
	Outstanding at the end of the period	5,955

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Weighted-Average Assumptions Used to Estimate the Fair Value of Stock Options	'
	The Company did not grant options or employee stock purchase rights during the three months ended December 31, 2013 and 2012. The fair value of the options and employee stock purchase rights granted during the nine months ended December 31, 2013 and 2012 is estimated as of the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:
		Nine Months Ended December 31,
		Employee Stock						ESPP
		Options
		2013			2012			2013			2012
	Expected life (years)	4.4			4.5			0.5			0.5
	Risk-free interest rate	0.6		%	0.7		%	0.1		%	0.2		%
	Volatility	49		%	54		%	57		%	50		%
	Dividend yield	—		%	—		%	—		%	—		%
	Weighted average fair value	$	2.95		$	2.47		$	3.67		$	1.5
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units	'
	The following table summarizes stock-based compensation expense related to stock options and RSUs (in thousands):
		Three Months Ended						Nine Months Ended
		December 31,						December 31,
		2013			2012			2013			2012
	Stock-based compensation expense by type of award
	Stock options	$	648		$	935		$	1,987		$	3,024
	Restricted stock units	5,231			5,276			11,454			18,427
	Total stock-based compensation	5,879			6,211			13,441			21,451
	Stock-based compensation (capitalized to) expensed from inventory	3			11			(11		)	94
	Total stock-based compensation expense	$	5,882		$	6,222		$	13,430		$	21,545
Summary of Stock-Based Compensation Expense	'
	The following table summarizes stock-based compensation expense as it relates to the Company’s Condensed Consolidated Statement of Operations (in thousands):
		Three Months Ended						Nine Months Ended
		December 31,						December 31,
		2013			2012			2013			2012
	Stock-based compensation expense by cost centers
	Cost of revenues	$	118		$	147		$	353		$	502
	Research and development	1,545			2,814			4,867			10,733
	Selling, general and administrative	4,216			3,250			8,221			10,216
	Total stock-based compensation	$	5,879		$	6,211		$	13,441		$	21,451
	Stock-based compensation (capitalized to) expensed from inventory	3			11			(11		)	94
	Total stock-based compensation expense	$	5,882		$	6,222		$	13,430		$	21,545

Sale_of_TPack_AS_Tables

Sale of TPack A/S (Tables)	9 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	In connection with the divestiture, we recorded a gain of $19.7 million. The following table summarizes the components of the gain (in thousands):
	Total proceeds, net of working capital adjustment,	$	30,175
	Net assets and liabilities	(184		)
	Goodwill write off	(1,757		)
	Intangibles write off	(11,404		)
	Holdback amount	3,353
	Legal fees and other costs	(484		)
	Gain on sale of TPack	$	19,699

Certain_Financial_Statement_In2

Certain Financial Statement Information Accounts Receivable (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Accounts receivable	'	'
Accounts receivable	$29,281	$25,278
Less: allowance for bad debts	-481	-703
Accounts receivable, net	$28,800	$24,575	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In3

Certain Financial Statement Information Inventories (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Inventories	'	'
Finished goods	$4,513	$7,247
Work in process	4,637	4,098
Raw materials	1,332	1,555
Inventories, total	$10,482	$12,900	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In4

Certain Financial Statement Information Assets Held for Sale (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Certain Financial Statement Information [Abstract]	'	'
Assets held for sale	$14,260	$0

Certain_Financial_Statement_In5

Certain Financial Statement Information Other Current Assets (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Other current assets	'	'
Prepaid expenses	$11,177	$13,762
Executive deferred compensation assets	1,157	693
Deposits	653	828
Receivable from sale of strategic investment and TPack	3,353	1,331
Other	1,489	1,384
Other current assets, total	$17,829	$17,998	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In6

Certain Financial Statement Information Property and Equipment (Details) (USD $)	Dec. 31, 2013		Mar. 31, 2013		Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Thousands, unless otherwise specified					Machinery and Equipment [Member]	Machinery and Equipment [Member]	Leasehold Improvements [Member]	Leasehold Improvements [Member]	Computers, Office Furniture and Equipment [Member]	Computers, Office Furniture and Equipment [Member]	Buildings [Member]
					Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]
Schedule of Property and equipment	'		'		'	'	'	'	'	'	'
Useful life	'		'		'5 years	'7 years	'1 year	'15 years	'3 years	'7 years	'31 years 6 months
Machinery and equipment	$44,887	[1]	$40,063	[1]	'	'	'	'	'	'	'
Leasehold improvements	9,011	[2]	14,202		'	'	'	'	'	'	'
Computers, office furniture and equipment	43,992		43,485		'	'	'	'	'	'	'
Buildings	0	[2]	2,756		'	'	'	'	'	'	'
Land	0	[2]	9,800		'	'	'	'	'	'	'
Property and equipment, gross	97,890		110,306		'	'	'	'	'	'	'
Less: accumulated depreciation and amortization	-77,718		-75,915		'	'	'	'	'	'	'
Property and equipment, net	$20,172		$34,391	[3]	'	'	'	'	'	'	'
[1]	Includes capitalized mask costs.
[2]	December 31, 2013 balances exclude $14.3 million, including land, building and leasehold improvements related to the Company's headquarters in Sunnyvale, California, which have been reclassified as assets held for sale and included under current assets.
[3]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In7

Certain Financial Statement Information Goodwill (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013		Dec. 31, 2013
In Thousands, unless otherwise specified				TPack [Member]
Schedule of Goodwill	'	'		'
Goodwill	$11,425	$13,183	[1]	'
Goodwill write off	'	'		$1,800
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In8

Certain Financial Statement Information Purchased Intangibles (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013		Apr. 22, 2013	Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified				TPack [Member]	Developed technology/in-process research and development [Member]		Developed technology/in-process research and development [Member]	Customer relationships [Member]	Customer relationships [Member]	Patents/core technology rights/tradename [Member]	Patents/core technology rights/tradename [Member]
Schedule of Purchased Intangible assets	'	'		'	'		'	'	'	'	'
Gross Assets	$493,636	$517,336		'	$425,000	[1]	$441,300	$6,330	$12,830	$62,306	$63,206
Accumulated Amortization and Impairments	-493,469	-505,345		'	-425,000	[1]	-431,771	-6,163	-10,507	-62,306	-63,067
Intangible Assets, Net (Excluding Goodwill)	167	11,991	[2]	'	0	[1]	9,529	167	2,323	0	139
Weighted average remaining useful life	'	'		'	'0 years	[1]	'3 years 6 months	'8 months 12 days	'2 years 1 month 6 days	'0 years	'3 months 18 days
Intangibles write off	'	'		$11,404	'		'	'	'	'	'
[1]	During the quarter ended June 30, 2013, $11.4 million of purchased intangibles were written off pursuant to the sale of TPack. Please refer to Note 8, Sale of TPack A/S, to the Condensed Consolidated Financial Statements for further discussion.
[2]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Certain_Financial_Statement_In9

Certain Financial Statement Information Future Amortization Expense (Details) (Operating Expenses [Member], USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Expenses [Member]	'
Schedule of Estimated Future Amortization Expense [Line Items]	'
2014 (remainder of year)	$63
2015	104
Total	$167

Recovered_Sheet1

Certain Financial Statement Information Other Assets (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of other assets	'	'
Non-current portion of prepaid expenses	$4,842	$7,866
Strategic investments	3,000	3,000
Total other assets	$7,842	$10,866	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Recovered_Sheet2

Certain Financial Statement Information Other Accrued Liabiliteis (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of other accrued liabilities	'	'
Employee related liabilities	$1,902	$2,236
Executive deferred compensation	1,415	1,284
Income taxes	1,254	903
Professional fees	2,033	3,840
Other	4,574	2,467
Total other accrued liabilities	$11,178	$10,730	[1]
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.

Recovered_Sheet3

Certain Financial Statement Information Short-Term Investments (Details) (USD $)	9 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Mar. 31, 2013		Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'		'	'		'
Cost method investment, ownership percentage (less than)	20.00%		'	'		'
Investments in non-marketable equity investments, cost method	$0		$500,000	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	71,654,000		'	77,442,000		'
Available for sale Securities Gross Unrealized Gains	3,503,000		'	8,082,000		'
Available For Sale Securities Gross Unrealized Losses	-873,000		'	-48,000		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	74,284,000		'	85,476,000		'
Cash and cash equivalents	23,630,000		15,683,000	19,065,000	[1]	28,065,000
Short-term investments available-for-sale	50,654,000		'	66,411,000	[1]	'
Cash [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	19,716,000		'	8,529,000		'
Available for sale Securities Gross Unrealized Gains	0		'	0		'
Available For Sale Securities Gross Unrealized Losses	0		'	0		'
Cash and Cash equivalents, Estimated Fair Value	19,716,000		'	8,529,000		'
Cash equivalents [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	3,914,000		'	10,536,000		'
Available for sale Securities Gross Unrealized Gains	0		'	0		'
Available For Sale Securities Gross Unrealized Losses	0		'	0		'
Cash and Cash equivalents, Estimated Fair Value	3,914,000		'	10,536,000		'
U.S Treasury securities and agency bonds [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	11,747,000		'	12,363,000		'
Available for sale Securities Gross Unrealized Gains	8,000		'	10,000		'
Available For Sale Securities Gross Unrealized Losses	-4,000		'	0		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	11,751,000		'	12,373,000		'
Corporate bonds [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	15,482,000		'	15,567,000		'
Available for sale Securities Gross Unrealized Gains	56,000		'	63,000		'
Available For Sale Securities Gross Unrealized Losses	-4,000		'	-2,000		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	15,534,000		'	15,628,000		'
Mortgage-backed and asset-backed securities [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	4,015,000		'	3,655,000		'
Available for sale Securities Gross Unrealized Gains	300,000		'	355,000		'
Available For Sale Securities Gross Unrealized Losses	-47,000		'	-7,000		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	4,268,000	[2]	'	4,003,000	[2]	'
Closed-end bond funds [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	14,374,000		'	21,914,000		'
Available for sale Securities Gross Unrealized Gains	2,261,000		'	5,340,000		'
Available For Sale Securities Gross Unrealized Losses	-818,000		'	-39,000		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	15,817,000		'	27,215,000		'
Preferred stock [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Amortized Cost	2,406,000		'	4,878,000		'
Available for sale Securities Gross Unrealized Gains	878,000		'	2,314,000		'
Available For Sale Securities Gross Unrealized Losses	0		'	0		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	3,284,000		'	7,192,000		'
Mortgage-backed securities [Member]	'		'	'		'
Schedule of cash, cash equivalents and available-for-sale investments by type of instruments	'		'	'		'
Cash, Cash equivalents and Short-term investments, Estimated Fair Value	$1,100,000	[2]	'	$1,400,000	[2]	'
[1]	Amounts have been derived from the March 31, 2013 audited consolidated financial statements.
[2]	At December 31, 2013 and March 31, 2013, approximately $1.1 million and $1.4 million of the estimated fair value presented were mortgage-backed securities, respectively.

Recovered_Sheet4

Certain Financial Statement Information Fair Value (Details) (USD $)	Dec. 31, 2013		Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	$74,284		$85,476
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis	74,284		85,476
Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis	51,043		57,625
Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis	23,241		27,851
Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis	0		0
Cash [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	19,716		8,529
Cash [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	19,716		8,529
Cash [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	0		0
Cash [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	0		0
Cash equivalents [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	3,914		10,536
Cash equivalents [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	3,914		9,508
Cash equivalents [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	0		1,028
Cash equivalents [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash and cash equivalents measured at fair value on a recurring basis	0		0
U.S Treasury securities and agency bonds [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	11,751		12,373
U.S Treasury securities and agency bonds [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	11,596		12,373
U.S Treasury securities and agency bonds [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	155		0
U.S Treasury securities and agency bonds [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Corporate bonds [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	15,534		15,628
Corporate bonds [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Corporate bonds [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	15,534		15,628
Corporate bonds [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Mortgage-backed and asset-backed securities [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	4,268	[1]	4,003	[1]
Mortgage-backed and asset-backed securities [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Mortgage-backed and asset-backed securities [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	4,268		4,003
Mortgage-backed and asset-backed securities [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Closed-end bond funds [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	15,817		27,215
Closed-end bond funds [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	15,817		27,215
Closed-end bond funds [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Closed-end bond funds [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Preferred stock [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	3,284		7,192
Preferred stock [Member] | Level 1 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	0		0
Preferred stock [Member] | Level 2 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	3,284		7,192
Preferred stock [Member] | Level 3 [Member]	'		'
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments by Type of Instruments Measured at Fair Value on Recurring Basis	'		'
Cash, cash equivalents and short term investments, measured at fair value on a recurring basis	$0		$0
[1]	At December 31, 2013 and March 31, 2013, approximately $1.1 million and $1.4 million of the estimated fair value presented were mortgage-backed securities, respectively.

Recovered_Sheet5

Certain Financial Statement Information Cost and Fair Value of Available-for-Sale Securities (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity	'	'
Less than 1 year, Cost	$7,259	$9,205
Mature in 1 - 2 years, Cost	22,341	19,843
Mature in 3 - 5 years, Cost	707	1,575
Mature after 5 years, Cost	937	962
Cost, Total	31,244	31,585
Less than 1 year, Fair Value	7,411	9,217
Mature in 1 - 2 years, Fair Value	22,369	20,040
Mature in 3 - 5 years, Fair Value	771	1,649
Mature after 5 years, Fair Value	1,002	1,098
Fair Value, Total	$31,553	$32,004

Recovered_Sheet6

Certain Financial Statement Information Gross Unrealized Losses (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Schedule of Gross Unrealized Losses	'	'
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	$13,172	$3,223
Less than 12 Months of Unrealized Losses, Gross Unrealized Losses	-776	-5
12 Months or More of Unrealized Losses, Estimated Fair Value	383	7,104
12 Months or More of Unrealized Losses, Gross Unrealized Losses	-97	-43
Total, Estimated Fair Value	13,555	10,327
Total Gross Unrealized Losses	-873	-48
Gross Unrealized Gains	3,503	8,082
U.S Treasury securities and agency bonds [Member]	'	'
Schedule of Gross Unrealized Losses	'	'
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	2,566	300
Less than 12 Months of Unrealized Losses, Gross Unrealized Losses	-4	0
12 Months or More of Unrealized Losses, Estimated Fair Value	0	0
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	0
Total, Estimated Fair Value	2,566	300
Total Gross Unrealized Losses	-4	0
Gross Unrealized Gains	8	10
Corporate bonds [Member]	'	'
Schedule of Gross Unrealized Losses	'	'
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	2,811	2,276
Less than 12 Months of Unrealized Losses, Gross Unrealized Losses	-4	-2
12 Months or More of Unrealized Losses, Estimated Fair Value	0	113
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	0
Total, Estimated Fair Value	2,811	2,389
Total Gross Unrealized Losses	-4	-2
Gross Unrealized Gains	56	63
Mortgage-backed and asset-backed securities [Member]	'	'
Schedule of Gross Unrealized Losses	'	'
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	1,451	647
Less than 12 Months of Unrealized Losses, Gross Unrealized Losses	-47	-3
12 Months or More of Unrealized Losses, Estimated Fair Value	6	0
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	-4
Total, Estimated Fair Value	1,457	647
Total Gross Unrealized Losses	-47	-7
Gross Unrealized Gains	300	355
Closed-end bond funds [Member]	'	'
Schedule of Gross Unrealized Losses	'	'
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	6,344	0
Less than 12 Months of Unrealized Losses, Gross Unrealized Losses	-721	0
12 Months or More of Unrealized Losses, Estimated Fair Value	377	6,991
12 Months or More of Unrealized Losses, Gross Unrealized Losses	-97	-39
Total, Estimated Fair Value	6,721	6,991
Total Gross Unrealized Losses	-818	-39
Gross Unrealized Gains	$2,261	$5,340

Recovered_Sheet7

Certain Financial Statement Information Warranty (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Schedule of Warranty Reserve Activity	'	'	'	'
Beginning balance	$187	$370	$220	$454
Charged to costs of revenues	54	96	28	311
Charges incurred	-39	-108	-46	-407
Ending balance	$202	$358	$202	$358

Recovered_Sheet8

Certain Financial Statement Information Interest Income/Expense (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Schedule of Interest Income, Net	'	'	'	'
Interest income	$519	$685	$1,389	$1,915
Net realized gain on short-term investments	6	207	3,290	1,401
Interest income, net	$525	$892	$4,679	$3,316

Recovered_Sheet9

Certain Financial Statement Information Net Income/Loss Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Net (Loss) Income Per Share	'	'	'	'
Net loss (USD)	($7,284)	($71,562)	($28,810)	($116,509)
Shares used in net loss per share computation:	'	'	'	'
Weighted average common shares outstanding, basic	73,989	66,113	71,986	64,489
Net effect of dilutive common share equivalents	0	0	0	0
Weighted average common shares outstanding, diluted	73,989	66,113	71,986	64,489
Basic and diluted net loss per share (in dollars per share)	($0.10)	($1.08)	($0.40)	($1.81)

Recovered_Sheet10

Certain Financial Statement Information (Details Textual) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
Share data in Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jan. 22, 2014
						Options and Restricted Stock Units [Member]	Options and Restricted Stock Units [Member]	Options and Restricted Stock Units [Member]	Options and Restricted Stock Units [Member]	Subsequent Event [Member]
Certain Financial Statement Information [Line Items]	'	'	'	'	'	'	'	'	'	'
Property held-for-sale, sale price	'	'	'	'	'	'	'	'	'	$40,800,000
Gross Unrealized Gains	$3,503,000	'	$3,503,000	'	$8,082,000	'	'	'	'	'
Anti-dilutive securities that have been excluded from the net (loss) income, per share computation	5.6	6.8	6.1	9.4	'	3.8	5.4	4.7	8.7	'
Effect of dilutive securities that have been excluded from the net loss per share computation	'	'	'	'	'	1.8	1.4	1.4	0.7	'

Restructuring_Charges_Details_

Restructuring Charges (Details Textual) (USD $)	1 Months Ended	9 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012	Sep. 30, 2013	Aug. 31, 2013	Aug. 31, 2013	Aug. 31, 2013
	December 2012 Restructuring Program [Member]	December 2012 Restructuring Program [Member]	December 2012 Restructuring Program [Member]	December 2012 Restructuring Program [Member]	December 2012 Restructuring Program [Member]	December 2012 Restructuring Program [Member]	August 2013 Restructuring Program [Member]	August 2013 Restructuring Program [Member]	August 2013 Restructuring Program [Member]	August 2013 Restructuring Program [Member]
	employee		Workforce Reduction [Member]	Workforce Reduction [Member]	Other Operational Expense [Member]	Other Operational Expense [Member]		employee	Workforce Reduction [Member]	Other Operational Expense [Member]
			Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]
Restructuring Charges (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'
Number of positions eliminated	70	'	'	'	'	'	'	20	'	'
Anticipated reduction in expenses	'	'	$8	$9	$4	$5	'	'	$3	$0.50
Restructuring costs incurred to date and expected to be incurred	'	1.8	'	'	'	'	'	'	'	'
Restructuring costs expected to be recognized	'	'	'	'	'	'	$1	'	'	'

Restructuring_Charges_Details_1

Restructuring Charges (Details 1) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]	'	'	'	'	'	'
Liability, beginning balance	$187	$307	$548	'	$548	'
Restructuring charges	38	999	93	6,218	1,130	6,218
Non-cash items	'	-272	'	'	'	'
Cash payments	-225	-847	-334	'	'	'
Liability, ending balance	0	187	307	'	0	'
Workforce Reduction	'	'	'	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'	'	'	'
Liability, beginning balance	187	307	548	'	548	'
Restructuring charges	38	727	93	'	'	'
Non-cash items	'	0	'	'	'	'
Cash payments	-225	-847	-334	'	'	'
Liability, ending balance	0	187	307	'	0	'
Asset Impairment	'	'	'	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'	'	'	'
Liability, beginning balance	0	0	0	'	0	'
Restructuring charges	0	272	0	'	'	'
Non-cash items	'	-272	'	'	'	'
Cash payments	0	0	0	'	'	'
Liability, ending balance	$0	$0	$0	'	$0	'

Veloce_Details_Textual

Veloce (Details Textual) (Veloce Technologies Inc [Member], USD $)	3 Months Ended		6 Months Ended	9 Months Ended		18 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jun. 20, 2012
Veloce Technologies Inc [Member]	'	'	'	'	'	'	'
Veloce (Textual) [Abstract]	'	'	'	'	'	'	'
Total consideration to be transferred	'	$178.50	$178.50	'	$178.50	'	$135
Research and development expenses incurred	2.9	51.9	117	42.7	56.6	169.3	'
Payment of aggregate consideration as cash	1.2	1.1	'	45.4	15.9	'	'
Aggregate shares issued	0	200,000	'	3,800,000	2,800,000	'	'
Stock issued for acquisition, value	0.2	1.1	'	29.2	15.9	'	'
Issuance of additional units	1,400	'	'	500,000	'	'	'
Issuance of additional units, amount	0	'	'	5.9	'	'	'
Unallocated units	900,000	'	'	900,000	'	900,000	'
Unallocated units, maximum potential value	$9.20	'	'	$9.20	'	$9.20	'

Stockholders_Equity_Option_Act

Stockholders' Equity Option Activity (Details) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Schedule of Option Activity Under Stock Incentive Plans	'
Number of Shares, Outstanding at the beginning of the year	3,492
Number of Shares, Granted	40
Number of Shares, Exercised	-641
Number of Shares, Forfeited	-420
Number of Shares, Outstanding at the end of the period	2,471
Number of Shares, Vested at the end of the period	2,470
Schedule of Weighted Average Exercise Price Per Share Under Stock Incentive Plans	'
Weighted Average Exercise Price Per Share, Outstanding at the beginning of the year (USD per share)	$10.26
Weighted Average Exercise Price Per Share, Granted (USD per share)	$7.35
Weighted Average Exercise Price Per Share, Exercised (USD per share)	$9.50
Weighted Average Exercise Price Per Share, Forfeited (USD per share)	$11.36
Weighted Average Exercise Price Per Share, Outstanding at the end of the period (USD per share)	$10.22
Weighted Average Exercise Price Per Share, Vested at the end of the period (USD per share)	$10.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,344
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$10.31

Stockholders_Equity_Options_We

Stockholders' Equity Options Weighted Average Remaining Contractual Life and Exercise Price (Details) (USD $)	9 Months Ended	1 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	31-May-12	Nov. 30, 2011	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
		Performance-Based RSU [Member]	Performance-Based RSU [Member]	$ 1.68 - $ 7.60	7.61 - 7.67	7.68 - 11.86	11.87 - 14.20	14.21 - 23.32	$ 1.68 - $23.32
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	'	'12 years	'18 months	'	'	'	'	'	'
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable	'	'	'	'	'	'	'	'	'
Range of Exercise Price, minimum (USD per share)	'	'	'	$1.68	$7.61	$7.68	$11.87	$14.21	$1.68
Range of Exercise Price, maximum (USD per share)	'	'	'	$7.60	$7.67	$11.86	$14.20	$23.32	$23.32
Number of Shares, Options Outstanding	'	'	'	562	650	430	493	336	2,471
Weighted average remaining contractual term for options outstanding	'2 years 9 months 12 days	'	'	'3 years 3 months 11 days	'2 years 6 months 29 days	'3 years 6 months 18 days	'2 years 7 months 10 days	'1 year 6 months 18 days	'2 years 9 months 9 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	'	'	'	$6.71	$7.67	$10.49	$12.87	$16.78	$10.22
Number of Shares, Options Exercisable	'	'	'	473	650	406	478	337	2,344
Weighted Average Exercise Price, Options Exercisable (USD per share)	'	'	'	$6.63	$7.67	$10.42	$12.89	$16.78	$10.31

Stockholders_Equity_RSU_Activi

Stockholders' Equity RSU Activity (Details) (Restricted Stock Units (RSUs) [Member])	9 Months Ended
	Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]	'
Schedule of Restricted Stock Unit Activity	'
Restricted Stock Units Outstanding Number of Shares, Outstanding at the beginning of the year	6,444,000
Restricted Stock Units Awarded	3,069,000
Restricted Stock Units Vested	-2,048,000
Restricted Stock Units Cancelled	-1,510,000
Restricted Stock Units Outstanding Number of Shares, Outstanding at the end of the period	5,955,000

Stockholders_Equity_Details_Te

Stockholders' Equity (Details Textual) (USD $)

1 Months Ended

9 Months Ended

104 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

Oct. 31, 2008

Aug. 31, 2004

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Mar. 31, 2013

31-May-13

31-May-13

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Aug. 30, 2012

Dec. 31, 2012

Aug. 30, 2010

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Nov. 30, 2011

Nov. 30, 2011

31-May-12

Feb. 29, 2012

Nov. 30, 2011

Dec. 31, 2013

Apr. 30, 2011

Feb. 29, 2012

Jun. 30, 2012

31-May-13

31-May-13

Nov. 30, 2013

Nov. 30, 2013

Feb. 29, 2012

Dec. 31, 2013

Dec. 31, 2012

17-May-09

31-May-12

31-May-13

31-May-12

31-May-13

Approved_Plan

RSU plan post May 2006 [Member]

Minimum [Member]

Maximum [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Common Stock Subject to Repurchase [Member]

Performance-Based MSU [Member]

Performance-Based MSU [Member]

Officer [Member]

Officer [Member]

Officer [Member]

Veloce Technologies, Inc. [Member]

Veloce Technologies, Inc. [Member]

Veloce Technologies, Inc. [Member]

First Vesting Period [Member]

First Vesting Period [Member]

Second Vesting Period [Member]

Second Vesting Period [Member]

FY2014 Short Term Plan [Member]

FY2014 Short Term Plan [Member]

2012 Employee Stock Purchase Plan [Member]

2012 Employee Stock Purchase Plan [Member]

2012 Employee Stock Purchase Plan [Member]

1998 Employee Stock Purchase Plan [Member]

1998 Employee Stock Purchase Plan [Member]

RSU plan prior to May 2006 [Member]

RSU plan post May 2006 [Member]

Minimum [Member]

Maximum [Member]

milestone

milestone

April 2011 Plan [Member]

November 2011 and February 2012 Plan [Member]

Minimum [Member]

Maximum [Member]

Restricted Stock Units [Member]

Performance-Based RSU [Member]

Performance-Based RSU [Member]

Performance-Based MSU [Member]

Performance-Based MSU [Member]

quarter

November 2011 and February 2012 Plan [Member]

November 2011 and February 2012 Plan [Member]

Stockholders Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares authorized for issuance

'

'

2,000,000

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares outstanding

'

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

'

'

375,000,000

'

375,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

'

'

74,171,000

'

67,952,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock reserved for issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

6,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares available for future issuance

'

'

'

'

'

'

'

'

'

800,000

'

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of purchase price of common stock equal to fair market value

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued, employee stock purchase plan

'

'

'

'

'

'

'

'

0

300,000

0

'

400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program, authorized amount

'

$200,000,000

$15,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in the amount authorized for stock purchase program

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program, shares repurchased

'

'

0

100,000

17,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program, weighted average price per share

'

'

'

$5.18

$10.04

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of stockholder-approved plans

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of plans unapproved by stockholders

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award expiration period, in years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'12 years

'

'18 months

'

'3 years

'18 months

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period, in years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years

'4 years

'1 year

'18 months

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vested in first period of employment

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares outstanding

'

'

2,471,000

'

3,492,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average remaining contractual term for options outstanding

'

'

'2 years 9 months 12 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate pretax intrinsic value of options exercised

'

'

1,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pre-tax intrinsic value of options outstanding

'

'

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pre-tax intrinsic value of options exercisable

'

'

8,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, closing price per share

'

'

$13.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award vesting period, quarters

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock units awarded

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,069,000

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

300,000

500,000

'

'

'

'

'

'

'

Number of milestones

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grants in period, fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,200,000

3,700,000

'

'

'

'

'

'

'

Restricted stock units vested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,048,000

'

'

'

'

'

'

'

'

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

'

Number of milestones completed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award performance period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years

'

'3 years

Award vesting percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

150.00%

'

'

'

'

'

'

'

'

'

'

Award pay out percentage

'

'

'

'

'

'

50.00%

150.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average remaining contractual term for the restricted stock units outstanding, in years

'

'

'1 year 0 months 12 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate pre-tax intrinsic value of restricted stock units outstanding which includes performance based awards which are subject to milestone attainments

'

'

79,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement by Share Based Payment Award Equity Other than Options Aggregate Pre Tax Intrinsic Value Released

'

'

18,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of years of development work to be performed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

Stock-based compensation expense related to the acceleration of Veloce warrants

'

'

$0

$1,289,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,300,000

$1,300,000

'

'

'

'

'

Award vesting percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66.67%

'

33.33%

'

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Options [Member]	'	'
Schedule of Weighted-Average Assumptions Used to Estimate the Fair Value of Stock Options	'	'
Expected life	'4 years 4 months 24 days	'4 years 6 months
Risk-free interest rate	0.60%	0.70%
Volatility	49.00%	54.00%
Dividend yield	0.00%	0.00%
Weighted average fair value	$2.95	$2.47
Employee Stock Purchase Plans [Member]	'	'
Schedule of Weighted-Average Assumptions Used to Estimate the Fair Value of Stock Options	'	'
Expected life	'6 months	'6 months
Risk-free interest rate	0.10%	0.20%
Volatility	57.00%	50.00%
Dividend yield	0.00%	0.00%
Weighted average fair value	$3.67	$1.50

StockBased_Compensation_Detail1

Stock-Based Compensation (Details 1) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units	'	'	'	'
Stock options (including employee stock purchase program)	$5,879	$6,211	$13,441	$21,451
Stock-based compensation expensed from inventory	-3	-11	11	-94
Total stock-based compensation expense	5,882	6,222	13,430	21,545
Stock Options [Member]	'	'	'	'
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units	'	'	'	'
Stock options (including employee stock purchase program)	648	935	1,987	3,024
Restricted Stock Units [Member]	'	'	'	'
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units	'	'	'	'
Stock options (including employee stock purchase program)	$5,231	$5,276	$11,454	$18,427

StockBased_Compensation_Detail2

Stock-Based Compensation (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Summary of Stock-Based Compensation Expense	'	'	'	'
Stock based compensation	$5,879	$6,211	$13,441	$21,451
Stock-based compensation expensed from inventory	3	11	-11	94
Total stock-based compensation expense	5,882	6,222	13,430	21,545
Cost of Revenues [Member]	'	'	'	'
Summary of Stock-Based Compensation Expense	'	'	'	'
Stock based compensation	118	147	353	502
Research and Development [Member]	'	'	'	'
Summary of Stock-Based Compensation Expense	'	'	'	'
Stock based compensation	1,545	2,814	4,867	10,733
Selling, General and Administrative [Member]	'	'	'	'
Summary of Stock-Based Compensation Expense	'	'	'	'
Stock based compensation	$4,216	$3,250	$8,221	$10,216

StockBased_Compensation_Detail3

Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Stock Based Compensation (Textual) [Abstract]	'	'	'	'	'	'
Weighted average grant-date fair value per share of the restricted stock units awarded	$9.84	'	$6.13	$8.57	$5.71	'
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate	'	6.70%	'	'	'	6.60%
Unearned stock-based compensation	$21,700,000	'	'	$21,700,000	'	'
Weighted-average period over which the unearned stock-based compensation is expected to be recognized, years	'	'	'	'1 year 7 months 18 days	'	'
Stock-based compensation expense excluding acceleration of Veloce warrants	5,882,000	'	6,222,000	13,430,000	21,545,000	'
Stock-based compensation expense related to the acceleration of Veloce warrants	'	'	'	0	1,289,000	'
Veloce Technologies Inc [Member]	'	'	'	'	'	'
Stock Based Compensation (Textual) [Abstract]	'	'	'	'	'	'
Stock-based compensation expense related to the acceleration of Veloce warrants	'	'	'	$1,300,000	$1,300,000	'

Contingencies_Details

Contingencies (Details)	1 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2009	Dec. 31, 2013
		Amendments	Company
Contingencies (Textual) [Abstract]	'	'	'
Companies named as Potentially Responsible Parties (more than)	'	'	100
Amendments approved to consent decree	'	2	'
Percent of contribution to the total waste	0.50%	'	'

Sale_of_TPack_AS_Details

Sale of TPack A/S (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Apr. 22, 2013
					TPack [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Divestiture of Interest in Consolidated Subsidiaries, Sales Price	'	'	'	'	$33,500,000
Agreed upon price for sale of entity	'	'	'	'	34,000,000
Working capital adjustment to sale price	'	'	'	'	500,000
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]	'	'	'	'	'
Total proceeds, net of working capital adjustment	'	'	'	'	30,175,000
Net assets and liabilities	'	'	'	'	-184,000
Goodwill write off	'	'	'	'	-1,757,000
Intangibles write off	'	'	'	'	-11,404,000
Holdback amount	'	'	'	'	3,353,000
Legal fees and other costs	'	'	'	'	-484,000
Gain on sale of TPack	0	0	19,699,000	0	19,699,000
Cash, cash equivalents and short term investments	'	'	'	'	$700,000

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Jan. 22, 2014
Subsequent Event [Member]	'
Subsequent Event [Line Items]	'
Property held-for-sale, sale price	$40.80
Proceeds from nonrefundable cash deposit	$7