Consolidated Statements Of Stockholders Equity And Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at Mar. 29, 2009	$ 292,094	$ 4	$ (248,983)	$ 710,787	$ (170,516)	$ 802
Balance, Shares at Mar. 29, 2009		62,960,640	(19,924,369)
Comprehensive loss:
Net loss	(28,110)				(28,110)
Other comprehensive income (loss):
Change in unrealized gains on marketable securities, including tax of $289, $0 and $52 for the year ended 2010, 2011 and 2012, respectively	480					480
Total comprehensive loss	(27,630)
Shares issued through employee stock plans	538			538
Shares issued through employee stock plans, Shares		83,553
Shares issued in connection with Hifn acquisition	2,709			2,709
Shares issued in connection with Hifn acquisition, Shares		418,026
Deferred salary option adjustment, net	20			20
Deferred salary option adjustment, net, Shares		1,325
Shares issued for vested restricted stock units	3			3
Shares issued for vested restricted stock units, Shares		349,409
Withholding of shares for tax obligations on vested restricted stock units	(347)			(347)
Withholding of shares for tax obligations on vested restricted stock units, Shares		(49,070)
Tax benefit from stock plans	780			780
Stock-based compensation	5,965			5,965
Balance at Mar. 28, 2010	274,132	4	(248,983)	720,455	(198,626)	1,282
Balance, Shares at Mar. 28, 2010		63,763,883	(19,924,369)
Comprehensive loss:
Net loss	(35,668)				(35,668)
Other comprehensive income (loss):
Change in unrealized gains on marketable securities, including tax of $289, $0 and $52 for the year ended 2010, 2011 and 2012, respectively	(1,569)					(1,569)
Total comprehensive loss	(37,237)
Shares issued through employee stock plans	1,208			1,208
Shares issued through employee stock plans, Shares		195,087
Shares issued in connection with Hifn acquisition	27			27
Shares issued in connection with Hifn acquisition, Shares		4,196
Shares issued for vested restricted stock units, Shares		619,561
Withholding of shares for tax obligations on vested restricted stock units	(969)			(969)
Withholding of shares for tax obligations on vested restricted stock units, Shares		(138,695)
Tax benefit from stock plans	37			37
Stock-based compensation	7,381			7,381
Balance at Mar. 27, 2011	244,579	4	(248,983)	728,139	(234,294)	(287)
Balance, Shares at Mar. 27, 2011		64,444,032	(19,924,369)
Comprehensive loss:
Net loss	(28,797)				(28,797)
Other comprehensive income (loss):
Change in unrealized gains on marketable securities, including tax of $289, $0 and $52 for the year ended 2010, 2011 and 2012, respectively	86					86
Total comprehensive loss	(28,711)
Shares issued through employee stock plans	3,145	1		3,144
Shares issued through employee stock plans, Shares		485,210
Shares issued in connection with Hifn acquisition	24			24
Shares issued in connection with Hifn acquisition, Shares		3,358
Shares issued for vested restricted stock units	16			16
Shares issued for vested restricted stock units, Shares		278,080
Withholding of shares for tax obligations on vested restricted stock units	(252)			(252)
Withholding of shares for tax obligations on vested restricted stock units, Shares		(41,078)
Stock-based compensation	4,491			4,491
Balance at Apr. 01, 2012	$ 223,292	$ 5	$ (248,983)	$ 735,562	$ (263,091)	$ (201)
Balance, Shares at Apr. 01, 2012		65,169,602	(19,924,369)