Consolidated Statements of Stockholders' Equity (USD $)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance, at Mar. 28, 2010	$ 4,000	$ (248,983,000)	$ 720,455,000	$ (198,626,000)	$ 1,282,000	$ 274,132,000
Balance, (in Shares) at Mar. 28, 2010	63,763,883	(19,924,369)
Net loss				(35,668,000)		(35,668,000)
Change in unrealized gains on marketable securities, including tax of					(1,569,000)	(1,569,000)
Shares issued through employee stock plans			1,208,000			1,208,000
Shares issued through employee stock plans (in Shares)	195,087					69,000
Shares issued in connection with Hifn acquisition			27,000			27,000
Shares issued in connection with Hifn acquisition (in Shares)	4,196
Shares issued for vested restricted stock units (in Shares)	619,561
Withholding of shares for tax obligations on vested restricted stock units			(969,000)			(969,000)
Withholding of shares for tax obligations on vested restricted stock units (in Shares)	(138,695)
Tax benefit from stock plans			37,000			37,000
Stock-based compensation			7,381,000			7,381,000
Balance, at Mar. 27, 2011	4,000	(248,983,000)	728,139,000	(234,294,000)	(287,000)	244,579,000
Balance, (in Shares) at Mar. 27, 2011	64,444,032	(19,924,369)
Net loss				(28,056,000)		(28,056,000)
Change in unrealized gains on marketable securities, including tax of					86,000	86,000
Shares issued through employee stock plans	1,000		3,144,000			3,145,000
Shares issued through employee stock plans (in Shares)	485,210					62,000
Shares issued in connection with Hifn acquisition			24,000			24,000
Shares issued in connection with Hifn acquisition (in Shares)	3,358
Shares issued for vested restricted stock units			16,000			16,000
Shares issued for vested restricted stock units (in Shares)	278,080
Withholding of shares for tax obligations on vested restricted stock units			(252,000)			(252,000)
Withholding of shares for tax obligations on vested restricted stock units (in Shares)	(41,078)
Stock-based compensation			3,750,000			3,750,000
Balance, at Apr. 01, 2012	5,000	(248,983,000)	734,821,000	(262,350,000)	(201,000)	223,292,000
Balance, (in Shares) at Apr. 01, 2012	65,169,602	(19,924,369)
Net loss				2,882,000		2,882,000
Change in unrealized gains on marketable securities, including tax of					(325,000)	(325,000)
Shares issued through employee stock plans			6,296,000			6,296,000
Shares issued through employee stock plans (in Shares)	903,772					26,000
Shares issued in connection with Hifn acquisition			3,740,000			3,740,000
Shares issued in connection with Hifn acquisition (in Shares)	357,873
Shares issued for vested restricted stock units (in Shares)	125,095
Withholding of shares for tax obligations on vested restricted stock units			(219,000)			(219,000)
Withholding of shares for tax obligations on vested restricted stock units (in Shares)	(24,727)
Stock-based compensation			4,788,000			4,788,000
Balance, at Mar. 31, 2013	$ 5,000	$ (248,983,000)	$ 749,426,000	$ (259,468,000)	$ (526,000)	$ 240,454,000
Balance, (in Shares) at Mar. 31, 2013	66,531,615	(19,924,369)