Fair Value Of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2012

Mar. 26, 2011

Fair Value Of Financial Instruments [Abstract]

Schedule Of Fair Value Of Financial Instruments

	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable
	Assets		Inputs		Inputs
Description	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds...........................................	$	40,557	$	—	$	—	$	40,557
Commercial paper...............................................		—		15,952		—		15,952
Corporate debt securities....................................		—		1,112		—		1,112
	$	40,557	$	17,064	$	—	$	57,621
Available-for-sale securities
Corporate debt securities....................................	$	—	$	48,025	$	—	$	48,025
U.S. Treasury securities.....................................		30,261		—		—		30,261
Agency discount notes........................................		—		16,796		—		16,796
Commercial paper...............................................		—		23,709		—		23,709
	$	30,261	$	88,530	$	—	$	118,791

	Quoted Prices
	in Active		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable
	Assets		Inputs		Inputs
Description	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds................................................	$	17,700	$	—	$	—	$	17,700
Commercial paper...................................................		—		4,999		—		4,999
U.S. Treasury securities...........................................		—		10,500		—		10,500
	$	17,700	$	15,499	$	—	$	33,199
Available-for-sale securities
Corporate debt securities.........................................	$	—	$	64,212	$	—	$	64,212
U.S. Treasury securities...........................................		35,281		—		—		35,281
Agency discount notes.............................................		—		16,591		—		16,591
Commercial paper...................................................		—		56,146		—		56,146
	$	35,281	$	136,949	$	—	$	172,230