Fair Value Measurements (Tables)

12 Months Ended

Apr. 01, 2012

Fair Value Measurements [Abstract]

Schedule of Assets Measured at Fair Value of Debt Securities

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
	(In thousands)
April 1, 2012
Cash and cash equivalents	$	162,266	$	2,250	$	—	$	164,516
Marketable securities:
U.S. government and agency securities		141,859		—		—		141,859
Corporate debt obligations		—		167,668		—		167,668
Asset and mortgage-backed securities		—		46,594		—		46,594
Municipal bonds		—		16,568		—		16,568
Other debt securities		—		750		—		750
		141,859		231,580		—		373,439
	$	304,125	$	233,830	$	—	$	537,955
April 3, 2011
Cash and cash equivalents	$	146,281	$	1,499	$	—	$	147,780
Marketable securities:
U.S. government and agency securities		55,753		—		—		55,753
Corporate debt obligations		—		138,436		—		138,436
Asset and mortgage-backed securities		—		22,490		—		22,490
Municipal bonds		—		17,941		—		17,941
Non-U.S. government and agency securities		—		1,676		—		1,676
		55,753		180,543		—		236,296
	$	202,034	$	182,042	$	—	$	384,076

Summary of the changes in Level 3 assets measured at fair value on a recurring basis

Year Ended April 3, 2011	Balance March 28, 2010		Total Realized Gains (Losses)			Sales and Other Settlements			Balance April 3, 2011
	(In thousands)
Auction rate securities	$	22,317	$	1,483		$	(23,800	)	$	—
Put options related to auction rate securities		1,439		(1,439	)		—			—
	$	23,756	$	44		$	(23,800	)	$	—