Fair Value Measurements (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of beginning of period	$ 30,636,000	$ 61,725,000	$ 34,005,000	$ 60,796,000
Included in interest and other expense, net	(1,435,000)	(145,000)	(1,062,000)	(614,000)
Included in other comprehensive income	(1,210,000)	940,000	(552,000)	2,788,000
Sales and settlements, net	(950,000)	0	(5,350,000)	(450,000)
Balance as of end of period	27,041,000	62,520,000	27,041,000	62,520,000
Fair Value Measurements (Textuals) [Abstract]
Redemption of student loan auction rate securities	950,000		5,400,000	450,000
Loss included in interest and other expense asset-backed securities			$ 0