Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Components of comprehensive income
Net income	$ 127,014	$ 152,341	$ 407,674	$ 481,823
Net change in unrealized gains (losses) on available-for-sale securities, net of tax	(436)	(344)	3,822	4,381
Reclassification adjustment for gains (losses) on available-for-sale securities, net of tax, included in net income	(425)	169	(987)	(2,280)
Net change in unrealized gain (loss) on hedging transactions, net of tax	(3,413)	(1,585)	(12,132)	5,903
Net change in cumulative translation adjustment	(2,053)	819	(1,177)	682
Comprehensive income	$ 120,687	$ 151,400	$ 397,200	$ 490,509