Summary Of Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Mar. 31, 2011	Mar. 31, 2010
Summary Of Accounting Policies [Abstract]
Deferred purchase price receivable	$ 1,072,661,000	$ 254,083,000	$ 1,072,661,000	$ 254,083,000	$ 459,994,000	$ 135,401,000
Depreciation expense associated with property and equipment	105,000,000	97,800,000	207,800,000	191,300,000
Total intangible amortization expense	$ 14,500,000	$ 21,400,000	$ 27,800,000	$ 39,400,000