Summary Of Accounting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Summary Of Accounting Policies [Abstract]
Balance at Beginning of Year	$ 13,388,000	[1],[2]	$ 13,163,000		$ 29,020,000
Charged to Costs and Expenses	30,330,000	[1],[2]	4,043,000		44,066,000
Deductions/Write-offs	(4,439,000)	[1],[2]	(3,818,000)		(59,923,000)
Balance at End of Year	39,279,000	[1],[2]	13,388,000	[1],[2]	13,163,000
Reclassification of accounts receivable	3,900,000
Provision for accounts receivable related to a distressed customer	$ 28,000,000

[1] Deductions/write-offs amount for fiscal year 2012 includes $3.9 million, which was previously reservedand the underlying accounts receivable balance wasreclassified to non-current assets in fiscal year 2012, which is carried net of its specific reserve.

[2] Included in amounts charged to costs and expenses in fiscal 2012 is an amount of $28.0 million related to a distressed customer. Refer to note 19 "Subsequent Event" for further details.