Income Taxes (Schedule Of Reconciliation Of The Income Tax Expense (Benefit) Expected Based On Domestic Statutory Income Tax Rates To The Expense (Benefit) For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Income taxes based on domestic statutory rates	$ 96,014	$ 106,852	$ (1,852)
Effect of tax rate differential	(177,540)	26,459	(42,106)
Intangible amortization	9,502	12,055	15,279
Change in liability for uncertain tax positions	34,517	(29,205)	(80,175)
Change in valuation allowance	93,336	(90,033)	69,076
Other	(1,713)	(3,952)	4,030
Provision for income taxes	$ 54,116	$ 22,176	$ (35,748)

Income Taxes (Schedule Of Reconciliation Of The Income Tax Expense (Benefit) Expected Based On Domestic Statutory Income Tax Rates To The Expense (Benefit) For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Mar. 31, 2012

Mar. 31, 2011

Mar. 31, 2010

Income Taxes [Abstract]

Income taxes based on domestic statutory rates

$ 96,014

$ 106,852

$ (1,852)

Effect of tax rate differential

(177,540)

26,459

(42,106)

Intangible amortization

9,502

12,055

15,279

Change in liability for uncertain tax positions

34,517

(29,205)

(80,175)

Change in valuation allowance

93,336

(90,033)

69,076

Other

(1,713)

(3,952)

4,030

Provision for income taxes

$ 54,116

$ 22,176

$ (35,748)

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