Accumulated Other Comprehensive Income (Loss) (Summary Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 3,252,228	$ 3,285,447	$ 1,132,487
Unrealized gain (loss) on available for sale debt securities of the Joint Venture			1,045
Realized gain (loss) on available for sale debt securities of the Joint Venture			(1,045)
Balance	3,276,107	3,252,228	3,285,447
Change associated with current period hedging, tax	7,347	1,033	607
Available For Sale Debt Security [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance
Unrealized gain (loss) on available for sale debt securities of the Joint Venture			1,045
Realized gain (loss) on available for sale debt securities of the Joint Venture			(1,045)
Balance
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	14,130	(7,084)	(1,565)
Change associated with foreign currency translation	3,741	21,324	(5,519)
Reclassification into earnings		(110)
Balance	17,871	14,130	(7,084)
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(2,909)	(288)	(1,691)
Change associated with current period hedging	18,216	(3,823)	981
Reclassification into earnings	1,938	1,202
Balance	17,245	(2,909)	(288)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	11,221	(7,372)	(3,256)
Unrealized gain (loss) on available for sale debt securities of the Joint Venture			1,045
Realized gain (loss) on available for sale debt securities of the Joint Venture			(1,045)
Change associated with foreign currency translation	3,741	21,324	(5,519)
Change associated with current period hedging	18,216	(3,823)	981
Reclassification into earnings	1,938	1,092
Balance	$ 35,116	$ 11,221	(7,372)
Cumulative Effect, Period of Adoption, Adjustment [Member] \| ASU 2018-02 [Member] \| Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			422
Cumulative Effect, Period of Adoption, Adjustment [Member] \| ASU 2018-02 [Member] \| Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			$ 422

Other Comprehensive Income (Loss), Securities, Available-for-Sale, Gain (Loss) Arising During Period, Net of Tax

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Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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