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Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Abstract]
Revenues recognized under ASC 606	$ 734,993	$ 714,402	$ 746,406
Revenues [Abstract]
Total revenues	5,828,665	5,625,674	5,864,691
Revenues recognized under ASC 842
Revenues [Abstract]
Total revenues	4,753,584	4,575,486	4,744,746
Revenues recognized under ASC 944
Revenues [Abstract]
Total revenues	188,114	189,318	196,860
Revenues recognized under ASC 320
Revenues [Abstract]
Total revenues	151,974	146,468	176,679
Revenues recognized over time
Disaggregation of Revenue [Abstract]
Revenues recognized under ASC 606	344,401	312,659	320,822
Revenues recognized at a point in time
Disaggregation of Revenue [Abstract]
Revenues recognized under ASC 606	$ 390,592	$ 401,743	$ 425,584

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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