Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Current
U.S. Federal	$ 229,234	$ 354,569	$ 232,844
State and local	116,751	86,947	26,333
Foreign	2,635	9,120	8,486
Total current	348,620	450,636	267,663
Deferred
U.S. Federal	(94,321)	(300,494)	(146,581)
State and local	(5,990)	(50,318)	11,781
Foreign	(695)	(3,090)	4,603
Total deferred	(101,006)	(353,902)	(130,197)
Total	$ 247,614	$ 96,734	$ 137,466

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