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Income Taxes - Reconciliation of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income tax expense computed at U.S. federal statutory rate	$ 179,197	$ 77,269	$ 126,981
Increases (reductions) resulting from:
State and local income taxes, net of federal tax	85,486	32,599	28,762
Foreign income taxes, net of federal tax	(7,932)	4,765	9,243
Non-deductible expenses, including non-deductible penalties	4,867	34,825	859
Excess tax benefits from stock-based compensation	(10,091)	(5,247)	(4,227)
Research and development and other federal credits	(31,289)	(33,159)	(34,080)
Executive compensation -162(m)	6,307	4,295	3,614
Foreign-Derived Intangible Income (FDII)	(13,971)	(15,869)	(9,115)
Changes in uncertain tax positions (including indirect effects)	37,592	(6,498)	16,938
Other	(2,552)	3,754	(1,509)
Total	$ 247,614	$ 96,734	$ 137,466

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Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation Cost, Amount

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Amount of reported income tax benefit from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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