Income Taxes - Schedule of Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
US federal statutory tax rate	$ 278,535	$ 261,093	$ 205,578
State income taxes, net of federal income tax benefit		45,991	32,023
Other adjustments		(11,086)	(6,481)
Other foreign jurisdictions and Foreign rate differential		(13,078)	(15,976)
Gross unrecognized tax benefits		(1,594)	1,301
Intercompany transfers of assets		10,430	(1,817)
US tax on foreign earnings		(14,548)	4,750
Changes in net unrecognized tax benefits	11,728
Income Tax Expense (Benefit), Total	$ 302,285	$ 277,208	$ 219,378
Effective Income Tax Rate Reconciliation, Percent [Abstract]
US federal statutory tax rate	21.00%
Changes in net unrecognized tax benefits	0.90%
Effective income tax expense and rate	22.80%
Domestic
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
State income taxes, net of federal income tax benefit	$ 30,417
Foreign tax credits	(25,919)
Global intangible low-taxed income (commonly known as GILTI)	25,819
Foreign derived intangible income (commonly known as FDII)	(19,456)
Other	3,400
Tax credits	(1,700)
Changes in valuation allowances	(4,060)
Nontaxable or nondeductible items	7,862
Other adjustments	799
Effect of changes in tax laws or rates enacted in the current period	$ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
State income taxes, net of federal income tax benefit	2.30%
Foreign tax credits	(2.00%)
Global intangible low-taxed income (commonly known as GILTI)	1.90%
Foreign derived intangible income (commonly known as FDII)	(1.50%)
Other	0.30%
Tax credits	(0.10%)
Changes in valuation allowances	(0.30%)
Nontaxable or nondeductible items	0.60%
Other adjustments	0.10%
Effect of changes in tax laws or rates enacted in the current period	0.00%
Foreign
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Other foreign jurisdictions and Foreign rate differential	$ (5,140)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Other foreign jurisdictions	(0.40%)