Income Taxes - Reconciliation Between U.S. Federal Statutory Tax Rate and Effective Tax Rate (Details)		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Reconciliation Between U.S. Federal Statutory Tax Rate and Effective Tax Rate
Provision for income taxes at U.S. federal statutory tax rate		21.00%	21.00%	21.00%
State and local taxes (net of federal tax benefit)		3.60%	3.40%	4.20%
Changes in unrecognized tax benefits		0.40%	0.50%	1.30%
Effect of state tax law changes		0.10%	(1.20%)	(0.30%)
State tax refund accrual (net of federal tax benefit)		(0.90%)	(0.60%)	(0.60%)
Other, net	[1]	(0.80%)	0.10%	(0.40%)
Effective tax rate		23.40%	23.20%	25.20%

[1] The amounts in Other, net include tax benefits from foreign tax credits and research and development credits for fiscal 2025, 2024, and 2023, and tax benefits from plug-in vehicle credits and qualified commercial clean vehicle credits for fiscal 2023.