Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution postretirement benefit plan, costs recognized	$ 2,100,000	$ 2,200,000	$ 2,000,000.0
Profit-Sharing Retirement Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Contribution to the profit sharing retirement plan	$ 15,100,000	$ 14,200,000	$ 9,200,000

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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+ Details