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Income Taxes - Schedule of Effective Tax Rates Vary from Federal Statutory Rates (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Earnings Before Income Taxes | $ 591,485 | $ 617,937 | $ 588,593
Income Taxes at Statutory Rate | 124,212 | 129,766 | 123,605
State Income Taxes, net | 14,680 | 18,172 | 16,821
Statutory Depletion in Excess of Cost | (9,927) | (9,883) | (8,253)
Excess Tax Benefit from Stock Compensation | (3,951) | (5,417) | (1,593)
Meals and Entertainment Disallowance | 478 | 524 | 484
Limitation on Officers' Compensation | 4,843 | 6,513 | 3,009
Valuation Allowance | 500 | 500 | (7,205)
Other | (2,766) | 123 | 185
Provision for Income Taxes | $ 128,069 | $ 140,298 | $ 127,053
Effective Tax Rate | 22.00% | 23.00% | 22.00%

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