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Schedule of Effective Tax Rates Vary from Federal Statutory Rates (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Earnings Before Income Taxes | $ 588,593 | $ 475,094 | $ 424,112
Income Taxes at Statutory Rate | 123,605 | 99,770 | 89,063
State Income Taxes, net | 16,821 | 12,743 | 11,713
Statutory Depletion in Excess of Cost | (8,253) | (7,796) | (5,263)
Excess Tax Benefit from Stock Compensation | (1,593) | (3,048) | (3,229)
Meals and Entertainment Disallowance | 484 | 279 | 220
Limitation on Officers' Compensation | 3,009 | 2,568 | 1,503
Valuation Allowance | (7,205) | (4,556) | 300
Change in Reserves | 0 | 0 | (2,916)
Other | 185 | 887 | (1,445)
Provision for Income Taxes | $ 127,053 | $ 100,847 | $ 89,946
Effective Tax Rate | 22.00% | 21.00% | 21.00%

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