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Income Taxes - Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Income Tax Disclosure [Abstract] |  |
Excess Tax Depreciation and Amortization | $ (256,999) | $ (260,577)
Depletable Assets | (4,455) | (4,294)
Investment in Joint Venture Basis Differences | (6,436) | (7,710)
Right-of-Use Assets | (7,996) | (4,774)
Inventory | (1,276) | 0
Other | 0 | (2,956)
Total Deferred Tax Liabilities | (277,162) | (280,311)
Change in Accruals | 12,866 | 13,313
Bad Debts | 1,551 | 1,621
Long-term Incentive Compensation Plan | 4,609 | 3,622
Credits and Other Carryforwards | 9,905 | 11,466
Lease Liability | 9,303 | 6,598
Inventory | 0 | 307
Pension | 984 | 1,087
Other | 1,002 | 0
Subtotal | 40,220 | 38,014
Valuation Allowance | (3,000) | (2,500)
Total Deferred Tax Assets | $ 37,220 | $ 35,514

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