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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization | $ (220,269) | $ (199,096)
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net | (21,923) | (12,225)
Items Giving Rise to Deferred Tax Liabilities - Depletable Assets | (3,540) |
Items Giving Rise to Deferred Tax Liabilities - Right of Use Assets | (6,271) | (5,441)
Items Giving Rise to Deferred Tax Liabilities - Other | (6,332) | (5,764)
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities | (258,335) | (222,526)
Items Giving Rise to Deferred Tax Assets - Change in Accruals | 12,046 | 9,373
Items Giving Rise to Deferred Tax Assets - Depletable Assets |  | 12,632
Items Giving Rise to Deferred Tax Assets - Inventory | 1,243 | 7,217
Items Giving Rise to Deferred Tax Assets - Bad Debts | 1,812 | 2,642
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan | 3,396 | 5,590
Items Giving Rise to Deferred Tax Assets - Credits and Other Carryforwards | 17,338 | 19,861
Items Giving Rise to Deferred Tax Assets - Lease Liability | 9,369 | 11,384
Items Giving Rise to Deferred Tax Assets - Pension | 906 | 937
Items Giving Rise to Deferred Tax Assets - Subtotal | 46,110 | 69,636
Items Giving Rise to Deferred Tax Assets - Valuation Allowance | (13,761) | (13,777)
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets | $ 32,349 | $ 55,859

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