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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization | $ (108,505) | $ (106,367)
Items Giving Rise to Deferred Tax Liabilities - Depletion |  | (11,069)
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net | (9,236) | (14,265)
Items Giving Rise to Deferred Tax Liabilities - Other | (5,628) | (5,957)
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities | (123,369) | (137,658)
Items Giving Rise to Deferred Tax Assets - Change in Accruals | 8,601 | 8,965
Items Giving Rise to Deferred Tax Assets - Depletable Assets | 8,995 |
Items Giving Rise to Deferred Tax Assets - Inventory | 6,046 | 4,276
Items Giving Rise to Deferred Tax Assets - Bad Debts | 2,169 | 1,891
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan | 5,154 | 4,616
Items Giving Rise to Deferred Tax Assets - Credits and Other Carryforwards | 12,289 | 12,879
Items Giving Rise to Deferred Tax Assets - Pension | 921 | 1,108
Items Giving Rise to Deferred Tax Assets - Subtotal | 44,175 | 33,735
Items Giving Rise to Deferred Tax Assets - Valuation Allowance | (11,565) | (15,043)
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets | $ 32,610 | $ 18,692

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