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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization | $ (106,367) | $ (161,204)
Items Giving Rise to Deferred Tax Liabilities - Depletion | (11,069) | (18,638)
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net | (14,265) | (11,455)
Items Giving Rise to Deferred Tax Liabilities - Other | (5,957) | (8,515)
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities | (137,658) | (199,812)
Items Giving Rise to Deferred Tax Assets - Change in Accruals | 8,965 | 12,992
Items Giving Rise to Deferred Tax Assets - Inventory | 4,276 | 1,242
Items Giving Rise to Deferred Tax Assets - Bad Debts | 1,891 | 3,895
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan | 4,616 | 8,691
Items Giving Rise to Deferred Tax Assets - Credits and Other Carryforwards | 12,879 | 13,103
Items Giving Rise to Deferred Tax Assets - Pension | 1,108 | 4,178
Items Giving Rise to Deferred Tax Assets - Other |  | 218
Items Giving Rise to Deferred Tax Assets - Subtotal | 33,735 | 44,319
Items Giving Rise to Deferred Tax Assets - Valuation Allowance | (15,043) | (10,531)
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets | $ 18,692 | $ 33,788

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