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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization | $ (199,096) | $ (108,505)
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net | (12,225) | (9,236)
Items Giving Rise to Deferred Tax Liabilities - Right of Use Asset | (5,441) |
Items Giving Rise to Deferred Tax Liabilities - Other | (5,764) | (5,628)
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities | (222,526) | (123,369)
Items Giving Rise to Deferred Tax Assets - Change in Accruals | 9,373 | 8,601
Items Giving Rise to Deferred Tax Assets - Depletable Assets | 12,632 | 8,995
Items Giving Rise to Deferred Tax Assets - Inventory | 7,217 | 6,046
Items Giving Rise to Deferred Tax Assets - Bad Debts | 2,642 | 2,169
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan | 5,590 | 5,154
Items Giving Rise to Deferred Tax Assets - Credits and Other Carryforwards | 19,861 | 12,289
Items Giving Rise to Deferred Tax Assets - Lease Liability | 11,384 |
Items Giving Rise to Deferred Tax Assets - Pension | 937 | 921
Items Giving Rise to Deferred Tax Assets - Subtotal | 69,636 | 44,175
Items Giving Rise to Deferred Tax Assets - Valuation Allowance | (13,777) | (11,565)
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets | $ 55,859 | $ 32,610

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