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Schedule of Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
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