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Schedule of Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
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