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Schedule of Components of Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization $ (157,260) $ (153,045)
Items Giving Rise to Deferred Tax Liabilities - Depletion (21,911) (18,374)
Items Giving Rise to Deferred Tax Liabilities - Repair Parts (2,446) (3,376)
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net (12,552) (13,708)
Items Giving Rise to Deferred Tax Liabilities - Other (4,147) (5,359)
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities (198,316) (193,862)
Items Giving Rise to Deferred Tax Assets - Accrual Changes 11,855 10,557
Items Giving Rise to Deferred Tax Assets - Bad Debts 3,604 2,264
Items Giving Rise to Deferred Tax Assets - Uniform Capitalization 2,174 835
Items Giving Rise to Deferred Tax Assets - Deferred Revenue 700 4,382
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan 11,458 8,318
Items Giving Rise to Deferred Tax Assets - Other 6,846 7,118
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets $ 36,637 $ 33,474