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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
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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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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