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Schedule of Components of Deferred Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Items Giving Rise to Deferred Tax Liabilities - Excess Tax Depreciation and Amortization $ (153,045)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (144,519)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Items Giving Rise to Deferred Tax Liabilities - Depletion (18,374)exp_DeferredTaxLiabilitiesDepletion (100)exp_DeferredTaxLiabilitiesDepletion
Items Giving Rise to Deferred Tax Liabilities - Repair Parts (3,376)exp_DeferredTaxLiabilitiesDeferredExpenseDeferredRepairCharges (4,545)exp_DeferredTaxLiabilitiesDeferredExpenseDeferredRepairCharges
Items Giving Rise to Deferred Tax Liabilities - State Income Taxes, net (13,708)exp_DeferredTaxLiabilitiesStateIncomeTaxes (7,648)exp_DeferredTaxLiabilitiesStateIncomeTaxes
Items Giving Rise to Deferred Tax Liabilities - Other (5,359)us-gaap_DeferredTaxLiabilitiesOther (9,125)us-gaap_DeferredTaxLiabilitiesOther
Items Giving Rise to Deferred Tax Liabilities - Total Deferred Tax Liabilities (193,862)us-gaap_DeferredIncomeTaxLiabilities (165,937)us-gaap_DeferredIncomeTaxLiabilities
Items Giving Rise to Deferred Tax Assets - Accrual Changes 10,557us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 9,946us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Items Giving Rise to Deferred Tax Assets - Bad Debts 2,264us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,122us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Items Giving Rise to Deferred Tax Assets - Uniform Capitalization 835us-gaap_DeferredTaxAssetsInventory 2,131us-gaap_DeferredTaxAssetsInventory
Items Giving Rise to Deferred Tax Assets - Deferred Revenue 4,382us-gaap_DeferredTaxAssetsDeferredIncome  
Items Giving Rise to Deferred Tax Assets - Long-term Incentive Compensation Plan 8,318us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 6,526us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Items Giving Rise to Deferred Tax Assets - Other 7,118us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther  
Items Giving Rise to Deferred Tax Assets - Total Deferred Tax Assets $ 33,474us-gaap_DeferredTaxAssetsNet $ 20,725us-gaap_DeferredTaxAssetsNet