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Amount Outstanding of Tranches - Two Thousand Five Note Purchase Agreement (Detail) (2005 Note Purchase Agreement [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Series 2005A Tranche B [Member]
 
Debt Instrument [Line Items]  
Principal $ 57.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheBMember
/ us-gaap_LongtermDebtTypeAxis
= exp_TwoThousandFiveNotePurchaseAgreementMember
Maturity Date Nov. 15, 2015
Interest Rate 5.38%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheBMember
/ us-gaap_LongtermDebtTypeAxis
= exp_TwoThousandFiveNotePurchaseAgreementMember
Series 2005A Tranche C [Member]
 
Debt Instrument [Line Items]  
Principal $ 57.2us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheCMember
/ us-gaap_LongtermDebtTypeAxis
= exp_TwoThousandFiveNotePurchaseAgreementMember
Maturity Date Nov. 15, 2017
Interest Rate 5.48%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheCMember
/ us-gaap_LongtermDebtTypeAxis
= exp_TwoThousandFiveNotePurchaseAgreementMember