XML 78 R64.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Fair Value of Senior Notes (Parenthetical) (Detail) - 4.5% Senior Unsecured Notes Due 2026 [Member] | 9 Months Ended
--- | ---
Dec. 31, 2016
Fair Value Of Financial Instruments [Line Items] |
Debt instrument, interest rate | 4.50%
Debt instrument, maturity year | 2026

X
- Definition Debt instrument maturity year. + References No definition available. + Details
Name: | exp_DebtInstrumentMaturityYear
Namespace Prefix: | exp_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial instruments. + References No definition available. + Details
Name: | exp_FairValueOfFinancialInstrumentsLineItems
Namespace Prefix: | exp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=exp_FourPointFivePercentageSeniorUnsecuredNotesDueTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |