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Fair Value of Senior Notes (Parenthetical) (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member]	6 Months Ended
	Sep. 30, 2018	Aug. 02, 2016
Fair Value Of Financial Instruments [Line Items]
Debt instrument, interest rate	4.50%	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://fasb.org/us-gaap/role/ref/legacyRef
-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_FourPointFiveZeroZeroPercentageSeniorUnsecuredNotesDueTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: