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Pension and Employee Benefit Plans - Additional Information (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Compensation And Retirement Disclosure [Abstract]
Anticipated contributions to pension plans during fiscal third quarter	$ 8.5

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- Definition

Defined benefit plan expected future employer contributions next fiscal quarter.

+ References

No definition available.

+ Details

Name:	exp_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalQuarter
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration