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Summary of Amounts of Interest and Penalties Recognized in Relation to Uncertain Tax Position (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2015 USD ($)
Income Tax Disclosure [Abstract]
Accrued interest recognized	$ (3,847)
Accrued penalties recognized	$ (6,475)

X

- Definition

Unrecognized tax benefits income tax penalties expense (benefit).

+ References

No definition available.

+ Details

Name:	exp_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpenseBenefit
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Unrecognized tax benefits interest on income taxes expense (benefit).

+ References

No definition available.

+ Details

Name:	exp_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpenseBenefit
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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