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Net Interest Expense - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Interest Expense [Abstract]
Interest related to tax penalties	$ 4.4	$ 4.4

X

- Definition

Tax settlements, interest on penalties received.

+ References

No definition available.

+ Details

Name:	exp_TaxSettlementsInterestOnPenaltiesReceived
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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