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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