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Fair Value of Senior Notes (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Series 2005A Tranche C [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$ 57,399
Series 2007A Tranche C [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	24,005
Series 2007A Tranche D [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	38,609
4.5% Senior Unsecured Notes Due 2026 [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$ 365,190

X

- Definition

Fair value of financial instruments.

+ References

No definition available.

+ Details

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Namespace Prefix:	exp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_DebtInstrumentAxis=exp_SeriesTwoThousandSevenTrancheCMember
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Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=exp_SeriesTwoThousandSevenTrancheDMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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