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Pending Acquisition - Additional Information (Detail) - Cemex Construction Materials Atlantic, LLC [Member] - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2016	Sep. 11, 2016
Business Acquisition [Line Items]
Asset purchase agreement date	Sep. 11, 2016
Purchase price to be paid for business acquisition		$ 400.0

X

- Definition

Business combination aggregate purchase price to be paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: