Increase decrease in bad debt reserve.

No definition available.

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

- Definition

Non cash charges and inventory write-offs.

+ References

No definition available.

+ Details

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

- Definition

Amount of non-cash income recognized upon the reduction of the prepaid sand liability.

+ References

No definition available.

+ Details

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

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

+ Details

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Balance Type:	debit
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- Definition

Costs incurred and are directly related to generating maintenance revenues. Also includes cost of maintenance on client contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=exp_FairbornAcquisitionMember
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Data Type:	na
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Period Type:

Quarterly Results (unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2017	Mar. 31, 2016
Effect Of Fourth Quarter Events [Line Items]
Impairment of Intangible Assets		$ 6,600	$ 28,400		$ 34,999
Non cash charges and inventory write-offs		4,100
Increase in bad debt reserve		1,000
Reduction of prepaid sand liability		$ 10,700		$ 2,000	$ 10,658
Fairborn Acquisition [Member]
Effect Of Fourth Quarter Events [Line Items]
Transaction related expenses	$ 4,400			$ 4,400
Annual maintenance costs	$ 5,000