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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Supply Commitment [Line Items]
Revenue recognized related to shortfall provisions	$ 1.6
Minimum [Member]
Supply Commitment [Line Items]
Long-term supply agreements maturity year		2019
Revenue from contract with customer collection terms		30 days
Maximum [Member]
Supply Commitment [Line Items]
Long-term supply agreements maturity year		2025
Revenue from contract with customer collection terms		65 days

X

- Definition

Long-term supply agreements maturity year.

+ References

No definition available.

+ Details

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

X

- Definition

Revenue from contract with customer collection terms.

+ References

No definition available.

+ Details

Name:	exp_RevenueFromContractWithCustomerCollectionTerms
Namespace Prefix:	exp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue recognized related to shortfall provisions.

+ References

No definition available.

+ Details

Name:	exp_RevenueRecognizedRelatedToSortfallProvisions
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: