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Revenue - Additional Information (Detail)	9 Months Ended
	Dec. 31, 2024
Minimum [Member]
Supply Commitment [Line Items]
Revenue from contract with customer collection terms	30 days
Long term supply agreements term of termination notice period	2 years
Maximum [Member]
Supply Commitment [Line Items]
Revenue from contract with customer collection terms	75 days
Long term supply agreements term of termination notice period	3 years

X

- Definition

Long term supply agreements term of termination notice period.

+ References

No definition available.

+ Details

Name:	exp_LongTermSupplyAgreementsTermOfTerminationNoticePeriod
Namespace Prefix:	exp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

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

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

Name:	us-gaap_SupplyCommitmentLineItems
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: