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Fair Value of Senior Notes (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
2.500% Senior Unsecured Notes Due 2031 [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of long term debt	$ 739,479

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- Definition

Fair value of financial instruments.

+ References

No definition available.

+ Details

Name:	exp_FairValueOfFinancialInstrumentsLineItems
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

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

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- Details

Name:	us-gaap_LongtermDebtTypeAxis=exp_TwoPointFiveZeroZeroPercentageSeniorUnsecuredNotesDueTwoThousandThirtyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: