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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Letters of credit outstanding, amount | $ 9,900,000
Contingently liable for performance, current | 43,900,000
Outstanding guarantees | $ 0
Percentage of expected natural gas usage | 20.00%

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- Definition Contingent liability for performance bonds required by states municipalities and related agencies. + References No definition available. + Details
Name: | exp_ContingentLiabilityForPerformanceBondsRequiredByStatesMunicipalitiesAndRelatedAgencies
Namespace Prefix: | exp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of expected natural gas usage. + References No definition available. + Details
Name: | exp_PercentageOfExpectedNaturalGasUsage
Namespace Prefix: | exp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482050/460-10-25-4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant