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Inventories - Additional Information (Details) $ in Millions | 6 Months Ended
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Sep. 30, 2019 USD ($)
Raw Materials and Materials-in-Process [Member] |
Inventory [Line Items] |
Inventory write-downs | $ 2.0
Frac Sand [Member] |
Inventory [Line Items] |
Inventory write-downs | $ 0.1

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- 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

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=exp_RawMaterialsAndMaterialsInProcessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=exp_FracSandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |