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Pending Acquisition - Additional Information (Detail) - Cemex Construction Materials Atlantic, LLC [Member] - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Sep. 11, 2016
Business Acquisition [Line Items] |  |
Asset purchase agreement date | Sep. 11, 2016 |
Purchase price to be paid for business acquisition |  | $ 400.0
Transaction related expenses |  | $ 4.0

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- Definition Business combination aggregate purchase price to be paid. + References No definition available. + Details
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Namespace Prefix: | exp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |