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v3.19.3

Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Supply Commitment [Line Items] |  |
Revenue recognized related to shortfall provisions | $ 1.6 |
Minimum [Member] |  |
Supply Commitment [Line Items] |  |
Long-term supply agreements maturity year |  | 2019
Revenue from contract with customer collection terms |  | 30 days
Maximum [Member] |  |
Supply Commitment [Line Items] |  |
Long-term supply agreements maturity year |  | 2025
Revenue from contract with customer collection terms |  | 65 days

X
- Definition Long-term supply agreements maturity year. + References No definition available. + Details
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X
- Definition Revenue from contract with customer collection terms. + References No definition available. + Details
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Namespace Prefix: | exp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue recognized related to shortfall provisions. + References No definition available. + Details
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Balance Type: | credit
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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Balance Type: | na
Period Type: | duration

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

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