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Computation of Earnings Per Share - Additional Information (Detail) - shares | 3 Months Ended | 9 Months Ended
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Dec. 31, 2019 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |
Shares excluded due to anti-dilution effects | 0 | 0
Anti dilutive securities to be considered dilutive securities | 301,206 | 281,031

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- Definition Anti dilutive Securities would have been considered dilutive if not for the net loss position. + References No definition available. + Details
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Namespace Prefix: | exp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration