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Contingencies and Other Accrued Losses - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018
Commitments And Contingencies Disclosure [Abstract] |  |
Environmental reserve for estimate of remediation costs |  | $ 1.7
Litigation settlement amount | $ 6.5 |

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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