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Accrued Loss Reserves (Detail) - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
--- | --- | ---
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | $ 20,021 | $ 19,899
Accrued Loss Reserves - Noncurrent | 34,654 | 37,554
Accrued product liability reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 10,458 | 11,739
Accrued Loss Reserves - Noncurrent | 27,016 | 29,942
Accrued warranty reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 7,593 | 7,013
Accrued Loss Reserves - Noncurrent | 3,513 | 3,401
Accrued environmental reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 1,970 | 1,147
Accrued Loss Reserves - Noncurrent | $ 4,125 | $ 4,211

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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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