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Accrued Loss Reserves (Detail) - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018
--- | --- | ---
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | $ 19,899 | $ 22,132
Accrued Loss Reserves - Noncurrent | 37,554 | 37,106
Accrued product liability reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 11,739 | 12,900
Accrued Loss Reserves - Noncurrent | 29,942 | 29,902
Accrued warranty reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 7,013 | 8,088
Accrued Loss Reserves - Noncurrent | 3,401 | 3,633
Accrued environmental reserves |  |
Schedule Of Accrued Liabilities [Line Items] |  |
Accrued losses | 1,147 | 1,144
Accrued Loss Reserves - Noncurrent | $ 4,211 | $ 3,571

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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=82911808&loc=d3e14326-108349 + Details
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