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Accrued Loss Reserves (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016
--- | --- | ---
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | $ 31,735 | $ 35,290
Accrued loss reserves - Noncurrent | 33,417 | 34,898
Accrued product liability reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 14,932 | 25,100
Accrued loss reserves - Noncurrent | 28,222 | 29,045
Accrued warranty reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 15,701 | 9,137
Accrued loss reserves - Noncurrent | 3,448 | 4,177
Accrued environmental reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 1,102 | 1,053
Accrued loss reserves - Noncurrent | $ 1,747 | $ 1,676

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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