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Accrued Loss Reserves (Detail) - USD ($) $ in Thousands | May. 31, 2015 | May. 31, 2014
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Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | $ 22,016 | $ 27,487
Accrued loss reserves - Noncurrent | 36,213 | 32,232
Accrued product liability reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 11,916 | 10,589
Accrued loss reserves - Noncurrent | 29,769 | 29,653
Accrued warranty reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 8,718 | 14,167
Accrued loss reserves - Noncurrent | 2,945 | 574
Accrued environmental reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 1,382 | 2,731
Accrued loss reserves - Noncurrent | $ 3,499 | $ 2,005

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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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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond 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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