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Accrued Loss Reserves (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
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Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | $ 27,487 | $ 27,591
Accrued loss reserves - Noncurrent | 32,232 | 33,502
Accrued product liability reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 10,589 | 15,582
Accrued loss reserves - Noncurrent | 29,653 | 29,489
Accrued warranty reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 14,167 | 8,591
Accrued loss reserves - Noncurrent | 574 | 739
Accrued environmental reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued loss reserves - Current | 2,731 | 3,418
Accrued loss reserves - Noncurrent | $ 2,005 | $ 3,274

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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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