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Accrued Loss Reserves (Detail) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Schedule of Accrued Liabilities [Line Items]    
Accrued losses $ 22,132 $ 31,735
Accrued Loss Reserves - Noncurrent 37,106 33,417
Accrued product liability reserves    
Schedule of Accrued Liabilities [Line Items]    
Accrued losses 12,900 14,932
Accrued Loss Reserves - Noncurrent 29,902 28,222
Accrued warranty reserves    
Schedule of Accrued Liabilities [Line Items]    
Accrued losses 8,088 15,701
Accrued Loss Reserves - Noncurrent 3,633 3,448
Accrued environmental reserves    
Schedule of Accrued Liabilities [Line Items]    
Accrued losses 1,144 1,102
Accrued Loss Reserves - Noncurrent $ 3,571 $ 1,747