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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Commitments And Contingencies Disclosure [Abstract]    
Beginning Balance $ 19,149 $ 13,314
Deductions [1] (8,642) (2,490)
Provision charged to expense 5,264 4,409
Ending Balance $ 15,771 $ 15,233
[1] Primarily claims paid during the year.