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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Commitments And Contingencies Disclosure [Abstract]    
Beginning Balance $ 11,721 $ 19,149
Deductions [1] (6,614) (8,642)
Provision charged to expense 5,478 5,264
Ending Balance $ 10,585 $ 15,771
[1] Primarily claims paid during the year.