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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Commitments And Contingencies Disclosure [Abstract]    
Beginning Balance $ 13,175 $ 11,106
Deductions [1] (6,258) (5,930)
Provision charged to expense 6,115 7,660
Ending Balance $ 13,032 $ 12,836
[1] Primarily claims paid during the year.