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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Commitments And Contingencies Disclosure [Abstract]        
Beginning Balance $ 10,069 $ 10,585 $ 10,414 $ 11,721
Deductions [1] (5,721) (6,660) (11,380) (13,274)
Provision charged to expense 6,207 5,938 11,521 11,416
Ending Balance $ 10,555 $ 9,863 $ 10,555 $ 9,863
[1] Primarily claims paid during the year.