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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Commitments And Contingencies Disclosure [Abstract]        
Beginning Balance $ 10,585 $ 15,771 $ 11,721 $ 19,149
Deductions [1] (6,660) (6,030) (13,274) (14,671)
Provision charged to expense 5,938 4,716 11,416 9,979
Ending Balance $ 9,863 $ 14,457 $ 9,863 $ 14,457
[1] Primarily claims paid during the year.