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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
Commitments And Contingencies Disclosure [Abstract]        
Beginning Balance $ 15,771 $ 15,233 $ 19,149 $ 13,314
Deductions [1] (6,030) (5,942) (14,671) (8,432)
Provision charged to expense 4,716 6,663 9,979 11,072
Ending Balance $ 14,457 $ 15,954 $ 14,457 $ 15,954
[1] Primarily claims paid during the year.