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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Commitments And Contingencies Disclosure [Abstract]        
Beginning Balance $ 9,863 $ 14,457 $ 11,721 $ 19,149
Deductions [1] (4,283) (5,776) (17,557) (20,447)
Provision charged to expense 4,091 2,540 15,507 12,519
Ending Balance $ 9,671 $ 11,221 $ 9,671 $ 11,221
[1] Primarily claims paid during the year.