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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Commitments And Contingencies Disclosure [Abstract]      
Beginning Balance $ 10,414 $ 11,721 $ 19,149
Deductions [1] (20,762) (22,262) (26,199)
Provision charged to expense 21,454 20,955 17,924
Acquisitions     847
Ending Balance $ 11,106 $ 10,414 $ 11,721
[1] Primarily claims paid during the year.