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Warranty - Reconciliation of Accrued Warranty (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2016
May 31, 2016
Aug. 31, 2015
Guarantees [Abstract]          
Balance at the beginning of the period $ 7,317 $ 6,911      
Accruals for warranties 1,848 1,545      
Settlements made during the period (1,548) (1,574)      
Balance at the end of the period 7,617 6,882      
Accrued warranty $ 7,617 $ 6,882 $ 7,617 $ 7,317 $ 6,882
Non-current balance     2,500 2,500 2,400
Accrued warranty     $ 5,117 $ 4,817 $ 4,482