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Warranty Accruals - Warranty Accruals Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Product Liability Contingency [Line Items]    
Balance at beginning of period $ 27,395 $ 20,737
Charged to cost of revenue, net 1,441 1,953
Payments (2,184) (751)
Currency translation effect (388) 13
Balance at end of period $ 26,264 $ 21,952