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Rollforward of Accrued Product Warranty Reserve (Details) - USD ($)
$ in Thousands
9 Months Ended
May 31, 2016
May 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 3,718 $ 4,056
Provision for warranties 3,225 4,198
Warranty reserve for acquired businesses 3 0
Warranty payments and costs incurred (3,155) (3,505)
Impact of changes in foreign currency rates (35) (589)
Ending balance $ 3,756 $ 4,160