Rollforward of Accrued Product Warranty Reserve (Details) - USD ($) $ in Thousands	9 Months Ended
	May. 31, 2015	May. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 4,056	$ 7,413
Provision for warranties	4,198	2,923
Warranty reserve of acquired business	0	(50)
Warranty payments and costs incurred	(3,505)	(5,311)
Impact of changes in foreign currency rates	(589)	30
Ending balance	$ 4,160	$ 5,105