Product Warranty Costs (Rollforward Of Accrued Product Warranty Reserve) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Product Warranty Costs [Abstract]
Beginning balances	$ 23,707	$ 7,868
Purchase accounting adjustment	(5,719)
Provision for warranties	2,491	1,359
Warranty payments and costs incurred	(2,903)	(1,565)
Impact of changes in foreign currency rates	(1,109)	105
Ending balances	$ 16,467	$ 7,767