Derivative Instruments and Hedging Activities (Details 2) (Derivatives Designated as Hedging Instruments, USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Aug. 31, 2012	Nov. 30, 2011
Derivative instruments and hedging activities
Fair Value of Liability Derivatives	$ 2,744	$ 2,846	$ 2,165
Foreign Currency Forward Contracts | Other Current Liabilities
Derivative instruments and hedging activities
Fair Value of Liability Derivatives	2	20	3
Interest Rate Contracts | Other Current Liabilities
Derivative instruments and hedging activities
Fair Value of Liability Derivatives	705	707	651
Interest Rate Contracts | Other Long-Term Liabilities
Derivative instruments and hedging activities
Fair Value of Liability Derivatives	$ 2,037	$ 2,119	$ 1,511