Derivative Financial Instruments And Hedging Activities (Impact Of Derivatives For Foreign Currency Risk And Designated As Hedging Instruments On AOCI And Earnings) (Details) (Forward Foreign Exchange Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 1,769	$ 31
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,165	364
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(53)	(107)
Cost Of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(2,598)	876
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1,175)	(131)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(1,395)	(162)
Selling, General And Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(2,315)	(58)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(2,147)	(24)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 83	$ (13)