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	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Revenue [Member]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 1,021	$ (10,656)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,494	(10,583)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	398	95
Cost Of Revenue [Member]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	3,937	8,943
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,910	10,232
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(349)	3,374
Selling, General And Administrative [Member]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(698)	(33)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	49	35
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 322	$ 51