Derivative Financial Instruments And Hedging Activities (Impact Of Derivatives For Foreign Currency Risk And Not Designated As Hedging Instruments On Earnings) (Details) (Forward Foreign Exchange Contracts [Member], Cost Of Revenue [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Forward Foreign Exchange Contracts [Member] | Cost Of Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 2,815	$ 1,383