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Share-based Compensation Share-based Compensation (Yearly Activity Of Stock Purchase Plan) (Details) (Employee Stock Purchase Plan [Member], USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subscribed	299,210	339,620	526,890
Price per share	$ 11.85	$ 14.34	$ 13.63
Shares purchased	198,300	357,180	980,940
Price per share	$ 11.76	$ 13.63	$ 7.94
Shares available for future issuance	4,342,704

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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