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Share-Based Compensation (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 30, 2011 Year	Nov. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	$ 3.9	$ 2.1
Pre tax compensation cost, total	$ 38.3
Unrecognized Pre tax compensation cost	3
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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