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Stock Based Compensation - Additional Information (Detail) (Restricted Stock And Restricted Stock Unit, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Restricted Stock And Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	$ 2.0	$ 3.2	$ 4.8	$ 6.7

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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