Summary of Stock Option, Stock Appreciation Right and Restricted Stock Award Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	May 31, 2012 Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, beginning balance	9,164,425
Shares Available for Grant, Options Cancelled	477,867
Shares Available for Grant, Options expired	(53,274)
Shares Available for Grant, Restricted stock awards granted	(4,837,763)	[1]
Shares Available for Grant, ending balance	4,751,255
Options Outstanding, beginning balance	10,473,033
Options Outstanding, options cancelled	(477,867)
Options Outstanding, options exercised	(1,169,662)
Options Outstanding, ending balance	8,825,504
Options Outstanding, exercisable ending balance	8,806,343
Aggregate Intrinsic Value, beginning balance	$ 4,029
Aggregate Intrinsic Value, ending balance	2,381
Aggregate Intrinsic Value, Exercisable ending balance	$ 2,260
Weighted-Average Exercise Price, beginning balance	$ 24.76
Weighted-Average Exercise Price, options cancelled	$ 26.52
Weighted-Average Exercise Price, options expired	$ 15.23
Weighted-Average Exercise Price, options exercised	$ 16.79
Weighted-Average Exercise Price, ending balance	$ 25.79
Weighted-Average Exercise Price, exercisable ending balance	$ 25.81
Weighted-Average Remaining Contractual Life, beginning balance	3.70
Weighted-Average Remaining Contractual Life, ending balance	3.14
Weighted-Average Remaining Contractual Life, Exercisable ending balance	3 years 48 days

[1] Represents the maximum number of shares that can be issued based on the achievement of certain performance criteria.