Summary of Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2014		Aug. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares Available for Grant, Beginning Balance	12,011,073
Shares Available for Grant, Options canceled	2,398,422
Shares Available for Grant, Restricted stock awards granted	(3,585,849)	[1]
Shares Available for Grant, Ending Balance	10,823,646		12,011,073
Options Outstanding, beginning balance	7,857,127
Options Outstanding, options canceled	(2,398,422)
Options Outstanding, options exercised	(26,703)
Options Outstanding, ending balance	5,432,002		7,857,127
Options Outstanding, exercisable ending balance	5,432,002
Aggregate Intrinsic Value, beginning balance	$ 1,927
Aggregate Intrinsic Value, ending balance	400		1,927
Aggregate Intrinsic Value, Exercisable ending balance	$ 400
Weighted-Average Exercise Price, beginning balance	$ 26.31
Weighted-Average Exercise Price, options canceled	$ 26.38
Weighted-Average Exercise Price, options exercised	$ 19.25
Weighted-Average Exercise Price, ending balance	$ 26.32		$ 26.31
Weighted-Average Exercise Price, exercisable ending balance	$ 26.32
Weighted-Average Remaining Contractual Life	1 year 6 months 7 days		1 year 11 months 12 days
Weighted-Average Remaining Contractual Life, Exercisable ending balance	1 year 6 months 7 days

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