Summary of Stock Option and Stock Appreciation Right Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		12 Months Ended
	May 31, 2014		Aug. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Available for Grant, Beginning Balance	12,011,073
Shares Available for Grant, Options cancelled	2,312,274
Shares Available for Grant, Restricted stock awards granted	(3,615,405)	[1]
Shares Available for Grant, Ending Balance	10,707,942		12,011,073
Options Outstanding, beginning balance	7,857,127
Options Outstanding, options canceled	(2,312,274)
Options Outstanding, options exercised	(26,703)
Options Outstanding, ending balance	5,518,150		7,857,127
Options Outstanding, exercisable ending balance	5,518,150
Aggregate Intrinsic Value, beginning balance	$ 1,927
Aggregate Intrinsic Value, ending balance	286		1,927
Aggregate Intrinsic Value, Exercisable ending balance	$ 286
Weighted-Average Exercise Price, beginning balance	$ 26.31
Weighted-Average Exercise Price, options canceled	$ 26.37
Weighted-Average Exercise Price, options exercised	$ 19.25
Weighted-Average Exercise Price, ending balance	$ 26.33		$ 26.31
Weighted-Average Exercise Price, exercisable ending balance	$ 26.33
Weighted-Average Remaining Contractual Life	1 year 9 months 11 days		1 year 11 months 12 days
Weighted-Average Remaining Contractual Life, Exercisable ending balance	1 year 9 months 11 days

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