Share-Based Compensation (Shares Subject to Options and SARs Excluding the Cash Component) (Details) (USD $)	9 Months Ended
	May 31, 2012 Y
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options and SARs, outstanding, number outstanding, beginning balance	2,807,498
Options and SARs, granted, number	828,463
Options and SARs, exercised, number	(80,210)
Options and SARs, forfeited / expired, number	(213,566)
Options and SARs, outstanding, number outstanding, ending balance	3,342,185
Options and SARs, exercisable, number outstanding	2,477,927
Options and SARs, outstanding, weighted average exercise price, beginning balance	$ 27.45
Options and SARs, granted, weighted average exercise price	$ 11.63
Options and SARs, exercised, weighted average exercise price	$ 12.43
Options and SARs, forfeited / expired, weighted average exercise price	$ 30.36
Options and SARs, outstanding, weighted average exercise price, ending balance	$ 23.71
Options and SARs, exercisable, weighted average exercise price	$ 27.82
Options and SARs, outstanding, weighted average remaining contractual life (years)	3.2
Options and SARs, exercisable, weighted average remaining contractual life (years)	2.1