Share-Based Compensation Plans (Information Related To Stock Appreciation Rights And Stock Options) (Details) (USD $)	12 Months Ended
	Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options and SARs, outstanding, number outstanding	2,653,430
Options and SARs, outstanding, weighted average remaining contractual life (in years)	2 years 9 months 18 days
Options and SARs, outstanding, weighted average exercise price	$ 24.07
Options and SARs, exercisable, number outstanding	1,756,862
Options and SARs, exercisable, weighted average remaining contractual life (in years)	1 year 6 months
Options and SARs, exercisable, weighted average exercise price	$ 30.15
$11.00-14.68 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower range limit	$ 11.00
Range of exercise prices, upper range limit	$ 14.68
Options and SARs, outstanding, number outstanding	1,161,224
Options and SARs, outstanding, weighted average remaining contractual life (in years)	4 years 9 months 18 days
Options and SARs, outstanding, weighted average exercise price	$ 12.20
Options and SARs, exercisable, number outstanding	274,362
Options and SARs, exercisable, weighted average remaining contractual life (in years)	3 years 1 month 6 days
Options and SARs, exercisable, weighted average exercise price	$ 12.45
$16.54-16.83 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower range limit	$ 16.54
Range of exercise prices, upper range limit	$ 16.83
Options and SARs, outstanding, number outstanding	121,706
Options and SARs, outstanding, weighted average remaining contractual life (in years)	4 years 6 months
Options and SARs, outstanding, weighted average exercise price	$ 16.81
Options and SARs, exercisable, number outstanding	112,000
Options and SARs, exercisable, weighted average remaining contractual life (in years)	4 years 4 months 24 days
Options and SARs, exercisable, weighted average exercise price	$ 16.83
$31.75-35.38 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, lower range limit	$ 31.75
Range of exercise prices, upper range limit	$ 35.38
Options and SARs, outstanding, number outstanding	1,370,500
Options and SARs, outstanding, weighted average remaining contractual life (in years)	1 year
Options and SARs, outstanding, weighted average exercise price	$ 34.78
Options and SARs, exercisable, number outstanding	1,370,500
Options and SARs, exercisable, weighted average remaining contractual life (in years)	1 year
Options and SARs, exercisable, weighted average exercise price	$ 34.78