Treasury Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended	48 Months Ended
	Aug. 31, 2014	Sep. 30, 2010	Aug. 31, 2014
Disclosure Text Block Supplement [Abstract]
Stock Repurchase Program, Authorized Amount		$ 200.0	$ 44.0
Treasury Stock, Value, Acquired, Cost Method	0
Treasury Stock, Shares, Acquired		5,199,699
Treasury Stock Acquired, Average Cost Per Share		$ 30.00
Treasury Stock, Value, Acquired, Par Value Method		$ 156.0	$ 30.6