Share-based Payments (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Compensation expense
Recognized compensation expense	$ 27,400,000	$ 19,700,000
Unrecognized compensation expense	66,800,000		39,000,000
Stock options, Weighted Average Exercise Price
Excess tax benefit from share-based payments	1,754,000	1,133,000
Stock options
Stock options, Shares of stock under options
Outstanding at the beginning of the period (in shares)	2.5	2.9
Options exercised (in shares)	(0.6)	(0.3)
Options forfeited or expired (in shares)	(0.2)
Outstanding at the end of the period (in shares)	1.7	2.6
Vested and expected to vest in the future at the end of the period (in shares)	1.7	2.5
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 22.81	$ 21.38
Options Exercised (in dollars per share)	$ 17.55	$ 11.20
Options forfeited or expired (in dollars per share)	$ 26.95	$ 26.52
Outstanding at the end of the period (in dollars per share)	$ 24.32	$ 22.63
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 24.32	$ 22.59
Excess tax benefit from share-based payments	$ 1,800,000	$ 1,100,000
Performance Earnings Program
Compensation expense
Performance period over which objectives must be met to qualify for an award grant, one	2 years
Performance period over which objectives must be met to qualify for an award grant, two	3 years