Employee Benefit Plans (Details) - SIP Activity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013
Employee Benefit Plans
Shares Outstanding (in shares)	12,117
Weighted Average Exercise Price Outstanding (in Dollars per share)	$ 18.12
Weighted Average Remaining Contractual Term Outstanding	5 years 2 months 12 days
Vested and expected to vest (in shares)	8,966
Vested and expected to vest (in Dollars per share)	$ 18.60
Vested and expected to vest	5 years 2 months 12 days
Vested and expected to vest (in Dollars)	$ 23.1
Exercisable at end of period (in shares)	6,823
Exercisable at end of period (in Dollars per share)	$ 19.24
Exercisable at end of period	4 years 7 months 6 days
Exercisable at end of period (in Dollars)	17.3
Granted (in shares)	0
Granted (in Dollars per share)	$ 0
Exercised (in shares)	(1,719)
Exercised (in Dollars per share)	$ 14.59
Forfeited (in shares)	(382)
Forfeited (in Dollars per share)	$ 16.65
Expired (in shares)	(928)
Expired (in Dollars per share)	$ 20.90
Shares Outstanding (in shares)	9,088
Weighted Average Exercise Price Outstanding (in Dollars per share)	$ 18.57
Weighted Average Remaining Contractual Term Outstanding	5 years 2 months 12 days
Aggregate Intrinsic Value Outstanding (in Dollars)	$ 23.4