Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Stock Options
Outstanding at beginning of year, shares	18,962,536	17,580,031	22,705,963
Granted, shares	3,856,166	3,676,000	0
Exercised, shares	(2,687,724)	(1,785,412)	(4,493,797)
Canceled or expired, shares	(652,167)	(508,083)	(632,135)
Outstanding at end of year, shares	19,478,811	18,962,536	17,580,031
Exercisable at end of year, shares	7,207,978	6,626,337	5,815,913
Outstanding at beginning of year, weighted average exercise price, per share	$ 15.91	$ 14.24	$ 13.63
Granted, weighted average exercise price, per share	$ 23.85	$ 23.80	$ 0.00
Exercised, weighted average exercise price, per share	$ 16.30	$ 16.00	$ 11.13
Canceled or expired, weighted average exercise price, per share	$ 17.68	$ 14.66	$ 14.46
Outstanding at end of year, weighted average exercise price, per share	$ 17.37	$ 15.91	$ 14.24
Exercisable at end of year, weighted average exercise price, per share	$ 16.27	$ 16.83	$ 18.55
Assumptions used in Black-Scholes option valuation model
Risk free interest rate	2.01%	1.13%
Expected life (in years)	6 years 5 months 22 days	6 years 5 months 15 days
Expected volatility	48.80%	49.30%
Expected dividend yield	0.63%	0.63%