Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Sep. 30, 2011 Year State Segment OperatingDivisions Market	Sep. 30, 2010 Year	Sep. 30, 2009 Year
Stock Options
Outstanding at beginning of year, shares	17,658,872	19,479,417	15,623,148
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.87	$ 14.31	$ 16.19
Granted, shares	6,172,500		6,115,000
Granted, Weighted Average Exercise Price	$ 9.97		$ 9.03
Exercised, shares	(303,535)	(1,234,396)	(665,357)
Exercised, Weighted Average Exercise Price	$ 8.36	$ 5.36	$ 4.90
Canceled or expired, shares	(821,874)	(586,149)	(1,593,374)
Canceled or expired, Weighted Average Exercise Price	$ 14.92	$ 16.27	$ 16.34
Outstanding at end of year, shares	22,705,963	17,658,872	19,479,417
Outstanding at end of year, Weighted Average Exercise Price	$ 13.63	$ 14.87	$ 14.31
Exercisable at end of year, shares	7,540,704	6,143,532	5,410,674
Exercisable at end of year, Weighted Average Exercise Price	$ 16.53	$ 16.76	$ 15.49
Assumptions used in Black-Scholes option valuation model
Risk free interest rate	1.26%	0.00%	2.50%
Expected life (in years)	6.46	0.00	7.74
Expected volatility	46.40%	0.00%	45.36%
Expected dividend yield	1.50%	0.00%	1.66%