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Employee Benefit Plans (Tables)
 12 Months Ended
Sep. 30, 2014
Compensation Related Costs [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table provides additional information related to the Performance Units granted in fiscal 2014, 2013 and 2012 and outstanding at September 30, 2014.
 
Grant Date
 
Vesting Date
 
Target Number of Performance Units
 
Grant Date Fair Value per Unit
 
Liability at September 30,
 
Compensation Expense
Year Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
(In millions)
 
(In millions)
November 2011
 
September 2014
 
350,000
 
$
11.79

 
$
11.7

 
$
7.4

 
$
4.3

 
$
3.3

 
$
4.1

November 2012
 
September 2015
 
350,000
 
22.15

 
4.9

 
2.7

 
2.2

 
2.7

 
—

November 2013
 
September 2016
 
350,000
 
19.64

 
2.6

 
—

 
2.6

 
—

 
—

 
 
 
 
 
 
 
 
$
19.2

 
$
10.1

 
$
9.1

 
$
6.0

 
$
4.1
Summarized information related to activity under the Company's Stock Incentive Plan
The following table provides additional information related to stock option activity under the Company’s Stock Incentive Plan.
 
Year Ended September 30,
 
2014
 
2013
 
2012
 
Stock Options
 
Weighted Average Exercise Price
 
Stock Options
 
Weighted Average Exercise Price
 
Stock Options
 
Weighted Average Exercise Price
Outstanding at beginning of year
18,962,536

 
$
15.91

 
17,580,031

 
$
14.24

 
22,705,963

 
$
13.63

Granted
3,856,166

 
23.85

 
3,676,000

 
23.80

 
—

 
—

Exercised
(2,687,724
)
 
16.30

 
(1,785,412
)
 
16.00

 
(4,493,797
)
 
11.13

Canceled or expired
(652,167
)
 
17.68

 
(508,083
)
 
14.66

 
(632,135
)
 
14.46

Outstanding at end of year
19,478,811

 
$
17.37

 
18,962,536

 
$
15.91

 
17,580,031

 
$
14.24

Exercisable at end of year
7,207,978

 
$
16.27

 
6,626,337

 
$
16.83

 
5,815,913

 
$
18.55
Weighted average assumptions of stock options
The fair values of the options granted were estimated on the date of their grant using the Black-Scholes option pricing model based on the following weighted average assumptions:
 
Year Ended September 30,
 
2014
 
2013
 
2012
Risk free interest rate
2.01%
 
1.13%
 
—
Expected life (in years)
6.48
 
6.46
 
—
Expected volatility
48.80%
 
49.30%
 
—
Expected dividend yield
0.63%
 
0.63%
 
—