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Stock-Based Compensation (Tables)
 3 Months Ended
Dec. 31, 2013
Stock-Based Compensation [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following is a summary of stock option activity for the three months ended December 31, 2013:
 
Shares
Available for
Grant
 
Number of
Options
Outstanding
 
Weighted
Average Price
 
Weighted
Average
Grant Date
Fair Value
 
Weighted
Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic
Value
($ millions)
Balances as of September 30, 2013
1,000,000

 
1,779,983

 
$
24.76

 
$
11.44

 
4.87
 
$
4.8

Granted
—

 
—

 
$
—

 
$
—

 
 
 
 
Exercised
 
 
(44,920
)
 
$
12.05

 
$
6.22

 
 
 
 
Forfeited
—

 
—

 
$
—

 
$
—

 
 
 
 
Expired
—

 
(32,647
)
 
$
50.64

 
$
14.27

 
 
 
 
Balances as of December 31, 2013
1,000,000

 
1,702,416

 
$
24.60

 
$
11.52

 
4.81
 
$
3.3

Exercisable as of December 31, 2013
 
 
761,103

 
$
23.91

 
$
9.75

 
1.73
 
$
3.3
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following is a summary of restricted stock activity for the three months ended December 31, 2013:
 
Shares
Available for
Grant
 
Number of
Shares
Outstanding
 
Weighted
Average
Grant Date
Fair Value
 
Weighted
Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic
Value
($ millions)
Balances as of September 30, 2013
1,154,862

 
363,638

 
$
20.53

 
1.74
 
$
7.4

Granted
(47,423
)
 
47,423

 
$
20.35

 
 
 
 
Vested
 
 
(102,581
)
 
$
19.76

 
 
 
 
Forfeited
30,811

 
(54,447
)
 
$
21.68

 
 
 
 
Balances as of December 31, 2013
1,138,250

 
254,033

 
$
20.55

 
2.01
 
$
4.7