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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:
 
Year Ended September 30,
 
2017
 
2016
 
2015
Expected stock price volatility
31
%
 
28
%
 
28
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk free interest rate
0.99
%
 
0.83
%
 
0.66
%
Average expected life (in years)
3.08

 
3.06

 
3.22
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following is a summary of stock option activity for the year ended September 30, 2017:
 
Shares
Available for
Grant
 
Number of
Options
Outstanding
 
Weighted
Average 
Exercise Price
 
Weighted
Average
Grant Date
Fair Value
 
Weighted
Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic
Value
($ millions)
Balances at September 30, 2016
754,163

 
1,215,821

 
$
29.55

 
$
12.88

 
3.80
 
$
14.1

Granted
(110,000
)
 
110,000

 
$
38.77

 
$
8.67

 
 
 
 
Exercised
 
 
(155,588
)
 
$
22.54

 
$
9.05

 
 
 
 
Forfeited
8,331

 
(106,996
)
 
$
26.15

 
$
13.20

 
 
 
 
Expired
 
 
(181,834
)
 
$
54.02

 
$
19.93

 
 
 
 
Balances at September 30, 2017
652,494

 
881,403

 
$
27.31

 
$
11.55

 
3.57
 
$
9.8

Exercisable at September 30, 2017
 
 
222,116

 
$
24.42

 
$
10.43

 
2.52
 
$
3.1
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The options outstanding as of September 30, 2017 broken down by exercise price are as follows:
Exercise Price
 
Number of Options Outstanding
 
Weighted Average Exercise Price
 
Weighted Average Remaining Term
(in Years)
$
—

-
$
5.00

 
—

 
n/a

 
n/a
$
5.00

-
$
10.00

 
—

 
n/a

 
n/a
$
10.00

-
$
15.00

 
—

 
n/a

 
n/a
$
15.00

-
$
20.00

 
22,414

 
$
19.24

 
0.30
$
20.00

-
$
25.00

 
97,911

 
$
21.77

 
0.84
$
25.00

-
$
30.00

 
580,000

 
$
25.91

 
4.37
$
30.00

-
$
35.00

 
73,578

 
$
31.37

 
2.28
$
35.00

-
$
40.00

 
107,500

 
$
38.77

 
3.27
$
40.00

-
$
45.00

 
—

 
n/a

 
n/a
$
45.00

-
$
50.00

 
—

 
n/a

 
n/a
$
50.00

-
$
55.00

 
—

 
n/a

 
n/a
 
 
 
 
881,403

 
$
27.31

 
3.57
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following is a summary of restricted stock activity through September 30, 2017:
 
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 at September 30, 2016
747,782

 
357,752

 
$
27.39

 
1.39
 
$
13.9

Additional shares authorized by shareholders
1,500,000

 
 
 
 
 
 
 
 
Termination of 2012 plan
(640,539
)
 
 
 
 
 
 
 
 
Granted
(147,726
)
 
147,726

 
$
40.98

 
 
 
 
Vested
 
 
(150,545
)
 
$
26.69

 
 
 
 
Forfeited
459

 
(459
)
 
$
37.31

 
 
 
 
Balances at September 30, 2017
1,459,976

 
354,474

 
$
33.34

 
1.26
 
$
13.6