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Stock-based Compensation (Tables)
 12 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
A summary of the expense related to stock-based compensation by award type is as follows for the periods presented:
 
 
Fiscal Year Ended September 30,
(In millions)
 
2015
 
2014
 
2013
Stock options expense
 
$
0.7

 
$
0.8

 
$
0.9

Restricted stock awards expense
 
5.4

 
1.8

 
2.0

Before tax stock-based compensation expense
 
6.1

 
2.6

 
2.9

Tax benefit
 
(1.5
)
 
(0.7
)
 
(0.6
)
After tax stock-based compensation expense
 
$
4.6

 
$
1.9

 
$
2.3
Schedule of Assumptions for Stock Options Granted During Period
The fair value of each stock option is estimated on the date of grant using the Black-Scholes option-pricing model. We used the following assumptions for options granted, which derived the fair value shown, during the periods presented:
 
 
Fiscal Year Ended September 30,
 
 
2014
 
2013
Expected life of options
 
5.1 years

 
5.0 years

Expected volatility
 
45.99
%
 
46.15
%
Expected dividends
 
—

 
—

Weighted average risk-free interest rate
 
1.42
%
 
0.63
%
Weighted average fair value
 
$
7.97

 
$
5.48
Schedule of Stock Options and SSARs Outstanding, and Related Activity
The following table summarizes stock options outstanding as of September 30 and activity during the fiscal years ended September 30 for the periods presented:
 
2015
 
2014
 
2013
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
650,223

 
$
18.12

 
560,784

 
$
33.01

 
429,973

 
$
48.80

Granted
—

 
—

 
161,010

 
19.11

 
160,651

 
13.56

Exercised
(1,209
)
 
12.07

 
(2,788
)
 
14.29

 
(681
)
 
10.80

Expired
—

 
—

 
(55,811
)
 
170.32

 
(22,914
)
 
47.65

Forfeited
(5,107
)
 
19.05

 
(12,972
)
 
19.85

 
(6,245
)
 
17.93

Outstanding at end of period
643,907

 
$
18.13

 
650,223

 
$
18.12

 
560,784

 
$
33.01

Exercisable at end of period
491,029

 
$
18.40

 
355,703

 
$
19.74

 
310,120

 
$
48.73

Vested or expected to vest in the future
643,877

 
$
18.13

 
649,773

 
$
18.12

 
558,519

 
$
33.09
Schedule of Stock Options and SSARS Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable as of September 30, 2015:
 
 
Stock Options Outstanding
 
Stock Options Exercisable
Range of Exercise Price
 
Number Outstanding
 
Weighted Average Contractual Remaining Life (Years)
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Contractual Remaining Life (Years)
 
Weighted Average Exercise Price
 
 
 
 
 
 
 
 
 
 
 
 
 
$1 - $15
 
253,703

 
4.71
 
$
12.28

 
204,328

 
4.61
 
$
12.02

$16 - $20
 
247,781

 
4.20
 
19.30

 
144,278

 
2.84
 
19.43

$21- $30
 
142,423

 
1.82
 
26.51

 
142,423

 
1.82
 
26.51

$1- $30
 
643,907

 
3.88
 
$
18.13

 
491,029

 
3.28
 
$
18.40
Schedule of Nonvested Stock Awards and Performance Shares
Activity relating to all restricted stock awards is as follows for the periods presented:
 
Fiscal Year Ended September 30,
 
2015
 
2014
 
2013
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Beginning of period
746,567

 
$
15.76

 
280,416

 
$
12.32

 
323,335

 
$
19.61

Granted
410,192

 
19.01

 
595,567

 
18.68

 
99,413

 
10.95

Vested
(64,719
)
 
15.96

 
(113,320
)
 
22.55

 
(126,124
)
 
27.59

Forfeited
(135,757
)
 
7.77

 
(16,096
)
 
15.93

 
(16,208
)
 
30.57

End of period
956,283

 
$
18.27

 
746,567

 
$
15.76

 
280,416

 
$
12.32