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Stock-based Compensation Plans (Tables)
 12 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] The effect of stock-based compensation on our statements of operations, including discontinued operations, is presented below.
 
2018
 
2017
 
2016
 
(in millions, except per share data)
Decrease in operating income
$
6.4

 
$
8.6

 
$
9.1

Decrease in net income
4.0

 
4.8

 
5.8

Decrease in earnings per basic share
0.03

 
0.03

 
0.04

Decrease in earnings per diluted share
0.03

 
0.03

 
0.04
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Restricted stock unit activity under the 2006 Plan is summarized below.
 
Restricted stock units
 
Weighted
average
grant date fair value per unit
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
  (millions)  
Outstanding at September 30, 2015
872,790

 
$
8.45

 
0.8
 
 
Granted
360,255

 
9.33

 
 
 
 
Vested
(510,535
)
 
7.94

 
 
 
$
4.7

Cancelled
(59,062
)
 
8.23

 
 
 
 
Outstanding at September 30, 2016
663,448

 
9.34

 
1.0
 
 
Granted
343,860

 
13.05

 
 
 
 
Vested
(359,797
)
 
9.34

 
 
 
4.7

Cancelled
(21,681
)
 
13.26

 
 
 
 
Outstanding at September 30, 2017
625,830

 
11.23

 
0.9
 
 
Granted
276,658

 
12.20

 
 
 
 
Vested
(342,038
)
 
10.84

 
 
 
4.2

Cancelled
(78,888
)
 
11.41

 
 
 
 
Outstanding at September 30, 2018
481,562

 
12.14

 
1.0
 
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block] Stock-settled PRSUs activity under the 2006 Plan is summarized below.
Award date
 
Settlement year
 
Performance period
 
Grant date per unit fair value
 
Units
awarded
 
Units forfeited
 
Net units
 
Performance factor
 
Shares
earned
December 3, 2013
 
2017
 
2014
 
$
8.52

 
90,841

 
(4,401
)
 
86,440

 
2.000
 
172,880

 
 
 
 
2015
 
$
9.78

 
90,841

 
(4,401
)
 
86,440

 
0.000
 
—

 
 
 
 
2016
 
$
9.38

 
90,849

 
(7,402
)
 
83,447

 
1.021
 
85,199

December 2, 2014
 
2018
 
2015
 
$
9.78

 
80,233

 
(3,835
)
 
76,398

 
0.000
 
—

 
 
 
 
2016
 
$
9.38

 
80,229

 
(6,447
)
 
73,782

 
1.021
 
75,327

 
 
 
 
2017
 
$
13.26

 
80,229

 
(11,673
)
 
68,556

 
1.000
 
68,556

December 1, 2015
 
2019
 
2016
 
$
9.38

 
77,823

 
(3,998
)
 
73,825

 
1.021
 
75,375

 
 
 
 
2017
 
$
13.26

 
77,824

 
(3,997
)
 
73,827

 
1.000
 
73,827

 
 
 
 
2018
 
$
12.50

 
77,824

 
(61,841
)
 
15,983

 
1.357
 
21,689

November 29, 2016
 
2020
 
2017
 
$
13.26

 
59,285

 
(5,279
)
 
54,006

 
1.000
 
54,006

 
 
 
 
2018
 
$
12.50

 
59,286

 
(39,910
)
 
19,376

 
1.357
 
26,294

 
 
 
 
2019
 
 
 
59,290

 
(39,909
)
 
19,381

 
 
 
 
January 23, 2017
 
2020
 
2017
 
$
13.15

 
19,012

 
—

 
19,012

 
1.000
 
19,012

 
 
 
 
2018
 
$
12.50

 
19,011

 
—

 
19,011

 
1.357
 
25,798

 
 
 
 
2019
 
 
 
19,011

 
—

 
19,011

 
 
 
 
November 28, 2017
 
2021
 
2018
 
$
12.50

 
57,092

 
—

 
57,092

 
1.357
 
77,474

 
 
 
 
2019
 
 
 
57,092

 
—

 
57,092

 
 
 
 
 
 
 
 
2020
 
 
 
57,104

 
—

 
57,104

 
 
 
 
Schedule of Share-based Compensation. Options Stock option activity under the 2006 Plan is summarized below.
 
Options
 
Weighted
average
exercise
price
per option
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
(millions)  
Outstanding at September 30, 2015
3,992,666

 
$
6.54

 
4.2
 
$
9.3

Exercised
(270,599
)
 
6.83

 
 
 
0.8

Cancelled
(167,759
)
 
17.82

 
 
 
 
Outstanding at September 30, 2016
3,554,308

 
5.99

 
3.4
 
23.8

Exercised
(905,834
)
 
4.71

 
 
 
7.3

Cancelled
(207,820
)
 
14.72

 
 
 
 
Outstanding at September 30, 2017
2,440,654

 
5.72

 
2.5
 
17.3

Exercised
(851,628
)
 
7.00

 
 
 
3.8

Cancelled
—

 
—

 
 
 
 
Outstanding at September 30, 2018
1,589,026

 
$
5.03

 
1.9
 
$
10.3

 
 
 
 
 
 
 
 
Exercisable at September 30, 2018
1,589,026

 
$
5.03

 
1.9
 
$
10.3

 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] The ranges of exercise prices for stock options outstanding at September 30, 2018 are summarized below.
Exercise price
 
Options
 
Weighted
average
exercise price
 
Weighted
average
remaining
contractual
term (years)
 
Exercisable options
 
Weighted
average
exercise price
 
$
0.00

-
$
4.99

 
 
555,319

 
$
3.32

 
2.4
 
555,319

 
$
3.32

 
$
5.00

-
$
9.99

 
 
1,033,707

 
5.95

 
1.6
 
1,033,707

 
5.95

 
 
 
 
 
 
1,589,026

 
$
5.03

 
1.9
 
1,589,026

 
$
5.03
Schedule of Share-based Compensation, Phantom Award, Activity Phantom Plan activity is summarized below.
 
Phantom
Plan units  
 
Weighted
average
grant date
fair value
  per unit  
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
  (millions)  
Outstanding at September 30, 2015
558,878

 
$
6.22

 
0.8
 
 
Granted
302,875

 
9.84

 
 
 
 
Vested
(270,822
)
 
 
 
 
 
$
3.1

Cancelled
(56,905
)
 
9.28

 
 
 
 
Outstanding at September 30, 2016
534,026

 
9.60

 
0.9
 
 
Granted
199,260

 
13.22

 
 
 
 
Vested
(278,000
)
 
 
 
 
 
3.7

Cancelled
(103,279
)
 
10.87

 
 
 
 
Outstanding at September 30, 2017
352,007

 
11.36

 
0.9
 
 
Granted
163,199

 
12.40

 
 
 
 
Vested
(170,675
)
 
 
 
 
 
2.1

Cancelled
(81,758
)
 
12.10

 
 
 
 
Outstanding at September 30, 2018
262,773

 
12.12

 
0.6