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Stock-based Compensation Plans (Tables) | 12 Months Ended
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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 |  |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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