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Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2017
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.
| 2017 |  | 2016 |  | 2015
| (in millions, except per share data)
Decrease in operating income | $ | 8.6 |  |  | $ | 9.1 |  |  | $ | 7.0 |
Decrease in net income | 4.8 |  |  | 5.8 |  |  | 4.4 |
Decrease in earnings per basic share | 0.03 |  |  | 0.04 |  |  | 0.03 |
Decrease in earnings per diluted share | 0.03 |  |  | 0.04 |  |  | 0.03 |
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, 2014 | 1,206,761 |  |  | $ | 5.04 |  |  | 0.7 |  |
Granted | 459,659 |  |  | 9.70 |  |  |  |  |
Vested | (793,630 | ) |  | 3.99 |  |  |  |  | $ | 7.7 |
Cancelled | — |  |  | — |  |  |  |  |
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 |  |
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
November 27, 2012 |  | 2016 |  | 2013 |  | $ | 5.22 |  |  | 135,553 |  |  | — |  |  | 135,553 |  |  | 2.000 |  | 271,106 |
|  |  |  | 2014 |  | $ | 8.52 |  |  | 135,553 |  |  | — |  |  | 135,553 |  |  | 2.000 |  | 271,106 |
|  |  |  | 2015 |  | $ | 9.78 |  |  | 135,552 |  |  | — |  |  | 135,552 |  |  | 0.000 |  | — |
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 |  | 85,195 |
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 |  |  |  | 77,824 |  |  | (6,752 | ) |  | 71,072 |  |  |  |  |
November 29, 2016 |  | 2020 |  | 2017 |  | $ | 13.26 |  |  | 59,285 |  |  | (5,279 | ) |  | 54,006 |  |  | 1.000 |  | 54,006 |
|  |  |  | 2018 |  |  |  | 59,286 |  |  | (7,227 | ) |  | 52,059 |  |  |  |  |
|  |  |  | 2019 |  |  |  | 59,290 |  |  | (7,227 | ) |  | 52,063 |  |  |  |  |
January 23, 2017 |  | 2020 |  | 2017 |  | $ | 13.15 |  |  | 19,012 |  |  | — |  |  | 19,012 |  |  | 1.000 |  | 19,012 |
|  |  |  | 2018 |  |  |  | 19,011 |  |  | — |  |  | 19,011 |  |  |  |  |
|  |  |  | 2019 |  |  |  | 19,011 |  |  | — |  |  | 19,011 |  |  |  |  |
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, 2014 | 4,552,235 |  |  | $ | 6.37 |  |  | 5.0 |  | $ | 13.6 |
Granted | 97,119 |  |  | 9.97 |  |  |  |  |
Exercised | (506,632 | ) |  | 3.42 |  |  |  |  | 3.2 |
Cancelled | (150,056 | ) |  | 13.90 |  |  |  |  |
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 |
Exercisable at September 30, 2017 | 2,415,475 |  |  | $ | 5.67 |  |  | 2.5 |  | $ | 17.2 |
Expected to vest after September 30, 2017 | 25,179 |  |  | $ | 9.97 |  |  | 7.3 |  | $ | 0.1 |
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, 2017 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 |  |  |  | 804,173 |  |  | $ | 3.29 |  |  | 3.4 |  | 804,173 |  |  | $ | 3.29 |
| $ | 5.00 |  | - | $ | 9.99 |  |  |  | 1,330,050 |  |  | 6.05 |  |  | 2.5 |  | 1,304,871 |  |  | 5.97 |
| $ | 10.00 |  | - | $ | 14.99 |  |  |  | 306,431 |  |  | 10.66 |  |  | 0.2 |  | 306,431 |  |  | 10.66 |
|  |  |  |  |  | 2,440,654 |  |  | $ | 5.72 |  |  | 2.5 |  | 2,415,475 |  |  | $ | 5.67 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average grant-date fair values of stock options granted in 2015 and the weighted average assumptions used to determine these fair values are indicated below.
Grant-date fair value | $ | 5.93 |
Risk-free interest rate | 1.74 | %
Dividend yield | 0.80 | %
Expected life (years) | 8.0 |
Expected annual volatility | 0.6199 |
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, 2014 | 643,288 |  |  | $ | 6.22 |  |  | 0.8 |  |
Granted | 289,524 |  |  | 9.78 |  |  |  |  |
Vested | (317,409 | ) |  |  |  |  |  | $ | 3.1 |
Cancelled | (56,525 | ) |  | 8.29 |  |  |  |  |
Outstanding at September 30, 2015 | 558,878 |  |  | 8.49 |  |  | 0.8 |  |
Granted | 302,875 |  |  | 9.84 |  |  |  |  |
Vested | (270,822 | ) |  |  |  |  |  | 2.5 |
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 |  |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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