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Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2015
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 is presented below.
| 2015 |  | 2014 |  | 2013
| (in millions, except per share data)
Decrease in operating income | $ | 7.0 |  |  | $ | 13.2 |  |  | $ | 11.4 |
Decrease in net income | 4.4 |  |  | 8.1 |  |  | 6.9 |
Decrease in earnings per basic share | 0.03 |  |  | 0.05 |  |  | 0.04 |
Decrease in earnings per diluted share | 0.03 |  |  | 0.05 |  |  | 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, 2012 | 2,423,762 |  |  | $ | 4.13 |  |  | 1.0 |  |
Granted | 509,338 |  |  | 5.37 |  |  |  |  |
Vested | (995,037 | ) |  | 4.77 |  |  |  |  | $ | 5.6 |
Cancelled | (12,723 | ) |  | 12.28 |  |  |  |  |
Outstanding at September 30, 2013 | 1,925,340 |  |  | 4.30 |  |  | 0.9 |  |
Granted | 381,012 |  |  | 8.51 |  |  |  |  |
Vested | (1,099,591 | ) |  | 4.94 |  |  |  |  | 9.4 |
Cancelled | — |  |  | — |  |  |  |  |
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 |  |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | Stock-settled PRSUs activity under the 2006 Plan is summarized below.
Award date |  | Performance period |  | Units awarded |  | Shares earned
November 27, 2012 |  | 2013 |  | 135,553 |  |  | 271,106 |
|  | 2014 |  | 135,553 |  |  | 271,106 |
|  | 2015 |  | 135,552 |  |  | 0 |
December 3, 2013 |  | 2014 |  | 90,841 |  |  | 181,682 |
|  | 2015 |  | 90,841 |  |  | 0 |
|  | 2016 |  | 90,849 |  |  | n/a |
December 2, 2014 |  | 2015 |  | 80,233 |  |  | 0 |
|  | 2016 |  | 80,229 |  |  | n/a |
|  | 2017 |  | 80,229 |  |  | n/a |
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, 2012 | 5,522,610 |  |  | $ | 6.30 |  |  | 6.8 |  | $ | 3.5 |
Granted | 125,780 |  |  | 5.91 |  |  |  |  |
Exercised | (384,475 | ) |  | 4.97 |  |  |  |  | 1.2 |
Cancelled | (139,209 | ) |  | 12.52 |  |  |  |  |
Outstanding at September 30, 2013 | 5,124,706 |  |  | 6.22 |  |  | 5.9 |  | 14.6 |
Granted | 86,904 |  |  | 8.58 |  |  |  |  |
Exercised | (587,964 | ) |  | 4.61 |  |  |  |  | — |
Cancelled | (71,411 | ) |  | 12.92 |  |  |  |  |
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 |
Exercisable at September 30, 2015 | 3,799,877 |  |  | $ | 6.43 |  |  | 3.9 |  | $ | 9.3 |
Expected to vest after September 30, 2015 | 192,789 |  |  | $ | 8.76 |  |  | 8.6 |  | $ | 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, 2015 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 |  |  |  | 1,395,711 |  |  | $ | 3.34 |  |  | 5.4 |  | 1,395,711 |  |  | $ | 3.34 |
| $ | 5.00 |  | - | $ | 9.99 |  |  |  | 1,799,892 |  |  | 6.07 |  |  | 4.3 |  | 1,607,103 |  |  | 5.74 |
| $ | 10.00 |  | - | $ | 14.99 |  |  |  | 515,846 |  |  | 11.30 |  |  | 2.0 |  | 515,846 |  |  | 11.30 |
| $ | 15.00 |  | - | $ | 20.99 |  |  |  | 281,217 |  |  | 16.76 |  |  | 0.8 |  | 281,217 |  |  | 16.76 |
|  |  |  |  |  | 3,992,666 |  |  | $ | 6.54 |  |  | 4.2 |  | 3,799,877 |  |  | $ | 6.43 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average grant-date fair values of stock options granted and the weighted average assumptions used to determine these fair values are indicated below.
| 2015 |  | 2014 |  | 2013
Grant-date fair value | $ | 5.93 |  |  | $ | 5.13 |  |  | $ | 5.91 |
Risk-free interest rate | 1.74 | % |  | 2.44 | % |  | 1.63 | %
Dividend yield | 0.80 | % |  | 1.10 | % |  | 2.17 | %
Expected life (years) | 8.0 |  |  | 8.0 |  |  | 8.0 |
Expected annual volatility | 0.6199 |  |  | 0.6386 |  |  | 0.6696 |
Schedule of Share-based Compensation, Phantom Award, Activity | Phantom Plan activity for 2015 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, 2012 | 358,866 |  |  | $ | 2.03 |  |  | 1.2 |  |
Granted | 382,605 |  |  | 5.22 |  |  |  |  |
Vested | (119,637 | ) |  |  |  |  |  | $ | 0.7 |
Cancelled | (12,852 | ) |  | 2.03 |  |  |  |  |
Outstanding at September 30, 2013 | 608,982 |  |  | 4.03 |  |  | 1.0 |  |
Granted | 304,815 |  |  | 8.52 |  |  |  |  |
Vested | (240,739 | ) |  |  |  |  |  | 2.1 |
Cancelled | (29,770 | ) |  | 5.29 |  |  |  |  |
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 |  |

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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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