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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.
| Year Ended September 30,
(in millions, except share amounts) | 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net income | $ | 55.5 |  |  | $ | 6.4 |  |  | $ | 54.7 |
Less: Allocation to participating securities | (0.9 | ) |  | (0.1 | ) |  | (1.0 | )
Net income allocated to common stockholders | $ | 54.6 |  |  | $ | 6.3 |  |  | $ | 53.7 |
Denominator: |  |  |  |  |
Weighted average number of: |  |  |  |  |
Common shares outstanding | 18,549,011 |  |  | 18,395,987 |  |  | 18,410,561 |
Dilutive potential common shares outstanding: |  |  |  |  |
Share-based awards | 385,819 |  |  | 291,367 |  |  | 214,811 |
Diluted shares outstanding | 18,934,830 |  |  | 18,687,354 |  |  | 18,625,372 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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