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Earnings per Share (Tables) | 9 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding. The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in millions, except share amounts) | 2016 |  | 2015 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |  |
Net income | $ | 14.6 |  |  | $ | 12.2 |  |  | $ | 37.9 |  |  | $ | 34.6 |
Less: Allocation to participating securities | (0.3 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.8 | )
Net income allocated to common stockholders | $ | 14.3 |  |  | $ | 11.9 |  |  | $ | 37.3 |  |  | $ | 33.8 |
Diluted net income | $ | 14.6 |  |  | $ | 12.2 |  |  | $ | 37.9 |  |  | $ | 34.6 |
Less: Allocation to participating securities | (0.3 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.8 | )
Diluted net income allocated to common stockholders | $ | 14.3 |  |  | $ | 11.9 |  |  | $ | 37.3 |  |  | $ | 33.8 |
Denominator: |  |  |  |  |  |  |
Weighted average number of: |  |  |  |  |  |  |
Common shares outstanding | 18,138,754 |  |  | 18,698,734 |  |  | 18,461,063 |  |  | 18,573,617 |
Dilutive potential common shares outstanding: |  |  |  |  |  |  |
Share-based awards | 183,697 |  |  | 386,013 |  |  | 194,609 |  |  | 379,554 |
Diluted weighted-average shares | 18,322,451 |  |  | 19,084,747 |  |  | 18,655,672 |  |  | 18,953,171 |

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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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