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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Earnings Per Share [Abstract] |  |  |
Income from Continuing Operations | $ 55.7 | $ 19.6 | $ 18.6
Undistributed Earnings Allocated to Participating Securities - Continuing Operations | (1.3) | (0.5) | (0.7)
Income from continuing operations allocated to common shareholders | 54.4 | 19.1 | 17.9
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | 0.0 | (0.3) | 0.7
Undistributed Earnings Allocated to Participating Securities - Discontinued Operations | 0.0 | 0.0 | (0.1)
Income from discontinued operations allocated to common shareholders | 0.0 | (0.3) | 0.6
Diluted net income | 55.7 | 19.3 | 19.3
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted | (1.3) | (0.5) | (0.8)
Diluted net income allocated to common shareholders | $ 54.4 | $ 18.8 | $ 18.5
Weighted Average Number of Shares Outstanding, Basic | 18,525,374 | 18,528,302 | 18,443,233
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |
Share-based Awards For Diluted Earnings Per Share Calculation | 406,861 | 604,000 | 625,264
Diluted weighted-average shares | 18,932,235 | 19,132,302 | 19,068,497

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- Definition Undistributed Earnings Allocated to Participating Securities - Continuing Operations represents earnings from continuing operations allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed. + References No definition available. + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4613673-111683 + Details
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