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Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share [Abstract] |  |
Net income | $ 8.8 | $ 9.4
Less: Net income allocated to participating securities | (0.1) | (0.2)
Net income allocated to common shareholders | 8.7 | 9.2
Diluted net income | 8.8 | 9.4
Less: Diluted net income allocation to participating securities | (0.1) | (0.2)
Diluted net income allocated to common shareholders | $ 8.7 | $ 9.2
Weighted average number of common shares outstanding | 18,648,150 | 18,515,528
Dilutive potential common shares outstanding: |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 343,753 | 246,501
Diluted weighted-average shares | 18,991,903 | 18,762,029

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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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