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Earnings per Share - EPS Reconciliation (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 23,400,000.0 | $ 22,700,000.0 | $ 41,600,000 | $ 15,800,000
Less: Net income allocated to participating securities | (400,000) | (300,000) | (700,000) | (300,000)
Net income allocated to common shareholders | $ 23,000,000 | $ 22,400,000 | $ 40,900,000 | $ 15,500,000
Weighted average number of common shares outstanding | 18,753,490 | 18,559,849 | 18,706,104 | 18,502,795
Dilutive potential common shares outstanding: |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 251,303 | 299,484 | 293,785 | 333,418
Diluted weighted-average shares | 19,004,793 | 18,859,333 | 18,999,889 | 18,836,213

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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 after tax of income (loss) from continuing operations attributable to the parent. + 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=98514028&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=63488584&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=96868048&loc=SL4613673-111683 + Details
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