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Net Income Per Share (Tables) | 9 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The following table presents shares used in the calculation of basic and diluted net income per share:
| Three Months Ended |  |  | Nine Months Ended |
| June 30, |  |  | June 30, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
Weighted average common shares outstanding used in calculating basic income per share |  | 21,499,408 |  |  |  | 22,132,915 |  |  |  | 21,491,117 |  |  |  | 22,100,190 |
Effect of dilutive options and non-vested restricted stock awards |  | 546,492 |  |  |  | 904,764 |  |  |  | 474,238 |  |  |  | 822,336 |
Weighted average common and common equivalent shares used in calculating diluted income per share |  | 22,045,900 |  |  |  | 23,037,679 |  |  |  | 21,965,355 |  |  |  | 22,922,526 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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