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Net Income Per Share (Tables) | 12 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The following is a reconciliation of the shares used in the denominator for calculating basic and diluted net income per share for the fiscal years ended September 30,
|  | 2013 |  |  | 2014 |  |  | 2015 |
Weighted average common shares outstanding used in calculating basic income per share |  |  | 23,253,992 |  |  |  | 23,916,238 |  |  |  | 24,466,243 |
Effect of dilutive options and non-vested restricted stock awards |  |  | 749,736 |  |  |  | 739,024 |  |  |  | 636,046 |
Weighted average common and common equivalent shares used in calculating diluted income per share |  |  | 24,003,728 |  |  |  | 24,655,262 |  |  |  | 25,102,289 |

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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://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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