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Treasury Stock - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | May 31, 2017 | Mar. 31, 2017 | Sep. 30, 2015 | Sep. 30, 2013
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) |  |  | 7,000,000 |  | 2,000,000 | 5,000,000 | 170,000 | 105,000
Purchased (in shares) |  | 72,266 | 104,145 | 78,446 |  |  |  |
Purchased | $ 1,676,443 | $ 2,214,756 | $ 3,064,000 | $ 3,141,000 |  |  |  |

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