Treasury Stock - Narrative (Details) - USD ($) |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Oct. 03, 2018 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Oct. 15, 2019 |
Oct. 10, 2019 |
Sep. 30, 2017 |
May 31, 2017 |
Mar. 31, 2017 |
Sep. 30, 2013 |
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| Stockholders Equity Note [Abstract] | ||||||||||
| Number of shares authorized to be repurchased (up to) | 7,000 | 7,000 | 7,000,000 | 2,000,000 | 5,000,000 | 105,000 | ||||
| Purchased (in shares) | 7,000 | 752,234 | 72,266 | |||||||
| Purchased cost | $ 238,000 | $ 25,576,000 | $ 2,214,756 | |||||||
| New shares issued (in shares) | 752,234 | |||||||||
| Shares issued (in dollars per share) | $ 34.00 | |||||||||
| Cost of shares | $ 25,575,956 | |||||||||
| X | ||||||||||
- Definition Per share or per unit amount of equity securities issued. No definition available.
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| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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