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Significant Accounting Policies (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2019
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Estimated useful live of intangible assets |  |  |  | 10 years |  |  |
Goodwill | $ 67,144,000 | $ 65,643,000 |  | $ 65,643,000 |  | $ 65,450,000 | $ 52,758,000
Goodwill impairment | 0 |  |  |  |  |  |
Uncertain tax positions | $ 0 | 0 |  | 0 |  |  |
Income tax interest expense |  | 0 | $ 0 | 0 | $ 0 |  |
Income tax penalties expense |  | 0 | $ 0 | 0 | $ 0 |  |
Cash, FDIC insured amount |  | $ 250,000 |  | $ 250,000 |  |  |
Treasury stock (in shares) | 0 | 0 |  | 0 |  |  |
Preferred shares authorized (in shares) |  | 5,000,000 |  | 5,000,000 |  |  |
Preferred stock issued (in shares) | 0 | 0 |  | 0 |  |  |
Employee Stock Option |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of awards authorized for issuance (in shares) |  | 0 |  | 0 |  |  |
Expiration term of share-based compensation plan |  |  |  | 10 years |  |  |
Minimum |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Estimated useful of long-lived assets |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Estimated useful of long-lived assets |  |  |  | 7 years |  |  |

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