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Acquisitions - Quest Capital and Carl Kliem S.A. (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Aug. 31, 2019 | Nov. 30, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life |  |  |  | 1 year |  |
Bargain purchase gain |  |  |  | $ 3.3 | $ 81.9 | $ 5.5
Quest Capital Strategies Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 1.7 |  |  |  |
Quest Capital Strategies Inc | Customer Lists And Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life |  | 7 years |  |  |  |
Carl Kliem S.A. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  | $ 2.1 |  |  |
Cash and cash equivalents |  |  | 1.7 |  |  |
Receivables from clients |  |  | 1.1 |  |  |
Property and equipment, net |  |  | 0.1 |  |  |
Income tax receivable |  |  | 0.1 |  |  |
Accounts payable and other accrued liabilities |  |  | 0.6 |  |  |
Payable to clients |  |  | $ 0.2 |  |  |
Bargain purchase gain |  |  |  |  |  | 0.1
Operating revenues post-acquisition results of the acquired business |  |  |  |  |  | 4.2
Net income (loss) post-acquisition results of the acquired business |  |  |  |  |  | $ (2.3)
GIROXX |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 4.4 |  |  |  |  |
Cash and cash equivalents | 6.5 |  |  |  |  |
Property and equipment, net | 0.1 |  |  |  |  |
Accounts payable and other accrued liabilities | 0.6 |  |  |  |  |
Payable to clients | $ 5.8 |  |  |  |  |
Operating revenues post-acquisition results of the acquired business |  |  |  |  | 0.5 |
Net income (loss) post-acquisition results of the acquired business |  |  |  |  | $ (0.6) |
GIROXX | Capitalized software development |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 3 years |  |  |  |  |

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