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Intangible Assets - Intangible Assets Acquired During the Period (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 03, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Business licenses | Global Payments |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets acquired |  | $ 0.5 |
Chasing Returns Limited | Software programs/platforms |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 2.4 | 2.4 |
UOB Bullion and Futures Limited | Customer base |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | $ 3.1
IFCM Commodities Acquisition | Customer base |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | 1.0
Quest Capital Strategies Inc | Customer base |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | 1.7
Gain Capital Holdings Inc | Software programs/platforms |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  | 22.2 |
Gain Capital Holdings Inc | Customer base |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | 9.8
Gain Capital Holdings Inc | Trade/domain names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | 3.7
GIROXX | Software programs/platforms |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets acquired |  | $ 1.5 |
GIROXX | Business licenses |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets acquired |  |  | $ 0.4

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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