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Acquisitions - Octo Finances SA - Narrative (Details) $ in Millions	Jan. 31, 2025 USD ($) anniversary	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Business Combination [Line Items]
Purchase price allocated to goodwill		$ 298.3	$ 61.0
Octo
Business Combination [Line Items]
Purchase price	$ 7.5
Additional consideration to be paid	$ 0.9
Additional consideration payment period	45 days
Non-contingent consideration earn-out value	$ 0.1
Number of anniversary | anniversary	2
Purchase price allocated to goodwill	$ 2.1
Total fair value of intangible assets acquired	$ 1.9

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