Summary of Significant Accounting Policies and Estimates - Software Development Costs (Details) $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) category	Dec. 31, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of categories \| category	3
Capitalized internal-use software
Finite-Lived Intangible Assets [Line Items]
Capitalized software costs	$ 1.8	$ 0.9
Capitalized internal-use software \| Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Capitalized internal-use software \| Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years
Hosting Arrangements
Finite-Lived Intangible Assets [Line Items]
Capitalized software costs	$ 10.7	1.5
External-Use Software Development Cost
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years
Capitalized software costs	$ 0.9	$ 0.2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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