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Description of the Business and Summary of Significant Accounting Policies - Schedule of Severance and Related Charges (Details) - 2024 Global Workforce Reduction Plan - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Charges	$ 2.3	$ 49.5
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenue
Charges	$ 0.3
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Research and development
Charges	$ 1.2
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Sales and marketing
Charges	$ 0.3
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	General and administrative
Charges	$ 0.5

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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