Goodwill and Intangible Assets - Schedule of Aggregate Amortization Expense for Intangible Assets with Finite Lives (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Intangible Asset, Goodwill and Other [Abstract]
Amortization of acquired intangible assets	$ 11,991	$ 11,536	$ 36,075	$ 34,356
Cost of revenue	7,753	8,178	23,421	24,609
Total amortization expense	$ 19,744	$ 19,714	$ 59,496	$ 58,965

Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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