Summary of Significant Accounting Policies - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Contract With Customer, Liability [Roll Forward]
Beginning contract liability	$ 38,406	$ 49,667	$ 29,280	$ 63,955
Revenue recognized from contract liabilities included in the beginning balance	(30,998)	(34,891)	(28,236)	(57,896)
Increases due to cash received, net of amounts recognized in revenue during the period	25,151	19,140	31,515	27,857
Ending contract liability	$ 32,559	$ 33,916	$ 32,559	$ 33,916