Leases - Summary of Information Related to Lease Costs for Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating lease cost	$ 21,332	$ 18,092	$ 12,059
Short-term and variable lease cost	6,062	4,466	3,002
Total	$ 27,394	$ 22,558	$ 15,061