Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash received for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 3,099	$ 0
Right-of-use assets obtained in exchange for amended operating lease liabilities	64	0
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,080	$ 1,331
Weighted-average remaining lease term (in years)	13 years 3 months 18 days	6 years 10 months 24 days
Weighted-average discount rate	8.00%	8.50%