Leases - Schedule of Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Cash received for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 0	$ 0	$ 0	$ 3,099
Right-of-use assets obtained in exchange for amended operating lease liabilities	0	0	0	64
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 3,840	$ 2,046	$ 7,680	$ 4,016
Weighted-average remaining lease term (in years)	12 years 1 month 6 days	13 years	12 years 1 month 6 days	13 years
Weighted-average discount rate	8.00%	8.00%	8.00%	8.00%