Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 4,430	$ 3,398
Weighted-average remaining lease term (in years)	13 years 4 months 24 days	7 years 3 months 18 days
Weighted-average discount rate	8.00%	8.50%