Leases - Reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Operating leases
2024	$ 6,826	$ 5,953
2025	5,645	5,132
2026	4,436	3,790
2027	4,229	2,881
2028 and thereafter	32,806	17,029
Total minimum lease payments	53,942	34,785
Less: amounts representing interest	12,262	4,760
Present value of net minimum lease payments	41,680	30,025
Less: current portion of lease obligations	5,126	5,172
Non-current portion of lease obligations	36,554	24,853
ROU assets	$ 39,839	$ 29,150
Location of operating lease liabilities included on Consolidated Balance Sheets	Accrued other expenses	Accrued other expenses
Finance leases
2024	$ 2,315	$ 2,256
2025	2,370	2,315
2026	2,434	2,370
2027	2,494	2,434
2028 and thereafter	16,503	18,997
Total minimum lease payments	26,116	28,372
Less: amounts representing interest	6,265	7,189
Present value of net minimum lease payments	19,851	21,183
Less: current portion of lease obligations	1,444	1,331
Non-current portion of lease obligations	18,407	19,852
ROU assets	$ 15,771	$ 17,343
Location of finance lease liabilities included on Consolidated Balance Sheets	Accrued other expenses	Accrued other expenses
Location of finance lease ROU assets included on Consolidated Balance Sheets	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net