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, 2022	Sep. 30, 2021
Operating leases
Year 1	$ 5,953	$ 5,448
Year 2	5,132	4,679
Year 3	3,790	4,032
Year 4	2,881	3,654
Year 5 and thereafter	17,029	20,453
Total minimum lease payments	34,785	38,266
Less: amounts representing interest	4,760	5,691
Present value of net minimum lease payments	$ 30,025	$ 32,575
Location of operating lease liabilities included on Consolidated Balance Sheets	Less: current portion of lease obligations, Non-current portion of lease obligations	Less: current portion of lease obligations, Non-current portion of lease obligations
Less: current portion of lease obligations	$ 5,172	$ 4,543
Non-current portion of lease obligations	24,853	28,032
ROU assets	$ 29,150	$ 31,846
Location of operating lease ROU assets included on Consolidated Balance Sheets	ROU assets	ROU assets
Finance leases
Year 1	$ 2,256	$ 3,153
Year 2	2,315	3,235
Year 3	2,370	3,319
Year 4	2,434	3,399
Year 5 and thereafter	18,997	25,516
Total minimum lease payments	28,372	38,622
Less: amounts representing interest	7,189	9,092
Present value of net minimum lease payments	$ 21,183	$ 29,530
Location of finance lease liabilities included on Consolidated Balance Sheets	Accrued other expenses, Other liabilities	Accrued other expenses, Other liabilities
Less: current portion of lease obligations	$ 1,331	$ 2,180
Non-current portion of lease obligations	19,852	27,350
ROU assets	$ 17,343	$ 24,964
Location of finance lease ROU assets included on Consolidated Balance Sheets	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net