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Long-term debt - Activity in lease liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating    
Beginning balance $ 15,840 $ 16,236
Additions 2,100 3,049
Non-cash adjustments (79) (139)
Repayments (3,687) (3,238)
Ending balance $ 14,174 $ 15,908
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent
Finance    
Beginning balance $ 3,310 $ 2,914
Additions 492 1,760
Repayments of finance leases (1,115) (1,139)
Ending balance $ 2,687 $ 3,535
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent
Total    
Beginning balance $ 19,150 $ 19,150
Additions 2,592 4,809
Non-cash adjustments (79) (139)
Repayments (4,802) (4,377)
Ending balance $ 16,861 $ 19,443