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Long-term debt and lease liabilities - Movement in lease liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Operating      
Beginning balance $ 15,840 $ 16,236  
Acquisitions 2,074    
Operations 3,953 4,229  
Lease terminations (82) (438)  
Repayments (5,015) (4,187)  
Ending balance $ 16,770 $ 15,840  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent
Finance      
Beginning balance $ 3,310 $ 2,914  
Acquisitions 456    
Operations 842 1,975  
Repayments of finance leases (1,436) (1,579)  
Ending balance $ 3,172 $ 3,310  
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent Lease Liability, Current, Lease Liability Noncurrent
Total      
Beginning balance $ 19,150 $ 19,150  
Acquisitions 2,530    
Operations 4,795 6,204  
Lease terminations (82) (438)  
Repayments (6,451) (5,766)  
Ending balance $ 19,942 $ 19,150