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Long-term debt - Activity in equipment loans (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Long-term debt.      
Beginning balance $ 12,859 $ 14,347  
Additions 16,192 19,411  
Repayments (18,513) (20,327)  
Ending balance 10,538 13,431  
Current portion 10,525 13,335 $ 12,804
Long-term portion $ 13 $ 96 $ 55