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Long-term debt and lease liabilities - Activity in equipment loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Long-term debt and lease liabilities    
Beginning balance $ 12,859 $ 14,347
Operations 23,828 25,304
Repayments (24,472) (26,792)
Ending balance 12,215 12,859
Current portion 12,212 12,804
Long-term portion $ 3 $ 55