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Long-term debt and lease liabilities- Equipment loans (Details)
12 Months Ended
Sep. 30, 2025
USD ($)
installment
Sep. 30, 2024
USD ($)
Long-term debt and lease liabilities    
Interest rate 0.00%  
Equipment loan    
Long-term debt and lease liabilities    
Number of installments | installment 12  
Interest expense $ 800,000 $ 985,000
Unamortized discount 252,000  
Carrying value of secured equipment $ 22,153,000 $ 22,871,000
Equipment loan | Minimum    
Long-term debt and lease liabilities    
Incremental borrowing rate 6.60%  
Equipment loan | Maximum    
Long-term debt and lease liabilities    
Incremental borrowing rate 8.00%