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Provisions (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Reconciliation of changes in other provisions [abstract]    
Beginning balance $ 46,422,000  
Additional provisions 246,308,000  
Utilized amounts (104,793,000)  
Reversals of unused amounts (10,734,000)  
Discount rate adjustment and imputed interest 433,000  
Foreign currency translation adjustment 6,360,000  
Ending balance 183,996,000  
Current portion 144,331,000 $ 27,471,000
Non-current portion 39,665,000 $ 18,951,000
Severance    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 12,003,000  
Additional provisions 217,475,000  
Utilized amounts (95,650,000)  
Reversals of unused amounts (3,819,000)  
Discount rate adjustment and imputed interest 0  
Foreign currency translation adjustment 4,307,000  
Ending balance 134,316,000  
Current portion 119,850,000  
Non-current portion 14,466,000  
Decommissioning liabilities    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 20,038,000  
Additional provisions 7,719,000  
Utilized amounts (647,000)  
Reversals of unused amounts (628,000)  
Discount rate adjustment and imputed interest 297,000  
Foreign currency translation adjustment 1,159,000  
Ending balance 27,938,000  
Current portion 6,786,000  
Non-current portion 21,152,000  
Provisions based on expected cash flows $ 26,718,000  
Weighted average rate 1.73%  
Others    
Reconciliation of changes in other provisions [abstract]    
Beginning balance $ 14,381,000  
Additional provisions 21,114,000  
Utilized amounts (8,496,000)  
Reversals of unused amounts (6,287,000)  
Discount rate adjustment and imputed interest 136,000  
Foreign currency translation adjustment 894,000  
Ending balance 21,742,000  
Current portion 17,695,000  
Non-current portion $ 4,047,000  
Minimum | Decommissioning liabilities    
Reconciliation of changes in other provisions [abstract]    
Timing of settlements 1 year  
Maximum | Decommissioning liabilities    
Reconciliation of changes in other provisions [abstract]    
Timing of settlements 15 years