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Employee benefits - Defined benefit plan expense (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disclosure of defined benefit plans [line items]    
Current service cost $ 14,165,000 $ 13,734,000
Past service cost 0 (288,000)
Interest cost 6,101,000 2,998,000
Administration expenses paid from the plan 1,462,000 1,784,000
Defined benefit plan expenses 21,728,000 18,228,000
Costs of services, selling and administrative    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses 14,165,000 13,446,000
Net finance costs    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses $ 7,563,000 $ 4,782,000