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Employee benefits - Defined benefit plan expense (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of defined benefit plans [line items]    
Current service cost $ 13,734,000 $ 13,053,000
Past service cost (288,000) 0
Net interest on net defined benefit obligations or assets 2,998,000 51,000
Administration expenses 1,784,000 1,575,000
Defined benefit plan expenses 18,228,000 14,679,000
Costs of services, selling and administrative    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses 13,446,000 13,053,000
Net finance costs    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses $ 4,782,000 $ 1,626,000