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Employee benefits - Defined benefit plan expense (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Disclosure of defined benefit plans [line items]    
Current service cost $ 13,053 $ 15,878
Past service cost 0 346
Net interest on net defined benefit obligations or assets 51 1,005
Administration expenses 1,575 1,408
Defined benefit plan expenses 14,679 18,637
Costs of services, selling and administrative    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses 13,053 16,224
Net finance costs    
Disclosure of defined benefit plans [line items]    
Defined benefit plan expenses $ 1,626 $ 2,413