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Employee benefits - Fair value of plan assets (Details) - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Disclosure of fair value of plan assets [line items]    
Quoted equities $ 196,611 $ 426,066
Quoted bonds 102,658 109,787
Cash 143,377 37,038
Other 173,907 463,403
Plan assets 616,553 1,036,294
U.K.    
Disclosure of fair value of plan assets [line items]    
Quoted equities 196,611 426,066
Quoted bonds 102,658 109,787
Cash 143,312 36,974
Other 129,328 413,532
Plan assets 571,909 986,359
France    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 0 0
Other 0 661
Plan assets 0 661
Germany    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 0 0
Other 11,028 12,234
Plan assets 11,028 12,234
Other    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 65 64
Other 33,551 36,976
Plan assets $ 33,616 $ 37,040