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Employee benefits - Fair value of plan assets (Details) - CAD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Disclosure of fair value of plan assets [line items]    
Quoted equities $ 205,130 $ 196,611
Quoted bonds 139,584 102,658
Cash 5,642 143,377
Other 261,755 199,323
Plan assets 612,111 641,969
U.K.    
Disclosure of fair value of plan assets [line items]    
Quoted equities 205,130 196,611
Quoted bonds 139,584 102,658
Cash 5,566 143,312
Other 185,946 129,328
Plan assets 536,226 571,909
Germany    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 0 0
Other 11,747 11,028
Plan assets 11,747 11,028
Other    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 76 65
Other 64,062 58,967
Plan assets $ 64,138 $ 59,032