v3.25.3
Employee benefits - Fair value of plan assets (Details) - CAD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Disclosure of fair value of plan assets [line items]    
Quoted equities $ 196,682 $ 260,103
Quoted bonds 159,475 158,739
Cash 22,877 3,191
Other 328,678 307,995
Plan assets 707,712 730,028
U.K.    
Disclosure of fair value of plan assets [line items]    
Quoted equities 196,682 260,103
Quoted bonds 159,475 158,739
Cash 22,811 3,123
Other 232,072 220,573
Plan assets 611,040 642,538
GERMANY    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 0 0
Other 13,254 12,599
Plan assets 13,254 12,599
Other    
Disclosure of fair value of plan assets [line items]    
Quoted equities 0 0
Quoted bonds 0 0
Cash 66 68
Other 83,352 74,823
Plan assets $ 83,418 $ 74,891