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Employee benefits - Plan assets and reimbursement rights (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Interest income on plan assets $ (6,101) $ (2,998)
Administration expenses paid from the plan (1,462) (1,784)
Plan assets 730,028 612,111
Reimbursement rights 19,675 19,458
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 631,569 660,846
Interest income on plan assets 35,585 34,555
Employer contributions 12,977 12,631
Return on assets excluding interest income 51,646 (85,683)
Plan participant contributions 248 246
Benefits paid from the plan (31,751) (31,115)
Benefits paid directly by employer (5,721) (6,304)
Administration expenses paid from the plan (1,462) (1,784)
Foreign currency translation adjustment 56,612 48,177
Plan assets 730,028 612,111
Reimbursement rights 19,675 19,458
Net defined benefit asset 749,703 631,569
U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 642,538 536,226
Reimbursement rights 0 0
U.K. | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 536,226 571,909
Interest income on plan assets 30,573 29,902
Employer contributions 426 339
Return on assets excluding interest income 50,973 (84,003)
Plan participant contributions 86 76
Benefits paid from the plan (27,712) (26,527)
Benefits paid directly by employer 0 0
Administration expenses paid from the plan (1,462) (1,779)
Foreign currency translation adjustment 53,428 46,309
Plan assets 642,538 536,226
Reimbursement rights 0 0
Net defined benefit asset 642,538 536,226
France    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 0 0
Reimbursement rights 0 0
France | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 0 0
Interest income on plan assets 0 0
Employer contributions 2,033 2,565
Return on assets excluding interest income 0 0
Plan participant contributions 0 0
Benefits paid from the plan 0 0
Benefits paid directly by employer (2,033) (2,565)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 0 0
Plan assets 0 0
Reimbursement rights 0 0
Net defined benefit asset 0 0
Germany    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 12,599 11,747
Reimbursement rights 19,300 19,082
Germany | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 30,829 29,523
Interest income on plan assets 1,300 1,283
Employer contributions 2,804 2,983
Return on assets excluding interest income (906) (1,668)
Plan participant contributions 0 0
Benefits paid from the plan (503) (229)
Benefits paid directly by employer (3,192) (2,992)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 1,567 1,929
Plan assets 12,599 11,747
Reimbursement rights 19,300 19,082
Net defined benefit asset 31,899 30,829
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 74,891 64,138
Reimbursement rights 375 376
Other | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 64,514 59,414
Interest income on plan assets 3,712 3,370
Employer contributions 7,714 6,744
Return on assets excluding interest income 1,579 (12)
Plan participant contributions 162 170
Benefits paid from the plan (3,536) (4,359)
Benefits paid directly by employer (496) (747)
Administration expenses paid from the plan 0 (5)
Foreign currency translation adjustment 1,617 (61)
Plan assets 74,891 64,138
Reimbursement rights 375 376
Net defined benefit asset $ 75,266 $ 64,514