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Employee benefits - Plan assets and reimbursement rights (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of net defined benefit liability (asset) [line items]    
Interest income on plan assets $ (4,221) $ (6,101)
Administration expenses paid from the plan (3,432) (1,462)
Plan assets 707,712 730,028
Reimbursement rights 20,139 19,675
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 749,703 631,569
Interest income on plan assets 36,960 35,585
Employer contributions 16,467 12,977
Return on assets excluding interest income (52,468) 51,646
Plan participant contributions 176 248
Benefits paid from the plan (36,244) (31,751)
Benefits paid directly by employer (7,771) (5,721)
Administration expenses paid from the plan (3,432) (1,462)
Foreign currency translation adjustment 24,460 56,612
Plan assets 707,712 730,028
Reimbursement rights 20,139 19,675
Net defined benefit asset 727,851 749,703
U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 611,040 642,538
Reimbursement rights 0 0
U.K. | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 642,538 536,226
Interest income on plan assets 31,518 30,573
Employer contributions 358 426
Return on assets excluding interest income (48,857) 50,973
Plan participant contributions 57 86
Benefits paid from the plan (32,269) (27,712)
Benefits paid directly by employer 0 0
Administration expenses paid from the plan (3,432) (1,462)
Foreign currency translation adjustment 21,127 53,428
Plan assets 611,040 642,538
Reimbursement rights 0 0
Net defined benefit asset 611,040 642,538
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 2,793 2,033
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 (2,793) (2,033)
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 13,254 12,599
Reimbursement rights 19,752 19,300
GERMANY | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 31,899 30,829
Interest income on plan assets 1,090 1,300
Employer contributions 4,545 2,804
Return on assets excluding interest income (2,975) (906)
Plan participant contributions 0 0
Benefits paid from the plan (156) (503)
Benefits paid directly by employer (4,069) (3,192)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 2,672 1,567
Plan assets 13,254 12,599
Reimbursement rights 19,752 19,300
Net defined benefit asset 33,006 31,899
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets 83,418 74,891
Reimbursement rights 387 375
Other | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 75,266 64,514
Interest income on plan assets 4,352 3,712
Employer contributions 8,771 7,714
Return on assets excluding interest income (636) 1,579
Plan participant contributions 119 162
Benefits paid from the plan (3,819) (3,536)
Benefits paid directly by employer (909) (496)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 661 1,617
Plan assets 83,418 74,891
Reimbursement rights 387 375
Net defined benefit asset $ 83,805 $ 75,266