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Employee benefits - Plan assets and reimbursement rights (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Interest income on plan assets $ (2,998) $ (51)
Administration expenses paid from the plan (1,784) (1,575)
Defined benefit liability (asset), ending balance (143,085) (89,097)
Plan assets 612,111 641,969
Reimbursement rights 19,458 18,877
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 660,846 1,083,946
Interest income on plan assets 34,555 21,303
Employer contributions 12,631 9,412
Return on assets excluding interest income (85,683) (325,220)
Plan participant contributions 246 658
Benefits paid from the plan (31,115) (31,708)
Benefits paid directly by employer (6,304) (5,032)
Administration expenses paid from the plan (1,784) (1,575)
Foreign currency translation adjustment 48,177 (90,938)
Plan assets 612,111 641,969
Reimbursement rights 19,458 18,877
Net defined benefit asset 631,569 660,846
U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), ending balance 593 46,647
Plan assets 536,226 571,909
Reimbursement rights 0 0
U.K. | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 571,909 986,359
Interest income on plan assets 29,902 18,901
Employer contributions 339 1,007
Return on assets excluding interest income (84,003) (324,003)
Plan participant contributions 76 80
Benefits paid from the plan (26,527) (24,018)
Benefits paid directly by employer 0 0
Administration expenses paid from the plan (1,779) (1,568)
Foreign currency translation adjustment 46,309 (84,849)
Plan assets 536,226 571,909
Reimbursement rights 0 0
Net defined benefit asset 536,226 571,909
France    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), ending balance (78,612) (77,477)
Plan assets 0 0
Reimbursement rights 0 0
France | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 0 661
Interest income on plan assets 0 0
Employer contributions 2,565 1,318
Return on assets excluding interest income 0 0
Plan participant contributions 0 0
Benefits paid from the plan 0 (622)
Benefits paid directly by employer (2,565) (1,318)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 0 (39)
Plan assets 0 0
Reimbursement rights 0 0
Net defined benefit asset 0 0
Germany    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), ending balance (36,877) (31,897)
Plan assets 11,747 11,028
Reimbursement rights 19,082 18,495
Germany | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 29,523 33,057
Interest income on plan assets 1,283 274
Employer contributions 2,983 2,638
Return on assets excluding interest income (1,668) (214)
Plan participant contributions 0 0
Benefits paid from the plan (229) (647)
Benefits paid directly by employer (2,992) (2,848)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment 1,929 (2,737)
Plan assets 11,747 11,028
Reimbursement rights 19,082 18,495
Net defined benefit asset 30,829 29,523
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), ending balance (28,189) (26,370)
Plan assets 64,138 59,032
Reimbursement rights 376 382
Other | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset 59,414 63,869
Interest income on plan assets 3,370 2,128
Employer contributions 6,744 4,449
Return on assets excluding interest income (12) (1,003)
Plan participant contributions 170 578
Benefits paid from the plan (4,359) (6,421)
Benefits paid directly by employer (747) (866)
Administration expenses paid from the plan (5) (7)
Foreign currency translation adjustment (61) (3,313)
Plan assets 64,138 59,032
Reimbursement rights 376 382
Net defined benefit asset $ 64,514 $ 59,414