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Employee benefits - Plan assets and reimbursement rights (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance $ (77,010)  
Interest income on plan assets 51 $ 1,005
Administration expenses paid from the plan 1,575 1,408
Defined benefit liability (asset), ending balance (89,097) (77,010)
Plan assets 616,553 1,036,294
Reimbursement rights 18,877 21,250
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 1,057,544 1,048,457
Interest income on plan assets 21,082 16,523
Employer contributions 9,412 15,243
Return on assets excluding interest income (326,053) 34,479
Plan participant contributions 473 485
Benefits paid from the plan (31,708) (34,510)
Benefits paid directly by employer (5,032) (7,688)
Administration expenses paid from the plan (1,575) (1,408)
Foreign currency translation adjustment (88,713) (14,037)
Defined benefit liability (asset), ending balance 635,430 1,057,544
Plan assets 616,553 1,036,294
Reimbursement rights 18,877 21,250
U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 105,351  
Defined benefit liability (asset), ending balance 46,647 105,351
Plan assets 571,909 986,359
Reimbursement rights 0 0
U.K. | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 986,359 977,137
Interest income on plan assets 18,901 14,795
Employer contributions 1,007 1,640
Return on assets excluding interest income (324,003) 32,252
Plan participant contributions 80 92
Benefits paid from the plan (24,018) (29,936)
Benefits paid directly by employer 0 0
Administration expenses paid from the plan (1,568) (1,400)
Foreign currency translation adjustment (84,849) (8,221)
Defined benefit liability (asset), ending balance 571,909 986,359
Plan assets 571,909 986,359
Reimbursement rights 0 0
France    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance (76,345)  
Defined benefit liability (asset), ending balance (77,477) (76,345)
Plan assets 0 661
Reimbursement rights 0 0
France | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 661 692
Interest income on plan assets 0 5
Employer contributions 1,318 2,492
Return on assets excluding interest income 0 7
Plan participant contributions 0 0
Benefits paid from the plan (622) 0
Benefits paid directly by employer (1,318) (2,492)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment (39) (43)
Defined benefit liability (asset), ending balance 0 661
Plan assets 0 661
Reimbursement rights 0 0
Germany    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance (61,324)  
Defined benefit liability (asset), ending balance (31,897) (61,324)
Plan assets 11,028 12,234
Reimbursement rights 18,495 20,823
Germany | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 33,057 35,271
Interest income on plan assets 274 216
Employer contributions 2,638 3,462
Return on assets excluding interest income (214) 384
Plan participant contributions 0 0
Benefits paid from the plan (647) (1,053)
Benefits paid directly by employer (2,848) (2,954)
Administration expenses paid from the plan 0 0
Foreign currency translation adjustment (2,737) (2,269)
Defined benefit liability (asset), ending balance 29,523 33,057
Plan assets 11,028 12,234
Reimbursement rights 18,495 20,823
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance (44,692)  
Defined benefit liability (asset), ending balance (26,370) (44,692)
Plan assets 33,616 37,040
Reimbursement rights 382 427
Other | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 37,467 35,357
Interest income on plan assets 1,907 1,507
Employer contributions 4,449 7,649
Return on assets excluding interest income (1,836) 1,836
Plan participant contributions 393 393
Benefits paid from the plan (6,421) (3,521)
Benefits paid directly by employer (866) (2,242)
Administration expenses paid from the plan (7) (8)
Foreign currency translation adjustment (1,088) (3,504)
Defined benefit liability (asset), ending balance 33,998 37,467
Plan assets 33,616 37,040
Reimbursement rights $ 382 $ 427