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Intangible assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance $ 506,793  
Ending balance 615,959 $ 506,793
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 2,203,586 2,253,725
Additions 137,980 114,477
Additions - business acquisitions 110,647 22,107
Disposals/retirements (63,005) (107,650)
Foreign currency translation adjustment (1,788) (79,073)
Ending balance 2,387,420 2,203,586
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,696,793) (1,732,263)
Disposals/retirements 63,005 107,650
Foreign currency translation adjustment 5,626 61,802
Amortization expense (Note 24) 139,940 129,861
Impairment (Note 24) 3,359 4,121
Ending balance (1,771,461) (1,696,793)
Internal-use software | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 6,907  
Ending balance 6,340 6,907
Internal-use software | Acquired | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 79,210 96,900
Additions 1,385 107
Additions - business acquisitions 3,176 0
Disposals/retirements (6,399) (16,427)
Foreign currency translation adjustment (1,410) (1,370)
Ending balance 75,962 79,210
Internal-use software | Acquired | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (72,303) (84,431)
Disposals/retirements 6,399 16,427
Foreign currency translation adjustment 1,230 1,165
Amortization expense (Note 24) 4,948 5,464
Impairment (Note 24) 0 0
Ending balance (69,622) (72,303)
Internal-use software | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 45,057  
Ending balance 39,163 45,057
Internal-use software | Internally developed | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 98,891 131,298
Additions 10,111 7,712
Additions - business acquisitions 0 0
Disposals/retirements (2,647) (39,284)
Foreign currency translation adjustment (1,869) (835)
Ending balance 104,486 98,891
Internal-use software | Internally developed | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (53,834) (79,745)
Disposals/retirements 2,647 39,284
Foreign currency translation adjustment 1,094 509
Amortization expense (Note 24) 14,711 13,882
Impairment (Note 24) 519 0
Ending balance (65,323) (53,834)
Business solutions | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 5,910  
Ending balance 5,486 5,910
Business solutions | Acquired | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 78,641 76,278
Additions 1,160 0
Additions - business acquisitions 1,630 8,081
Disposals/retirements (2,007) (3,242)
Foreign currency translation adjustment (844) (2,476)
Ending balance 78,580 78,641
Business solutions | Acquired | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (72,731) (75,170)
Disposals/retirements 2,007 3,242
Foreign currency translation adjustment 831 2,240
Amortization expense (Note 24) 3,201 3,043
Impairment (Note 24) 0 0
Ending balance (73,094) (72,731)
Business solutions | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 259,253  
Ending balance 325,723 259,253
Business solutions | Internally developed | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 624,850 571,015
Additions 103,309 85,572
Additions - business acquisitions 0 0
Disposals/retirements (28,932) (9,041)
Foreign currency translation adjustment 34,794 (22,696)
Ending balance 734,021 624,850
Business solutions | Internally developed | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (365,597) (338,122)
Disposals/retirements 28,932 9,041
Foreign currency translation adjustment (20,582) 12,044
Amortization expense (Note 24) 48,211 44,439
Impairment (Note 24) 2,840 4,121
Ending balance (408,298) (365,597)
Software licenses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 43,173  
Ending balance 42,961 43,173
Software licenses | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 167,374 190,372
Additions 22,015 21,086
Additions - business acquisitions 303 0
Disposals/retirements (23,020) (39,656)
Foreign currency translation adjustment (3,694) (4,428)
Ending balance 162,978 167,374
Software licenses | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (124,201) (142,456)
Disposals/retirements 23,020 39,656
Foreign currency translation adjustment 2,819 3,562
Amortization expense (Note 24) 21,655 24,963
Impairment (Note 24) 0 0
Ending balance (120,017) (124,201)
Client relationships    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 146,493  
Ending balance 196,286 146,493
Client relationships | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 1,154,620 1,187,862
Additions 0 0
Additions - business acquisitions 105,538 14,026
Disposals/retirements 0 0
Foreign currency translation adjustment (28,765) (47,268)
Ending balance 1,231,393 1,154,620
Client relationships | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,008,127) (1,012,339)
Disposals/retirements 0 0
Foreign currency translation adjustment 20,234 42,282
Amortization expense (Note 24) 47,214 38,070
Impairment (Note 24) 0 0
Ending balance $ (1,035,107) $ (1,008,127)