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Intangible assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance $ 615,959  
Ending balance 623,103 $ 615,959
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 2,387,420 2,203,586
Additions 174,798 137,980
Measurement period adjustment (8,951)  
Additions - business acquisitions   110,647
Disposals/retirements (62,005) (63,005)
Foreign currency translation adjustment 27,584 (1,788)
Ending balance 2,518,846 2,387,420
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,771,461) (1,696,793)
Disposals/retirements 62,005 63,005
Foreign currency translation adjustment (22,240) 5,626
Amortization expense 164,047 139,940
Impairment   3,359
Ending balance (1,895,743) (1,771,461)
Software | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 49,301  
Ending balance 53,435 49,301
Software | Acquired | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 238,940 246,584
Additions 33,963 23,400
Measurement period adjustment 0  
Additions - business acquisitions   3,479
Disposals/retirements (49,103) (29,419)
Foreign currency translation adjustment 4,873 (5,104)
Ending balance 228,673 238,940
Software | Acquired | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (189,639) (196,504)
Disposals/retirements 49,103 29,419
Foreign currency translation adjustment (4,227) 4,049
Amortization expense 30,475 26,603
Impairment   0
Ending balance (175,238) (189,639)
Software internally developed | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 39,163  
Ending balance 35,038 39,163
Software internally developed | Internally developed | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 104,486 98,891
Additions 9,130 10,111
Measurement period adjustment 0  
Additions - business acquisitions   0
Disposals/retirements (3,900) (2,647)
Foreign currency translation adjustment 509 (1,869)
Ending balance 110,225 104,486
Software internally developed | Internally developed | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (65,323) (53,834)
Disposals/retirements 3,900 2,647
Foreign currency translation adjustment (343) 1,094
Amortization expense 13,421 14,711
Impairment   519
Ending balance (75,187) (65,323)
Business solutions | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 5,486  
Ending balance 22,185 5,486
Business solutions | Acquired | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 78,580 78,641
Additions 19,811 1,160
Measurement period adjustment 0  
Additions - business acquisitions   1,630
Disposals/retirements (9,002) (2,007)
Foreign currency translation adjustment 750 (844)
Ending balance 90,139 78,580
Business solutions | Acquired | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (73,094) (72,731)
Disposals/retirements 9,002 2,007
Foreign currency translation adjustment (588) 831
Amortization expense 3,274 3,201
Impairment   0
Ending balance (67,954) (73,094)
Business solutions | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 325,723  
Ending balance 367,278 325,723
Business solutions | Internally developed | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 734,021 624,850
Additions 111,894 103,309
Measurement period adjustment 0  
Additions - business acquisitions   0
Disposals/retirements 0 (28,932)
Foreign currency translation adjustment (4,175) 34,794
Ending balance 841,740 734,021
Business solutions | Internally developed | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (408,298) (365,597)
Disposals/retirements 0 28,932
Foreign currency translation adjustment 2,889 (20,582)
Amortization expense 69,053 48,211
Impairment   2,840
Ending balance (474,462) (408,298)
Client relationships    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 196,286  
Ending balance 145,167 196,286
Client relationships | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 1,231,393 1,154,620
Additions 0 0
Measurement period adjustment (8,951)  
Additions - business acquisitions   105,538
Disposals/retirements 0 0
Foreign currency translation adjustment 25,627 (28,765)
Ending balance 1,248,069 1,231,393
Client relationships | Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,035,107) (1,008,127)
Disposals/retirements 0 0
Foreign currency translation adjustment (19,971) 20,234
Amortization expense 47,824 47,214
Impairment   0
Ending balance $ (1,102,902) $ (1,035,107)