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Property, plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 352,092  
Ending balance 369,608 $ 352,092
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,067,240 1,147,933
Additions 155,782 135,723
Additions - business acquisitions 8,164 1,822
Disposals/retirements (105,840) (178,246)
Foreign currency translation adjustment (34,195) (39,992)
Ending balance 1,091,151 1,067,240
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (715,148) (774,987)
Disposals/retirements 102,536 178,246
Foreign currency translation adjustment 25,578 27,129
Depreciation expense (Note 24) 133,651 144,423
Impairment (Note 24) 858 1,113
Ending balance (721,543) (715,148)
Land and buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 56,946  
Ending balance 53,904 56,946
Land and buildings | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 78,907 79,281
Additions 5,202 2,000
Additions - business acquisitions 0 0
Disposals/retirements (4,116) 0
Foreign currency translation adjustment (2,622) (2,374)
Ending balance 77,371 78,907
Land and buildings | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (21,961) (20,124)
Disposals/retirements 893 0
Foreign currency translation adjustment 489 753
Depreciation expense (Note 24) 2,888 2,590
Impairment (Note 24) 0 0
Ending balance (23,467) (21,961)
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 88,812  
Ending balance 92,325 88,812
Leasehold improvements | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 244,824 241,542
Additions 24,040 26,349
Additions - business acquisitions 4,776 1,200
Disposals/retirements (6,997) (15,284)
Foreign currency translation adjustment (3,671) (8,983)
Ending balance 262,972 244,824
Leasehold improvements | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (156,012) (150,572)
Disposals/retirements 6,958 15,284
Foreign currency translation adjustment 3,392 5,400
Depreciation expense (Note 24) 24,127 25,512
Impairment (Note 24) 858 612
Ending balance (170,647) (156,012)
Furniture, fixtures and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 52,924  
Ending balance 50,781 52,924
Furniture, fixtures and equipment | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 150,617 165,219
Additions 9,344 10,956
Additions - business acquisitions 984 208
Disposals/retirements (6,466) (20,238)
Foreign currency translation adjustment (2,396) (5,528)
Ending balance 152,083 150,617
Furniture, fixtures and equipment | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (97,693) (108,060)
Disposals/retirements 6,424 20,238
Foreign currency translation adjustment 1,782 3,726
Depreciation expense (Note 24) 11,815 13,547
Impairment (Note 24) 0 50
Ending balance (101,302) (97,693)
Computer equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 153,410  
Ending balance 172,598 153,410
Computer equipment | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 592,892 661,891
Additions 117,196 96,418
Additions - business acquisitions 2,404 414
Disposals/retirements (88,261) (142,724)
Foreign currency translation adjustment (25,506) (23,107)
Ending balance 598,725 592,892
Computer equipment | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (439,482) (496,231)
Disposals/retirements 88,261 142,724
Foreign currency translation adjustment 19,915 17,250
Depreciation expense (Note 24) 94,821 102,774
Impairment (Note 24) 0 451
Ending balance $ (426,127) $ (439,482)