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Right-of-use assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance $ 586,207  
Ending balance 535,121 $ 586,207
Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 474,309  
Ending balance 439,438 474,309
Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 106,379  
Ending balance 91,241 106,379
Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 5,519  
Ending balance 4,442 5,519
Cost    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,294,314 1,399,199
Additions 120,067 83,101
Additions - business acquisitions 22,114 4,982
Change in estimates and lease modifications (7,946) 33,774
Disposals/retirements (100,250) (174,746)
Foreign currency translation adjustment (58,001) (51,996)
Ending balance 1,270,298 1,294,314
Cost | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,080,867 1,124,258
Additions 90,830 60,318
Additions - business acquisitions 21,622 4,982
Change in estimates and lease modifications (7,946) 33,774
Disposals/retirements (88,546) (99,373)
Foreign currency translation adjustment (47,382) (43,092)
Ending balance 1,049,445 1,080,867
Cost | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 174,354 233,976
Additions 25,554 21,955
Additions - business acquisitions 492 0
Change in estimates and lease modifications 0 0
Disposals/retirements (11,704) (73,190)
Foreign currency translation adjustment (8,532) (8,387)
Ending balance 180,164 174,354
Cost | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 39,093 40,965
Additions 3,683 828
Additions - business acquisitions 0 0
Change in estimates and lease modifications 0 0
Disposals/retirements 0 (2,183)
Foreign currency translation adjustment (2,087) (517)
Ending balance 40,689 39,093
Accumulated depreciation    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (708,107) (732,334)
Disposals/retirements 82,722 157,204
Foreign currency translation adjustment 35,361 28,730
Depreciation expense (Note 24) 141,295 160,240
Impairment (Note 24) 3,858 1,467
Ending balance (735,177) (708,107)
Accumulated depreciation | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (606,558) (605,155)
Disposals/retirements 74,973 87,557
Foreign currency translation adjustment 28,925 24,406
Depreciation expense (Note 24) 103,489 111,899
Impairment (Note 24) 3,858 1,467
Ending balance (610,007) (606,558)
Accumulated depreciation | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (67,975) (97,573)
Disposals/retirements 7,749 67,464
Foreign currency translation adjustment 4,563 3,900
Depreciation expense (Note 24) 33,260 41,766
Impairment (Note 24) 0 0
Ending balance (88,923) (67,975)
Accumulated depreciation | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (33,574) (29,606)
Disposals/retirements 0 2,183
Foreign currency translation adjustment 1,873 424
Depreciation expense (Note 24) 4,546 6,575
Impairment (Note 24) 0 0
Ending balance $ (36,247) $ (33,574)