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Right-of-use assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance $ 482,321  
Ending balance 466,115 $ 482,321
Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 378,889  
Ending balance 359,155 378,889
Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 100,701  
Ending balance 105,888 100,701
Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 2,731  
Ending balance 1,072 2,731
Cost    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,261,354 1,270,298
Additions 88,465 82,685
Additions - business acquisitions 2,341  
Change in estimates and lease modifications 18,422 13,940
Disposals/retirements (157,480) (141,583)
Foreign currency translation adjustment 41,695 36,014
Ending balance 1,254,797 1,261,354
Cost | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,022,910 1,049,445
Additions 46,289 32,772
Additions - business acquisitions 2,341  
Change in estimates and lease modifications 18,422 13,940
Disposals/retirements (81,524) (101,670)
Foreign currency translation adjustment 34,574 28,423
Ending balance 1,043,012 1,022,910
Cost | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 199,501 180,164
Additions 41,968 48,883
Additions - business acquisitions 0  
Change in estimates and lease modifications 0 0
Disposals/retirements (46,014) (36,792)
Foreign currency translation adjustment 6,156 7,246
Ending balance 201,611 199,501
Cost | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 38,943 40,689
Additions 208 1,030
Additions - business acquisitions 0  
Change in estimates and lease modifications 0 0
Disposals/retirements (29,942) (3,121)
Foreign currency translation adjustment 965 345
Ending balance 10,174 38,943
Accumulated depreciation    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (779,033) (735,177)
Disposals/retirements 152,678 129,497
Foreign currency translation adjustment (25,593) (20,674)
Depreciation expense 126,615 143,030
Impairment 10,119 9,649
Ending balance (788,682) (779,033)
Accumulated depreciation | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (644,021) (610,007)
Disposals/retirements 80,766 94,676
Foreign currency translation adjustment (21,285) (15,792)
Depreciation expense 89,198 103,249
Impairment 10,119 9,649
Ending balance (683,857) (644,021)
Accumulated depreciation | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (98,800) (88,923)
Disposals/retirements 41,970 31,700
Foreign currency translation adjustment (3,386) (4,589)
Depreciation expense 35,507 36,988
Impairment 0 0
Ending balance (95,723) (98,800)
Accumulated depreciation | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (36,212) (36,247)
Disposals/retirements 29,942 3,121
Foreign currency translation adjustment (922) (293)
Depreciation expense 1,910 2,793
Impairment 0 0
Ending balance $ (9,102) $ (36,212)