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Right-of-use assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance $ 535,121  
Ending balance 482,321 $ 535,121
Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 439,438  
Ending balance 378,889 439,438
Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 91,241  
Ending balance 100,701 91,241
Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 4,442  
Ending balance 2,731 4,442
Cost    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,270,298 1,294,314
Additions 82,685 120,067
Additions - business acquisitions   22,114
Change in estimates and lease modifications 13,940 (7,946)
Disposals/retirements (141,583) (100,250)
Foreign currency translation adjustment 36,014 (58,001)
Ending balance 1,261,354 1,270,298
Cost | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,049,445 1,080,867
Additions 32,772 90,830
Additions - business acquisitions   21,622
Change in estimates and lease modifications 13,940 (7,946)
Disposals/retirements (101,670) (88,546)
Foreign currency translation adjustment 28,423 (47,382)
Ending balance 1,022,910 1,049,445
Cost | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 180,164 174,354
Additions 48,883 25,554
Additions - business acquisitions   492
Change in estimates and lease modifications 0 0
Disposals/retirements (36,792) (11,704)
Foreign currency translation adjustment 7,246 (8,532)
Ending balance 199,501 180,164
Cost | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 40,689 39,093
Additions 1,030 3,683
Additions - business acquisitions   0
Change in estimates and lease modifications 0 0
Disposals/retirements (3,121) 0
Foreign currency translation adjustment 345 (2,087)
Ending balance 38,943 40,689
Accumulated depreciation    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (735,177) (708,107)
Disposals/retirements 129,497 82,722
Foreign currency translation adjustment (20,674) 35,361
Depreciation expense 143,030 141,295
Impairment 9,649 3,858
Ending balance (779,033) (735,177)
Accumulated depreciation | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (610,007) (606,558)
Disposals/retirements 94,676 74,973
Foreign currency translation adjustment (15,792) 28,925
Depreciation expense 103,249 103,489
Impairment 9,649 3,858
Ending balance (644,021) (610,007)
Accumulated depreciation | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (88,923) (67,975)
Disposals/retirements 31,700 7,749
Foreign currency translation adjustment (4,589) 4,563
Depreciation expense 36,988 33,260
Impairment 0 0
Ending balance (98,800) (88,923)
Accumulated depreciation | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (36,247) (33,574)
Disposals/retirements 3,121 0
Foreign currency translation adjustment (293) 1,873
Depreciation expense 2,793 4,546
Impairment 0 0
Ending balance $ (36,212) $ (36,247)