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Right-of-use assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance $ 466,115  
Ending balance 541,987 $ 466,115
Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 359,155  
Ending balance 419,210 359,155
Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 105,888  
Ending balance 121,248 105,888
Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,072  
Ending balance 1,529 1,072
Cost    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,254,797 1,261,354
Additions 123,864 88,465
Additions - business acquisitions 66,496 2,341
Change in estimates and lease modifications 25,972 18,422
Disposals/retirements (157,667) (157,480)
Foreign currency translation adjustment 69,453 41,695
Ending balance 1,382,915 1,254,797
Cost | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 1,043,012 1,022,910
Additions 68,633 46,289
Additions - business acquisitions 65,561 2,341
Change in estimates and lease modifications 25,972 18,422
Disposals/retirements (98,942) (81,524)
Foreign currency translation adjustment 57,560 34,574
Ending balance 1,161,796 1,043,012
Cost | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 201,611 199,501
Additions 53,803 41,968
Additions - business acquisitions 935 0
Change in estimates and lease modifications 0 0
Disposals/retirements (52,781) (46,014)
Foreign currency translation adjustment 11,460 6,156
Ending balance 215,028 201,611
Cost | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance 10,174 38,943
Additions 1,428 208
Additions - business acquisitions 0 0
Change in estimates and lease modifications 0 0
Disposals/retirements (5,944) (29,942)
Foreign currency translation adjustment 433 965
Ending balance 6,091 10,174
Accumulated depreciation    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (788,682) (779,033)
Disposals/retirements 150,876 152,678
Foreign currency translation adjustment (42,333) (25,593)
Depreciation expense 138,240 126,615
Impairment 22,549 10,119
Ending balance (840,928) (788,682)
Accumulated depreciation | Properties    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (683,857) (644,021)
Disposals/retirements 98,605 80,766
Foreign currency translation adjustment (36,590) (21,285)
Depreciation expense 98,195 89,198
Impairment 22,549 10,119
Ending balance (742,586) (683,857)
Accumulated depreciation | Motor vehicles and others    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (95,723) (98,800)
Disposals/retirements 46,327 41,970
Foreign currency translation adjustment (5,223) (3,386)
Depreciation expense 39,161 35,507
Impairment 0 0
Ending balance (93,780) (95,723)
Accumulated depreciation | Computer equipment    
Reconciliation Of Changes In Right-Of-Use Assets [Abstract]    
Beginning balance (9,102) (36,212)
Disposals/retirements 5,944 29,942
Foreign currency translation adjustment (520) (922)
Depreciation expense 884 1,910
Impairment 0 0
Ending balance $ (4,562) $ (9,102)