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Right-of-use assets
 12 Months Ended
Sep. 30, 2022
Right-Of-Use Assets [Abstract]  
Right-of-use assets Right-of-use assets
Properties Motor vehicles and others Computer
equipment		 Total
$ $ $ $
 Cost
As at September 30, 2021 1,080,867  174,354  39,093  1,294,314 
 Additions 90,830  25,554  3,683  120,067 
 Additions - business acquisitions (Note 26a)
 21,622  492  —  22,114 
 Change in estimates and lease modifications (7,946) —  —  (7,946)
 Disposals/retirements
 (88,546) (11,704) —  (100,250)
 Foreign currency translation adjustment (47,382) (8,532) (2,087) (58,001)
As at September 30, 2022 1,049,445  180,164  40,689  1,270,298 
 Accumulated depreciation
As at September 30, 2021 606,558  67,975  33,574  708,107 
 Depreciation expense (Note 24)
 103,489  33,260  4,546  141,295 
 Impairment (Note 24)
 3,858  —  —  3,858 
 Disposals/retirements
 (74,973) (7,749) —  (82,722)
 Foreign currency translation adjustment
 (28,925) (4,563) (1,873) (35,361)
As at September 30, 2022 610,007  88,923  36,247  735,177 
Net carrying amount as at September 30, 2022 439,438  91,241  4,442  535,121 
Properties Motor vehicles and others Computer
equipment		 Total
$ $ $ $
 Cost
As at September 30, 2020 1,124,258  233,976  40,965  1,399,199 
 Additions
 60,318  21,955  828  83,101 
 Additions - business acquisitions (Note 26b)
 4,982  —  —  4,982 
 Change in estimates and lease modifications
 33,774  —  —  33,774 
 Disposals/retirements
 (99,373) (73,190) (2,183) (174,746)
 Foreign currency translation adjustment
 (43,092) (8,387) (517) (51,996)
As at September 30, 2021 1,080,867  174,354  39,093  1,294,314 
 Accumulated depreciation
As at September 30, 2020 605,155  97,573  29,606  732,334 
 Depreciation expense (Note 24)
 111,899  41,766  6,575  160,240 
 Impairment (Note 24)
 1,467  —  —  1,467 
 Disposals/retirements
 (87,557) (67,464) (2,183) (157,204)
 Foreign currency translation adjustment
 (24,406) (3,900) (424) (28,730)
As at September 30, 2021 606,558  67,975  33,574  708,107 
Net carrying amount as at September 30, 2021 474,309  106,379  5,519  586,207