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Right-of-use assets
 12 Months Ended
Sep. 30, 2023
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, 2022 1,049,445  180,164  40,689  1,270,298 
 Additions 32,772  48,883  1,030  82,685 
 Change in estimates and lease modifications 13,940  —  —  13,940 
 Disposals/retirements
 (101,670) (36,792) (3,121) (141,583)
 Foreign currency translation adjustment 28,423  7,246  345  36,014 
As at September 30, 2023 1,022,910  199,501  38,943  1,261,354 
 Accumulated depreciation
As at September 30, 2022 610,007  88,923  36,247  735,177 
 Depreciation expense (Note 24)
 103,249  36,988  2,793  143,030 
 Impairment (Note 24)
 9,649  —  —  9,649 
 Disposals/retirements
 (94,676) (31,700) (3,121) (129,497)
 Foreign currency translation adjustment
 15,792  4,589  293  20,674 
As at September 30, 2023 644,021  98,800  36,212  779,033 
Net carrying amount as at September 30, 2023 378,889  100,701  2,731  482,321 
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 27c)
 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