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Summary of significant accounting policies (Tables)
 12 Months Ended
Sep. 30, 2022
Disclosure Of Significant Accounting Policies [Abstract]  
Disclosure of detailed information about property, plant and equipment
Buildings
10 to 40 years
Leasehold improvements Lesser of the useful life or lease term
Furniture, fixtures and equipment
3 to 20 years
Computer equipment
3 to 5 years
Land and
buildings		 Leasehold improvements Furniture, fixtures and equipment Computer equipment Total
$ $ $ $ $
 Cost
As at September 30, 2021 78,907  244,824  150,617  592,892  1,067,240 
 Additions
 5,202  24,040  9,344  117,196  155,782 
 Additions - business acquisitions (Note 26a)
 —  4,776  984  2,404  8,164 
 Disposals/retirements
 (4,116) (6,997) (6,466) (88,261) (105,840)
 Foreign currency translation adjustment (2,622) (3,671) (2,396) (25,506) (34,195)
As at September 30, 2022 77,371  262,972  152,083  598,725  1,091,151 
 Accumulated depreciation
As at September 30, 2021 21,961  156,012  97,693  439,482  715,148 
 Depreciation expense (Note 24)
 2,888  24,127  11,815  94,821  133,651 
 Impairment (Note 24)
 —  858  —  —  858 
 Disposals/retirements
 (893) (6,958) (6,424) (88,261) (102,536)
 Foreign currency translation adjustment
 (489) (3,392) (1,782) (19,915) (25,578)
As at September 30, 2022 23,467  170,647  101,302  426,127  721,543 
Net carrying amount as at September 30, 2022 53,904  92,325  50,781  172,598  369,608 
Land and
buildings		 Leasehold improvements Furniture, fixtures and equipment Computer equipment Total
$ $ $ $ $
 Cost
As at September 30, 2020 79,281  241,542  165,219  661,891  1,147,933 
 Additions 2,000  26,349  10,956  96,418  135,723 
 Additions - business acquisitions (Note 26b)
 —  1,200  208  414  1,822 
 Disposals/retirements
 —  (15,284) (20,238) (142,724) (178,246)
 Foreign currency translation adjustment (2,374) (8,983) (5,528) (23,107) (39,992)
As at September 30, 2021 78,907  244,824  150,617  592,892  1,067,240 
 Accumulated depreciation
As at September 30, 2020 20,124  150,572  108,060  496,231  774,987 
 Depreciation expense (Note 24)
 2,590  25,512  13,547  102,774  144,423 
 Impairment (Note 24)
 —  612  50  451  1,113 
 Disposals/retirements
 —  (15,284) (20,238) (142,724) (178,246)
 Foreign currency translation adjustment
 (753) (5,400) (3,726) (17,250) (27,129)
As at September 30, 2021 21,961  156,012  97,693  439,482  715,148 
Net carrying amount as at September 30, 2021 56,946  88,812  52,924  153,410  352,092 
Disclosure of estimated useful lives of intangible assets
Internal-use software
2 to 7 years
Business solutions
3 to 10 years
Software licenses
3 to 8 years
Client relationships
5 to 7 years
Internal-use software acquired Internal-use software internally developed Business solutions acquired Business solutions internally developed Software
licenses		 Client relationships Total
$ $ $ $ $ $ $
 Cost
As at September 30, 2021 79,210  98,891  78,641  624,850  167,374  1,154,620  2,203,586 
Additions
 1,385  10,111  1,160  103,309  22,015  —  137,980 
Additions - business acquisitions (Note 26a)
 3,176  —  1,630  —  303  105,538  110,647 
Disposals/retirements
 (6,399) (2,647) (2,007) (28,932) (23,020) —  (63,005)
Foreign currency translation adjustment
 (1,410) (1,869) (844) 34,794  (3,694) (28,765) (1,788)
As at September 30, 2022 75,962  104,486  78,580  734,021  162,978  1,231,393  2,387,420 
 Accumulated amortization and
    impairment
As at September 30, 2021 72,303  53,834  72,731  365,597  124,201  1,008,127  1,696,793 
Amortization expense (Note 24)
 4,948  14,711  3,201  48,211  21,655  47,214  139,940 
Impairment (Note 24)
 —  519  —  2,840  —  —  3,359 
Disposals/retirements
 (6,399) (2,647) (2,007) (28,932) (23,020) —  (63,005)
Foreign currency translation adjustment
 (1,230) (1,094) (831) 20,582  (2,819) (20,234) (5,626)
As at September 30, 2022 69,622  65,323  73,094  408,298  120,017  1,035,107  1,771,461 
Net carrying amount as at September 30,
    2022		 6,340  39,163  5,486  325,723  42,961  196,286  615,959 
Internal-use software acquired Internal-use software internally developed Business solutions acquired Business solutions internally developed Software
licenses		 Client relationships Total
$ $ $ $ $ $ $
 Cost
As at September 30, 2020 96,900  131,298  76,278  571,015  190,372  1,187,862  2,253,725 
Additions
 107  7,712  —  85,572  21,086  —  114,477 
Additions - business acquisitions (Note 26b)
 —  —  8,081  —  —  14,026  22,107 
Disposals/retirements
 (16,427) (39,284) (3,242) (9,041) (39,656) —  (107,650)
Foreign currency translation adjustment
 (1,370) (835) (2,476) (22,696) (4,428) (47,268) (79,073)
As at September 30, 2021 79,210  98,891  78,641  624,850  167,374  1,154,620  2,203,586 
 Accumulated amortization and
     impairment
As at September 30, 2020 84,431  79,745  75,170  338,122  142,456  1,012,339  1,732,263 
Amortization expense (Note 24)
 5,464  13,882  3,043  44,439  24,963  38,070  129,861 
Impairment (Note 24)
 —  —  —  4,121  —  —  4,121 
Disposals/retirements
 (16,427) (39,284) (3,242) (9,041) (39,656) —  (107,650)
Foreign currency translation adjustment
 (1,165) (509) (2,240) (12,044) (3,562) (42,282) (61,802)
As at September 30, 2021 72,303  53,834  72,731  365,597  124,201  1,008,127  1,696,793 
Net carrying amount as at September 30,
    2021		 6,907  45,057  5,910  259,253  43,173  146,493  506,793