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Intangible assets (Tables)
 12 Months Ended
Sep. 30, 2023
Intangible assets other than goodwill [abstract]  
Disclosure of detailed information about intangible assets
Software
1 to 8 years
Business solutions
3 to 10 years
Client relationships
5 to 7 years
Software
Software internally developed
 Business solutions acquired Business solutions internally developed Client relationships Total
$ $ $ $ $ $
 Cost
As at September 30, 2022 238,940  104,486  78,580  734,021  1,231,393  2,387,420 
Additions
 33,963  9,130  19,811  111,894  —  174,798 
Business acquisitions (Note 27c)
 —  —  —  —  (8,951) (8,951)
Disposals/retirements
 (49,103) (3,900) (9,002) —  —  (62,005)
Foreign currency translation adjustment
 4,873  509  750  (4,175) 25,627  27,584 
As at September 30, 2023 228,673  110,225  90,139  841,740  1,248,069  2,518,846 
 Accumulated amortization and
    impairment
As at September 30, 2022 189,639  65,323  73,094  408,298  1,035,107  1,771,461 
Amortization expense (Note 24)
 30,475  13,421  3,274  69,053  47,824  164,047 
Disposals/retirements
 (49,103) (3,900) (9,002) —  —  (62,005)
Foreign currency translation adjustment
 4,227  343  588  (2,889) 19,971  22,240 
As at September 30, 2023 175,238  75,187  67,954  474,462  1,102,902  1,895,743 
Net carrying amount as at September 30,
    2023		 53,435  35,038  22,185  367,278  145,167  623,103 
Software
Software internally developed
 Business solutions acquired Business solutions internally developed Client relationships Total
$ $ $ $ $ $
 Cost
As at September 30, 2021 246,584  98,891  78,641  624,850  1,154,620  2,203,586 
Additions
 23,400  10,111  1,160  103,309  —  137,980 
Additions - business acquisitions (Note 27c)
 3,479  —  1,630  —  105,538  110,647 
Disposals/retirements
 (29,419) (2,647) (2,007) (28,932) —  (63,005)
Foreign currency translation adjustment
 (5,104) (1,869) (844) 34,794  (28,765) (1,788)
As at September 30, 2022 238,940  104,486  78,580  734,021  1,231,393  2,387,420 
 Accumulated amortization and
     impairment
As at September 30, 2021 196,504  53,834  72,731  365,597  1,008,127  1,696,793 
Amortization expense (Note 24)
 26,603  14,711  3,201  48,211  47,214  139,940 
Impairment (Note 24)
 —  519  —  2,840  —  3,359 
Disposals/retirements
 (29,419) (2,647) (2,007) (28,932) —  (63,005)
Foreign currency translation adjustment
 (4,049) (1,094) (831) 20,582  (20,234) (5,626)
As at September 30, 2022 189,639  65,323  73,094  408,298  1,035,107  1,771,461 
Net carrying amount as at September 30,
    2022		 49,301  39,163  5,486  325,723  196,286  615,959