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Intangible assets (Tables)
 12 Months Ended
Sep. 30, 2025
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 and backlog
5 to 10 years
Software
Software internally developed
 Business solutions acquired Business solutions internally developed Client relationships
and backlog		 Total
$ $ $ $ $ $
Cost
As at September 30, 2024 256,178  113,070  81,776  928,297  1,412,161  2,791,482 
Additions 69,939  7,356  —  94,334  —  171,629 
Business acquisitions (Note 27)
 731  16  —  —  202,954  203,701 
Disposals/retirements (62,037) (5,829) (5,296) (7,837) —  (80,999)
Foreign currency translation adjustment 7,336  1,362  2,762  34,576  79,093  125,129 
As at September 30, 2025 272,147  115,975  79,242  1,049,370  1,694,208  3,210,942 
Accumulated amortization and
impairment
As at September 30, 2024 193,111  84,988  63,320  544,463  1,187,025  2,072,907 
Amortization expense (Note 24)
 55,579  11,710  3,137  83,228  77,985  231,639 
Impairment (Note 24)
 —  —  1,170  5,774  —  6,944 
Disposals/retirements (62,037) (5,829) (5,296) (7,837) —  (80,999)
Foreign currency translation adjustment 4,463  1,045  2,607  18,954  65,376  92,445 
As at September 30, 2025 191,116  91,914  64,938  644,582  1,330,386  2,322,936 
Net carrying amount as at September 30, 2025 81,031  24,061  14,304  404,788  363,822  888,006 
Software
Software internally developed
 Business solutions acquired Business solutions internally developed Client relationships
and backlog		 Total
$ $ $ $ $ $
Cost
As at September 30, 2023 228,673  110,225  90,139  841,740  1,248,069  2,518,846 
Additions 50,534  7,720  —  100,810  —  159,064 
Business acquisitions (Note 27)
 69  —  —  —  124,330  124,399 
Disposals/retirements (26,301) (5,806) (9,672) (20,221) —  (62,000)
Foreign currency translation adjustment 3,203  931  1,309  5,968  39,762  51,173 
As at September 30, 2024 256,178  113,070  81,776  928,297  1,412,161  2,791,482 
Accumulated amortization and
impairment
As at September 30, 2023 175,238  75,187  67,954  474,462  1,102,902  1,895,743 
Amortization expense (Note 24)
 40,088  14,810  3,838  77,701  49,304  185,741 
Impairment (Note 24)
 1,439  131  —  10,004  —  11,574 
Disposals/retirements (26,301) (5,806) (9,672) (20,221) —  (62,000)
Foreign currency translation adjustment 2,647  666  1,200  2,517  34,819  41,849 
As at September 30, 2024 193,111  84,988  63,320  544,463  1,187,025  2,072,907 
Net carrying amount as at September 30, 2024 63,067  28,082  18,456  383,834  225,136  718,575