v3.25.3
Summary of material accounting policies (Tables)
 12 Months Ended
Sep. 30, 2025
Disclosure Of Material 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 10 years
Computer equipment
3 to 5 years
Land and
buildings		 Leasehold improvements Furniture, fixtures and equipment Computer equipment Total
$ $ $ $ $
Cost
As at September 30, 2024 80,530  253,250  145,201  624,319  1,103,300 
 Additions 2,378  29,004  6,729  81,430  119,541 
 Additions - business acquisitions (Note 27)
 737  7,327  4,130  3,201  15,395 
 Disposals/retirements (2,857) (28,914) (8,566) (85,580) (125,917)
 Foreign currency translation adjustment 2,406  9,194  4,816  26,844  43,260 
As at September 30, 2025 83,194  269,861  152,310  650,214  1,155,579 
Accumulated depreciation
As at September 30, 2024 25,983  173,539  90,258  446,697  736,477 
Depreciation expense (Note 24)
 3,535  25,166  13,219  92,323  134,243 
Impairment (Note 24)
 —  1,532  215  139  1,886 
Disposals/retirements (1,432) (28,914) (8,566) (85,580) (124,492)
Foreign currency translation adjustment 921  7,086  2,751  18,807  29,565 
As at September 30, 2025 29,007  178,409  97,877  472,386  777,679 
Net carrying amount as at September 30, 2025 54,187  91,452  54,433  177,828  377,900 
Land and
buildings		 Leasehold improvements Furniture, fixtures and equipment Computer equipment Total
$ $ $ $ $
Cost
As at September 30, 2023 81,381  256,804  149,271  620,371  1,107,827 
Additions 6,032  17,724  12,253  72,515  108,524 
Additions - business acquisitions (Note 27)
 —  96  196  1,086  1,378 
Disposals/retirements (10,236) (27,142) (19,273) (86,710) (143,361)
Foreign currency translation adjustment 3,353  5,768  2,754  17,057  28,932 
As at September 30, 2024 80,530  253,250  145,201  624,319  1,103,300 
Accumulated depreciation
As at September 30, 2023 26,979  165,260  94,710  431,602  718,551 
Depreciation expense (Note 24)
 2,550  28,974  12,988  90,306  134,818 
Impairment (Note 24)
 115  1,966  465  149  2,695 
Disposals/retirements (4,985) (26,945) (19,273) (86,710) (137,913)
Foreign currency translation adjustment 1,324  4,284  1,368  11,350  18,326 
As at September 30, 2024 25,983  173,539  90,258  446,697  736,477 
Net carrying amount as at September 30, 2024 54,547  79,711  54,943  177,622  366,823 
Disclosure of estimated useful lives of 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