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Intangible assets (Tables) | 12 Months Ended
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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 |

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- Definition The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263&doctype=Standard -URIDate 2025-03-27 + Details
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