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Amortization, depreciation and impairment (Tables) | 12 Months Ended
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Sep. 30, 2025
Analysis of income and expense [abstract] |
Disclosure of amortization, depreciation and impairment |
|  | Year ended September 30
|  | 2025 | 2024
|  | $ | $
Depreciation of PP&E (Note 6) |  | 134,243 |  | 134,818 |
Impairment of PP&E (Note 6) |  | — |  | 115 |
Depreciation of right-of-use assets (Note 7) |  | 138,240 |  | 126,615 |
Impairment of right-of-use assets (Note 7) |  | 768 |  | — |
Amortization of contract costs related to transition costs |  | 74,059 |  | 59,191 |
Impairment of contract costs related to transition costs |  | — |  | 4,254 |
Amortization of intangible assets (Note 9) |  | 231,639 |  | 185,741 |
Impairment of intangible assets (Note 9) |  | 6,716 |  | 11,574 |
Included in costs of services, selling and administrative (Note 23) |  | 585,665 |  | 522,308 |
Amortization of contract costs related to incentives (presented as a reduction of revenue) |  | 4,170 |  | 2,806 |
Amortization of deferred financing fees (presented in finance costs) |  | 575 |  | 630 |
Amortization of discounts on investments related to funds held for clients (presented net as an increase of revenue) |  | (39) |  | (1,584) |
Impairment of PP&E (presented in integration costs) (Note 6) |  | 360 |  | 149 |
Impairment of PP&E (presented in restructuring and in cost optimization program) (Note 6 and 25) |  | 1,526 |  | 2,431 |
Impairment of right-of-use assets (presented in integration costs) (Note 7) |  | 19,125 |  | — |
Impairment of right-of-use assets (presented in restructuring and in cost optimization program) (Note 7 and 25) |  | 2,656 |  | 10,119 |
Impairment of intangible assets (presented in restructuring) (Note 9 and 25) |  | 228 |  | — |
|  | 614,266 |  | 536,859 |

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