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Amortization, depreciation and impairment (Tables) | 12 Months Ended
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Sep. 30, 2023
Analysis of income and expense [abstract] |
Disclosure of amortization, depreciation and impairment |
|  | Year ended September 30
|  | 2023 | 2022
|  | $ | $
Depreciation of PP&E (Note 6) |  | 142,653 |  | 133,651 |
Depreciation of right-of-use assets (Note 7) |  | 143,030 |  | 141,295 |
Impairment of right-of-use assets (Note 7) |  | 2,274 |  | 1,495 |
Amortization of contract costs related to transition costs |  | 55,194 |  | 48,594 |
Amortization of intangible assets (Note 9) |  | 162,971 |  | 139,940 |
Impairment of intangible assets (Note 9) |  | — |  | 3,359 |
Included in costs of services, selling and administrative (Note 23) |  | 506,122 |  | 468,334 |
Amortization of contract costs related to incentives (presented as a reduction of revenue) |  | 2,793 |  | 2,201 |
Amortization of deferred financing fees (presented in finance costs) |  | 816 |  | 829 |
Amortization of premiums and discounts on investments related to funds held for clients (presented net as a reduction (increase) of revenue) |  | (1,832) |  | 37 |
Depreciation of PP&E (presented in integration costs) (Note 6) |  | 712 |  | — |
Impairment of PP&E (presented in integration costs) (Note 6) |  | 648 |  | 858 |
Impairment of PP&E (presented in cost optimization program) (Note 6 and 25) |  | 1,938 |  | — |
Impairment of right-of-use assets (presented in integration costs) (Note 7) |  | 5,143 |  | 2,363 |
Impairment of right-of-use assets (presented in cost optimization program) (Note 7 and 25) |  | 2,232 |  | — |
Amortization of intangible assets (presented in integration costs) (Note 9) |  | 1,076 |  | — |
|  | 519,648 |  | 474,622 |

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