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Contract costs (Tables) | 12 Months Ended
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Sep. 30, 2025
Revenue From Contracts With Customers [Abstract] |
Disclosure of contract costs |
| As at September 30, 2025 | As at September 30, 2024
| Cost | Accumulated amortization and impairment | Net carrying amount | Cost | Accumulated amortization and impairment | Net carrying amount
| $ | $ | $ | $ | $ | $
Transition costs | 690,012 |  | 323,563 |  | 366,449 |  | 610,971 |  | 274,243 |  | 336,728 |
Incentives | 18,757 |  | 14,274 |  | 4,483 |  | 51,045 |  | 43,744 |  | 7,301 |
| 708,769 |  | 337,837 |  | 370,932 |  | 662,016 |  | 317,987 |  | 344,029 |

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