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Long-term financial assets | 12 Months Ended
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Sep. 30, 2023
Subclassifications of assets, liabilities and equities [abstract] |
Long-term financial assets | Long-term financial assets
| As at September 30, 2023 | As at September 30, 2022
| $ | $
Deferred compensation plan assets (Notes 17 and 32) | 88,076 |  | 71,863 |
Long-term investments (Note 32) | 17,113 |  | 16,826 |
Long-term receivables | 20,774 |  | 10,590 |
Long-term derivative financial instruments (Note 32) | 22,005 |  | 237,877 |
| 147,968 |  | 337,156 |

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