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v3.25.3

Provisions (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024
Reconciliation of changes in other provisions [abstract] |  |
Beginning balance | $ 46,422,000 |
Additional provisions | 246,308,000 |
Utilized amounts | (104,793,000) |
Reversals of unused amounts | (10,734,000) |
Discount rate adjustment and imputed interest | 433,000 |
Foreign currency translation adjustment | 6,360,000 |
Ending balance | 183,996,000 |
Current portion | 144,331,000 | $ 27,471,000
Non-current portion | 39,665,000 | $ 18,951,000
Severance |  |
Reconciliation of changes in other provisions [abstract] |  |
Beginning balance | 12,003,000 |
Additional provisions | 217,475,000 |
Utilized amounts | (95,650,000) |
Reversals of unused amounts | (3,819,000) |
Discount rate adjustment and imputed interest | 0 |
Foreign currency translation adjustment | 4,307,000 |
Ending balance | 134,316,000 |
Current portion | 119,850,000 |
Non-current portion | 14,466,000 |
Decommissioning liabilities |  |
Reconciliation of changes in other provisions [abstract] |  |
Beginning balance | 20,038,000 |
Additional provisions | 7,719,000 |
Utilized amounts | (647,000) |
Reversals of unused amounts | (628,000) |
Discount rate adjustment and imputed interest | 297,000 |
Foreign currency translation adjustment | 1,159,000 |
Ending balance | 27,938,000 |
Current portion | 6,786,000 |
Non-current portion | 21,152,000 |
Provisions based on expected cash flows | $ 26,718,000 |
Weighted average rate | 1.73% |
Others |  |
Reconciliation of changes in other provisions [abstract] |  |
Beginning balance | $ 14,381,000 |
Additional provisions | 21,114,000 |
Utilized amounts | (8,496,000) |
Reversals of unused amounts | (6,287,000) |
Discount rate adjustment and imputed interest | 136,000 |
Foreign currency translation adjustment | 894,000 |
Ending balance | 21,742,000 |
Current portion | 17,695,000 |
Non-current portion | $ 4,047,000 |
Minimum | Decommissioning liabilities |  |
Reconciliation of changes in other provisions [abstract] |  |
Timing of settlements | 1 year |
Maximum | Decommissioning liabilities |  |
Reconciliation of changes in other provisions [abstract] |  |
Timing of settlements | 15 years |

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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_b&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 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&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 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_e&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 257 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_e&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 257 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84&doctype=Standard -URIDate 2025-03-27 + Details
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