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Financial instruments - Financial liabilities included in long-term debt (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Disclosure of financial liabilities [line items] |  |
Financial liabilities | $ 7,787,320 | $ 6,011,388
Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,637,835 | 2,688,308
Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,599,707 | 2,549,382
2021 U.S. Senior Notes | Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,386,564 | 1,342,758
2021 U.S. Senior Notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,310,044 | 1,223,120
2021 CAD Senior Notes | Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 597,892 | 597,212
2021 CAD Senior Notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 580,561 | 564,768
2024 CAD Senior Notes | Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 747,001 | 746,144
2024 CAD Senior Notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 766,844 | 759,375
2025 U.S. Senior Notes | Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 894,509 | 0
2025 U.S. Senior Notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 930,366 | 0
Other long-term debt | Carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 11,869 | 2,194
Other long-term debt | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | $ 11,892 | $ 2,119

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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