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Income taxes - Narrative (Details) - CAD ($) | Sep. 30, 2024 | Sep. 30, 2023
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Net deferred tax asset | $ 46,564,000 | $ 49,742,000
Cash and cash equivalents | 1,461,145,000 | 1,568,291,000
Operating tax losses carried forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses carried forward | 195,358,000 | 279,918,000
Deferred tax asset is recognised from loss | 180,647,000 | 187,865,000
Unrecognized losses | 0 | 7,314,000
Non-operating tax losses carried forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses carried forward | 470,177,000 | 424,736,000
Net deferred tax asset | 4,616,000 | 6,336,000
Deferred tax asset is recognised from loss | 17,869,000 | 24,806,000
Unrecognized losses | 452,308,000 | 399,930,000
Expiring at various dates up to 2043 | Operating tax losses carried forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses carried forward | 39,077,000 | 104,113,000
No expiry dates | Operating tax losses carried forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses carried forward | 156,281,000 | 175,805,000
Unrecognized losses | 14,711,000 | 84,739,000
Foreign countries | Total for all subsidiaries |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Cash and cash equivalents | 1,315,252,000 | 1,365,975,000
Undistributed earnings from foreign subsidiaries for which deferred tax liabilities have not been recorded | $ 9,308,421,000 | $ 8,262,337,000

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