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Earnings Per Share - Schedule of Basic and Diluted Per Share (Details) - CAD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Basic and Diluted Per Share [Abstract] |  |  |  |
Net income (loss) attributable to Telesat Corporation Shares | $ (35,269) | $ 17,901 | $ (29,811) | $ 38,591
Effect of diluted securities |  | 1,852 |  | 3,789
Diluted net income (loss) attributable to Telesat Corporation Shares | $ (35,269) | $ 19,753 | $ (29,811) | $ 42,380

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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Amount of effect of diluted securities. + References No definition available. + Details
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