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Earnings Per Share - Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items] |  |  |  |
Basic total weighted average number of Telesat Corporation Shares outstanding | 14,797,243 | 14,046,257 | 14,592,627 | 13,888,334
Effect of diluted securities |  |  |  |
Diluted total weighted average number of Telesat Corporation Shares outstanding | 14,797,243 | 16,059,104 | 14,592,627 | 15,813,555
Stock options [Member] |  |  |  |
Effect of diluted securities |  |  |  |
Effect of diluted securities |  | 48,137 |  | 18,437
RSUs [Member] |  |  |  |
Effect of diluted securities |  |  |  |
Effect of diluted securities |  | 1,173,594 |  | 1,194,740
DSUs [Member] |  |  |  |
Effect of diluted securities |  |  |  |
Effect of diluted securities |  | 168,020 |  | 148,120
PSUs [Member] |  |  |  |
Effect of diluted securities |  |  |  |
Effect of diluted securities |  | 623,096 |  | 563,924

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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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