Indebtedness - Schedule of Indebtedness (Details) - CAD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | $ 3,844,514 | $ 3,660,787 | ||||||||||
| Deferred financing costs, prepayment options, warrants and loss on repayment | (199,702) | (167,180) | ||||||||||
| Total | 3,644,812 | 3,493,607 | ||||||||||
| Less: current indebtedness | (2,374,537) | (2,341,145) | ||||||||||
| Long-term indebtedness | 1,270,275 | 1,152,462 | ||||||||||
| Term Loan B – U.S. Facility [Member] | Telesat GEO Financing [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [1] | 1,837,650 | 1,812,296 | |||||||||
| 2027 Senior Unsecured Notes [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [2] | 296,460 | 292,369 | |||||||||
| 2026 Senior Secured Notes [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [3] | 538,615 | 531,183 | |||||||||
| 2027 Senior Secured Notes [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [4] | 313,103 | 308,783 | |||||||||
| Government Of Canada Telesat Lightspeed Financing [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [5] | 723,460 | 603,376 | |||||||||
| Government Of Quebec Telesat Lightspeed Financing [Member] | ||||||||||||
| Telesat GEO Financing | ||||||||||||
| Borrowings before deferred financing costs | [5] | $ 135,226 | $ 112,780 | |||||||||
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