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Financial Instruments - Schedule of Contractual Maturities of Financial Liabilities (Details) $ in Thousands | Sep. 30, 2025 CAD ($)
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Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | $ 8,030,600 |
2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 193,542 |
2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,571,356 |
2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 639,310 |
2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 225,894 |
2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 492,334 |
Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 3,908,164 |
Trade and other payables [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 111,577 |
Trade and other payables [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 111,577 |
Trade and other payables [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Trade and other payables [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Trade and other payables [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Trade and other payables [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Trade and other payables [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Customer and other deposits [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 1,380 |
Customer and other deposits [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 610 |
Customer and other deposits [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 475 |
Customer and other deposits [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Customer and other deposits [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Customer and other deposits [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Customer and other deposits [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 295 |
Satellite performance incentive payments [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 15,214 |
Satellite performance incentive payments [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 863 |
Satellite performance incentive payments [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 3,485 |
Satellite performance incentive payments [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,663 |
Satellite performance incentive payments [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,545 |
Satellite performance incentive payments [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,545 |
Satellite performance incentive payments [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 3,113 |
Derivative liabilities [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 726,941 |
Derivative liabilities [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Derivative liabilities [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Derivative liabilities [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Derivative liabilities [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Derivative liabilities [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Derivative liabilities [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 726,941 |
Other financial liabilities [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,414 |
Other financial liabilities [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,414 |
Other financial liabilities [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Other financial liabilities [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Other financial liabilities [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Other financial liabilities [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Other financial liabilities [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities |  |
Indebtedness [Member] | Contractual cash flows (undiscounted) [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 7,173,074 | [1]
Indebtedness [Member] | 2025 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 78,078 | [1]
Indebtedness [Member] | 2026 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,567,396 | [1]
Indebtedness [Member] | 2027 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 636,647 | [1]
Indebtedness [Member] | 2028 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 223,349 | [1]
Indebtedness [Member] | 2029 [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 489,789 | [1]
Indebtedness [Member] | Thereafter [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 3,177,815 | [1]
Carrying amount [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 4,299,120 |
Carrying amount [Member] | Trade and other payables [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 111,577 |
Carrying amount [Member] | Customer and other deposits [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 1,380 |
Carrying amount [Member] | Satellite performance incentive payments [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 12,776 |
Carrying amount [Member] | Derivative liabilities [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 726,941 |
Carrying amount [Member] | Other financial liabilities [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | 2,414 |
Carrying amount [Member] | Indebtedness [Member] |  |
Schedule of Contractual Maturities of Financial Liabilities [Line items] |  |
Total contractual maturities of financial liabilities | $ 3,444,032 | [1]
[1] | Indebtedness excludes deferred financing costs, prepayment options, warrants and loss on repayment. The contractual cash flows for Telesat Lightspeed Financing include anticipated future drawings and mandatory repayments against the loan.

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