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Financial Instruments - Schedule of Contractual Maturities of Financial Liabilities (Details)
$ in Thousands
Sep. 30, 2025
CAD ($)
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.