v3.26.1
Financial Instruments - Schedule of Contractual Maturities of Financial Liabilities (Details)
$ in Thousands
Jun. 30, 2026
CAD ($)
Contractual cash flows (undiscounted) [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities $ 8,350,279
Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 3,887,889
2027 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 652,517
2028 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 218,354
2029 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 478,888
2030 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 572,622
Thereafter [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,540,009
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 50,176
Trade and other payables [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 50,176
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] | 2030 [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 1,323
Customer and other deposits [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 455
Customer and other deposits [Member] | 2027 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 531
Customer and other deposits [Member] | 2028 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 176
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] | 2030 [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 161
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 12,789
Satellite performance incentive payments [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 1,708
Satellite performance incentive payments [Member] | 2027 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,716
Satellite performance incentive payments [Member] | 2028 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,595
Satellite performance incentive payments [Member] | 2029 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,595
Satellite performance incentive payments [Member] | 2030 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,595
Satellite performance incentive payments [Member] | Thereafter [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 580
Derivative Liabilities [Member] | Contractual cash flows (undiscounted) [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 1,320,155
Derivative Liabilities [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 1,320,155
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] | 2030 [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
Other financial liabilities [Member] | Contractual cash flows (undiscounted) [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,535
Other financial liabilities [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,535
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] | 2030 [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 6,963,301 [1]
Indebtedness [Member] | Remaining 2026 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,512,860 [1]
Indebtedness [Member] | 2027 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 649,270 [1]
Indebtedness [Member] | 2028 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 215,583 [1]
Indebtedness [Member] | 2029 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 476,293 [1]
Indebtedness [Member] | 2030 [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 570,027 [1]
Indebtedness [Member] | Thereafter [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,539,268 [1]
Carrying amount [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 5,424,601
Carrying amount [Member] | Trade and other payables [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 50,176
Carrying amount [Member] | Customer and other deposits [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 1,323
Carrying amount [Member] | Satellite performance incentive payments [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 10,928
Carrying amount [Member] | Derivative Liabilities [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 1,320,155
Carrying amount [Member] | Other financial liabilities [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities 2,535
Carrying amount [Member] | Indebtedness [Member]  
Schedule of Contractual Maturities of Financial Liabilities [Line items]  
Total contractual maturities of financial liabilities $ 4,039,484 [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.