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Indebtedness - Schedule of Indebtedness (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs |  | $ 3,408,172 | $ 3,098,058
Deferred financing costs, prepayment options, warrants and loss on repayment |  | (99,040) | (1,443)
Total |  | 3,309,132 | 3,096,615
Less: current indebtedness |  |  |
Long-term indebtedness |  | 3,309,132 | 3,096,615
2027 Senior Unsecured Notes [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [1] | 296,545 | 318,246
2026 Senior Secured Notes [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [2] | 538,769 | 566,728
2027 Senior Secured Notes [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [3] | 313,192 | 323,633
Government of Canada Telesat Lightspeed Financing [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [4] | 355,111 |
Government of Quebec Telesat Lightspeed Financing [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [4] | 66,376 |
Senior Secured Credit Facilities [Member] | Term Loan B – U.S. Facility [Member] |  |  |
Schedule of Indebtedness [Line Items] |  |  |
Borrowings before deferred financing costs | [5] | $ 1,838,179 | $ 1,889,451
[1] | On October 11, 2019, Telesat Canada issued, through a private placement, US$550 million of 6.5% Senior Unsecured Notes, maturing in October 2027 (“2027 Senior Unsecured Notes”). During the nine months ended September 30, 2025, Telesat repurchased 2027 Senior Unsecured Notes, with a principal amount of $11.4 million (US$8.2 million) in exchange for $4.5 million (US$3.3 million). There were no repurchases during the three months ended September 30, 2025. During the three and nine months ended September 30, 2024, Telesat repurchased 2027 Senior Unsecured Notes, with a principal amount of $100.4 million (US$73.8 million) in exchange for $30.4 million (US$22.3 million).
[2] | On April 27, 2021, Telesat Canada issued, through a private placement, US$500 million in aggregate principal amount of 5.625% Senior Secured Notes maturing in December 2026 (“2026 Senior Secured Notes”). During the three and nine months ended September 30, 2024, Telesat repurchased 2026 Senior Secured Notes with a principal amount of $16.4 million (US$12.0 million) in exchange for $8.0 million (US$5.9 million). There were no repurchases during the three and nine months ended September 30, 2025.
[3] | On December 6, 2019, Telesat Canada issued, through a private placement, US$400 million 4.875% Senior Secured Notes, maturing in June 2027 (“2027 Senior Secured Notes”). During the nine months ended September 30, 2024, Telesat repurchased 2027 Senior Secured Notes with a principal amount of $103.3 million (US$75.0 million) in exchange for $48.4 million (US$35.1 million). There were no repurchases during the three and nine months ended September 30, 2025 or the three months ended September 30, 2024.
[4] | On September 13, 2024, Telesat LEO entered into loan agreements with 16342451 Canada Inc., a subsidiary of Canada Development Investment Corporation (“Government of Canada”) and Investissement Quebec (“Government of Quebec”), for senior secured non-revolving delayed draw term loan facilities in the principal amount of $2,140 million and $400 million, respectively (“Telesat Lightspeed Financing”). Three advances were received during the nine months ended September 30, 2025 totaling $341.2 million from the Government of Canada and $63.8 million from the Government of Quebec. One advance was received in the three months ended September 30, 2025 totaling $54.7 million from the Government of Canada and $10.3 million from the Government of Quebec. The debt balances include $16.3 million of interest that was added to the principal balance of the loan. On October 29, 2025, Telesat LEO received an additional advance of $113.7 million from the Government of Canada and $21.3 million from the Government of Quebec.
[5] | On December 6, 2019, Telesat Canada entered into a new amended and restated Credit Agreement with a syndicate of banks which provides for the extension of credit under the Senior Secured Credit Facilities (“Senior Secured Credit Facilities”). The Senior Secured Credit Facilities are comprised of two tranches — a revolving credit facility of up to $200.0 million US dollars which matured in December 2024 and Term Loan B — U.S. Facility of US$1,908.5 million maturing in December 2026. During the nine months ended September 30, 2024, Telesat repurchased a portion of Term Loan B — U.S. Facility with a principal amount of $121.1 million (US$88.7 million) in exchange for $61.1 million (US$44.8 million). Of this balance, Telesat repurchased a portion of Term Loan B — U.S. Facility in the three months ended September 30, 2024 with a principal amount of $40.9 million (US$30.0 million) in exchange for $19.4 million (US$14.3 million).

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