v3.26.1
Segment Information - Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) (Details) - CAD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue $ 87,060 $ 116,749  
Operating expenses, net of share-based compensation and non-recurring items(1) [1] (51,919) (49,342)  
Adjusted EBITDA(1) [1] 35,141 67,407  
Share-based compensation (3,129) (3,241)  
Non-recurring items(2) [2] (288) (459)  
Depreciation (22,130) (25,909)  
Amortization (8,611) (10,899)  
Other operating gains (losses), net (82,347) 3,950  
Operating income (81,364) 30,849  
Interest expense (49,958) (56,664)  
Gain (loss) on changes in fair value of financial instruments (15,821) (33,412)  
Interest and other income 4,149 6,208  
Gain (loss) on foreign exchange (17,306) 2,480  
Income (loss) before income taxes (160,300) (50,539)  
Tax (expense) recovery 9,351 (918)  
Net income (loss) (150,949) (51,457) $ (478,760)
Capital expenditures 152,621 178,528  
Broadcast [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 35,710 55,056  
Enterprise [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 48,901 56,843  
Consulting and Other [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 2,449 4,850  
GEO [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 85,628 115,133  
Operating expenses, net of share-based compensation and non-recurring items(1) [1] (30,406) (29,660)  
Adjusted EBITDA(1) [1] 55,222 85,473  
Capital expenditures 646 408  
GEO [Member] | Broadcast [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 35,710 55,056  
GEO [Member] | Enterprise [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 48,836 56,843  
GEO [Member] | Consulting and Other [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 1,082 3,234  
Other [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue [3]  
Operating expenses, net of share-based compensation and non-recurring items(1) [1],[3] (1,808) (1,204)  
Adjusted EBITDA(1) [1],[3] (1,808) (1,204)  
Capital expenditures [3]  
Other [Member] | Broadcast [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue [3]  
Other [Member] | Enterprise [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue [3]  
Other [Member] | Consulting and Other [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue [3]  
LEO [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 1,432 1,616  
Operating expenses, net of share-based compensation and non-recurring items(1) [1] (19,705) (18,478)  
Adjusted EBITDA(1) [1] (18,273) (16,862)  
Capital expenditures 151,975 178,120  
LEO [Member] | Broadcast [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue    
LEO [Member] | Enterprise [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue 65  
LEO [Member] | Consulting and Other [Member]      
Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items]      
Revenue $ 1,367 $ 1,616  
[1] The performance of each segment is evaluated by the CODM based on Adjusted EBITDA. Adjusted EBITDA is defined as operating income (excluding certain operating expenses such as share-based compensation expenses and unusual and non-recurring items, including restructuring related expenses) before interest expense, taxes, depreciation and amortization. Adjusted EBITDA margin is used to measure Telesat’s operating performance.
[2] Non-recurring payments include severance payments and special compensation and benefits.
[3] Transactions that do not belong to a particular operating segment such as certain corporate entities are reported within “Other”.