v3.26.1
Earnings Per Share - Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items]        
Basic total weighted average number of Telesat Corporation Shares outstanding 15,219,358 14,684,485 14,915,651 14,503,290
Diluted total weighted average number of Telesat Corporation Shares outstanding 15,219,358 16,562,440 14,915,651 16,328,156
Stock options [Member]        
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items]        
Effect of diluted securities 341,237 352,789
RSUs [Member]        
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items]        
Effect of diluted securities 774,036 775,331
DSUs [Member]        
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items]        
Effect of diluted securities 205,344 202,875
PSUs [Member]        
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items]        
Effect of diluted securities 557,338 493,871