v3.26.1
Financial Instruments (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financial Instruments [Line Items]      
Maximum exposure to credit risk $ 599,100   $ 586,900
Allowance for doubtful accounts 14,900   13,800
Borrowings before deferred financing costs 2,985,800   2,944,600
Derivative liabilities $ 848,313   832,432
Rate percentage 5.00%    
Net income loss $ 63,100   70,800
Other comprehensive income loss 70,500   62,000
Cash and cash equivalents $ 14,700    
Cash and cash equivalents     $ 15,500
Discount rate cash flow 6.90%   7.00%
Bottom of range [Member]      
Financial Instruments [Line Items]      
Discount cash flows 4.00%   3.74%
Top of range [Member]      
Financial Instruments [Line Items]      
Discount cash flows 4.01%   3.97%
Telesat Lightspeed Warrants [Member]      
Financial Instruments [Line Items]      
Borrowings before deferred financing costs $ 858,700   $ 716,200
Derivative liabilities 848,300   832,400
Deferred charges $ 404,500   $ 429,100
North American [Member]      
Financial Instruments [Line Items]      
Risk percentage 66%   67%
International Customers [Member]      
Financial Instruments [Line Items]      
Risk percentage 34%   33%
Interest Rates Floor [Member]      
Financial Instruments [Line Items]      
Rate percentage 0.25%    
Net income loss $ 1,600 $ 1,300