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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]      
Operating income (loss)   $ 729.2 $ (185.4)
Restructuring, integration and acquisition costs   56.5 131.4
Gain on fair value remeasurement of SIMCOM (Note 7)   (72.6) 0.0
Impairment of goodwill   0.0 568.0
Impairment of technology and other non-financial assets (Note 5) $ 35.7 0.0 35.7
Civil Aviation      
Disclosure of operating segments [line items]      
Impairment of goodwill     0.0
Defense and Security      
Disclosure of operating segments [line items]      
Impairment of goodwill     568.0
Operating segments      
Disclosure of operating segments [line items]      
Operating income (loss)   729.2 (185.4)
Restructuring, integration and acquisition costs   56.5 131.4
Gain on fair value remeasurement of SIMCOM (Note 7)   (72.6) 0.0
Shareholder matters   10.6 0.0
Executive management transition costs   8.3 0.0
Impairment of goodwill   0.0 568.0
Impairment of technology and other non-financial assets (Note 5)   0.0 35.7
Adjusted segment operating income   732.0 549.7
Operating segments | Civil Aviation      
Disclosure of operating segments [line items]      
Operating income (loss)   605.3 442.0
Restructuring, integration and acquisition costs   37.8 106.9
Gain on fair value remeasurement of SIMCOM (Note 7)   (72.6) 0.0
Shareholder matters   6.3 0.0
Executive management transition costs   4.7 0.0
Impairment of goodwill   0.0 0.0
Impairment of technology and other non-financial assets (Note 5)   0.0 0.0
Adjusted segment operating income   581.5 548.9
Operating segments | Defense and Security      
Disclosure of operating segments [line items]      
Operating income (loss)   123.9 (627.4)
Restructuring, integration and acquisition costs   18.7 24.5
Gain on fair value remeasurement of SIMCOM (Note 7)   0.0 0.0
Shareholder matters   4.3 0.0
Executive management transition costs   3.6 0.0
Impairment of goodwill   0.0 568.0
Impairment of technology and other non-financial assets (Note 5)   0.0 35.7
Adjusted segment operating income   $ 150.5 $ 0.8