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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, 2024
Mar. 31, 2023
Disclosure of operating segments [line items]      
Operating income (loss)   $ (185.4) $ 466.0
Restructuring, integration and acquisition costs   131.4 62.6
Impairment of goodwill   568.0 0.0
Impairment of technology and other non-financial assets (Note 5) $ 35.7 35.7 0.0
Impairment reversal of non-financial assets following their repurposing and optimization   0.0 9.8
Civil Aviation      
Disclosure of operating segments [line items]      
Impairment of goodwill   0.0  
Impairment reversal of non-financial assets following their repurposing and optimization     3.0
Defense and Security      
Disclosure of operating segments [line items]      
Impairment of goodwill   568.0  
Impairment reversal of non-financial assets following their repurposing and optimization     6.8
Operating segments      
Disclosure of operating segments [line items]      
Operating income (loss)   (185.4) 466.0
Restructuring, integration and acquisition costs   131.4 62.6
Impairment of goodwill   568.0 0.0
Impairment of technology and other non-financial assets (Note 5)   35.7 0.0
Impairment reversal of non-financial assets following their repurposing and optimization   0.0 9.8
Adjusted segment operating income   549.7 538.4
Operating segments | Civil Aviation      
Disclosure of operating segments [line items]      
Operating income (loss)   442.0 430.3
Restructuring, integration and acquisition costs   106.9 52.0
Impairment of goodwill   0.0 0.0
Impairment of technology and other non-financial assets (Note 5)   0.0 0.0
Impairment reversal of non-financial assets following their repurposing and optimization   0.0 3.0
Adjusted segment operating income   548.9 485.3
Operating segments | Defense and Security      
Disclosure of operating segments [line items]      
Operating income (loss)   (627.4) 35.7
Restructuring, integration and acquisition costs   24.5 10.6
Impairment of goodwill   568.0 0.0
Impairment of technology and other non-financial assets (Note 5)   35.7 0.0
Impairment reversal of non-financial assets following their repurposing and optimization   0.0 6.8
Adjusted segment operating income   $ 0.8 $ 53.1