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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]    
Integration and acquisition costs $ 66.3 $ 87.8
Impairment reversal of non-financial assets following their repurposing and optimization 9.8 0.0
Defense and Security    
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]    
Impairment reversal of non-financial assets following their repurposing and optimization 6.8  
Civil Aviation    
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]    
Impairment reversal of non-financial assets following their repurposing and optimization 3.0  
L3Harris' Military Training business    
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]    
Integration and acquisition costs 17.6 63.5
Sabre AirCentre airline operations portfolio    
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]    
Integration and acquisition costs $ 48.9 $ 18.1