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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of operating segments [line items]    
Operating income $ 474.0 $ 284.2
Restructuring, integration and acquisition costs 64.3 146.9
Impairment reversal of non-financial assets following their repurposing and optimization 9.8 0.0
Cloud computing transition adjustment (Note 4) 0.0 13.4
Civil Aviation    
Disclosure of operating segments [line items]    
Impairment reversal of non-financial assets following their repurposing and optimization 3.0  
Cloud computing transition adjustment (Note 4)   11.6
Defense and Security    
Disclosure of operating segments [line items]    
Impairment reversal of non-financial assets following their repurposing and optimization 6.8  
Operating segments    
Disclosure of operating segments [line items]    
Operating income 474.0 284.2
Restructuring, integration and acquisition costs 64.3 146.9
Impairment reversal of non-financial assets following their repurposing and optimization 9.8 0.0
Cloud computing transition adjustment (Note 4) 0.0 13.4
Adjusted segment operating income 548.1 444.5
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
Operating income 430.3 224.1
Restructuring, integration and acquisition costs 52.0 79.0
Impairment reversal of non-financial assets following their repurposing and optimization 3.0 0.0
Cloud computing transition adjustment (Note 4) 0.0  
Adjusted segment operating income 485.3 314.7
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Operating income 35.7 56.0
Restructuring, integration and acquisition costs 10.6 61.4
Impairment reversal of non-financial assets following their repurposing and optimization 6.8 0.0
Cloud computing transition adjustment (Note 4) 0.0 1.8
Adjusted segment operating income 53.1 119.2
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Operating income 8.0 4.1
Restructuring, integration and acquisition costs 1.7 6.5
Impairment reversal of non-financial assets following their repurposing and optimization 0.0 0.0
Cloud computing transition adjustment (Note 4) 0.0 0.0
Adjusted segment operating income $ 9.7 $ 10.6