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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of operating segments [line items]    
Operating income $ 284.2 $ 48.4
Restructuring, integration and acquisition costs 146.9 124.0
Cloud computing transition adjustment (Note 5) 13.4 0.0
Civil Aviation    
Disclosure of operating segments [line items]    
Cloud computing transition adjustment (Note 5)   0.0
Operating segments    
Disclosure of operating segments [line items]    
Operating income 284.2 48.4
Restructuring, integration and acquisition costs 146.9 124.0
Cloud computing transition adjustment (Note 5) 13.4 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 0.0 108.2
Adjusted segment operating income 444.5 280.6
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
Operating income 224.1 6.5
Restructuring, integration and acquisition costs 79.0 76.1
Cloud computing transition adjustment (Note 5) 11.6  
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 0.0 81.7
Adjusted segment operating income 314.7 164.3
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Operating income 56.0 15.5
Restructuring, integration and acquisition costs 61.4 45.0
Cloud computing transition adjustment (Note 5) 1.8 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 0.0 26.5
Adjusted segment operating income 119.2 87.0
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Operating income 4.1 26.4
Restructuring, integration and acquisition costs 6.5 2.9
Cloud computing transition adjustment (Note 5) 0.0 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 0.0 0.0
Adjusted segment operating income $ 10.6 $ 29.3