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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of operating segments [line items]    
Total capital expenditures $ 362.8 $ 163.6
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
Total capital expenditures 300.7 116.7
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Total capital expenditures 46.5 27.5
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Total capital expenditures $ 15.6 $ 19.4