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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of operating segments [line items]    
Total capital expenditures $ 163.6 $ 384.0
Operating segments | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Total capital expenditures 116.7 296.3
Operating segments | Defence and Security    
Disclosure of operating segments [line items]    
Total capital expenditures 27.5 74.8
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Total capital expenditures $ 19.4 $ 12.9