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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of operating segments [line items]    
Payments to acquire productive assets $ 338.4 $ 221.2
Operating segments | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Payments to acquire productive assets 260.1 162.0
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Payments to acquire productive assets 65.7 49.2
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Payments to acquire productive assets $ 12.6 $ 10.0