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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of operating segments [line items]    
Payments to acquire productive assets $ 221.2 $ 274.0
Operating segments | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Payments to acquire productive assets 162.0 145.3
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Payments to acquire productive assets 49.2 122.7
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Payments to acquire productive assets $ 10.0 $ 6.0