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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Operating Profit (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of operating segments [line items]    
Segment operating income $ 480.6 $ 462.8
Operating segments    
Disclosure of operating segments [line items]    
Segment operating income $ 480.6 $ 462.8