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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Operating Profit (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of operating segments [line items]    
Segment operating income (loss) $ 537.1 [1] $ 480.6
Operating segments    
Disclosure of operating segments [line items]    
Segment operating income (loss) $ 537.1 $ 480.6
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.