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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Operating Profit (Details) - CAD ($) $ in Millions | 12 Months Ended
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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

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