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GOVERNMENT PARTICIPATION - Aggregate Contributions Recognized (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure of Government Grants [Line Items] |  |
Total contributions | $ 29.0 | $ 33.3
Project New Core Markets |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 1.9 | 2.3
Contributions credited to income | 2.2 | 2.4
Total contributions | 4.1 | 4.7
Project Innovate |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 2.8 | 4.1
Contributions credited to income | 16.8 | 23.2
Total contributions | 19.6 | 27.3
Project SimÉco 4.0 |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 1.8 | 1.1
Contributions credited to income | 3.5 | 0.2
Total contributions | $ 5.3 | $ 1.3

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