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GOVERNMENT PARTICIPATION - Aggregate Contributions Recognized (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure of Government Grants [Line Items] |  |
Total contributions | $ 45.2 | $ 29.0
Project New Core Markets |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 1.8 | 1.9
Contributions credited to income | 2.6 | 2.2
Total contributions | 4.4 | 4.1
Project Innovate |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 0.4 | 2.8
Contributions credited to income | 6.9 | 16.8
Total contributions | 7.3 | 19.6
Project SimÉco 4.0 |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 2.5 | 1.8
Contributions credited to income | 3.3 | 3.5
Total contributions | 5.8 | 5.3
Project Digital Intelligence |  |
Disclosure of Government Grants [Line Items] |  |
Contributions credited to capitalized expenditures | 12.1 | 0.0
Contributions credited to income | 15.6 | 0.0
Total contributions | $ 27.7 | $ 0.0

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