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GOVERNMENT PARTICIPATION - Aggregate Contributions Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
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