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GOVERNMENT PARTICIPATION - Narrative (Details) - CAD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2018
Disclosure of Government Grants [Line Items]        
Borrowings   $ 1,255,400,000   $ 1,260,900,000
Project Innovate        
Disclosure of Government Grants [Line Items]        
Borrowings $ 250,000,000      
Term of program 5 years 6 months      
Project New Core Markets        
Disclosure of Government Grants [Line Items]        
Term of program     4 years  
Government participation     $ 70,000,000  
Project SimÉco 4.0        
Disclosure of Government Grants [Line Items]        
Government participation, percent of eligible costs, committed contributions   50.00%