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GOVERNMENT PARTICIPATION - Narrative (Details) - CAD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Disclosure of Government Grants [Line Items]          
Borrowings     $ 1,260,900,000   $ 2,328,300,000
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%    
Project Digital Intelligence          
Disclosure of Government Grants [Line Items]          
Term of program 5 years        
Strategic Innovation Fund | Project Digital Intelligence          
Disclosure of Government Grants [Line Items]          
Government participation $ 150,000,000.0        
Government of Quebec through IQ | Project Digital Intelligence          
Disclosure of Government Grants [Line Items]          
Government participation $ 47,500,000.0