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RELATED PARTY TRANSACTIONS - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of transactions between related parties [line items]    
Non-current receivables $ 132.2 $ 131.8
Joint ventures    
Disclosure of transactions between related parties [line items]    
Finance lease receivables 6.7 9.3
Loans and receivables 11.1 8.9
Non-current receivables $ 0.9 7.2
Joint ventures | Fixed interest rate    
Disclosure of transactions between related parties [line items]    
Finance lease receivable, interest rate 5.14%  
Loans and receivables, interest rate 2.50%  
Other related parties    
Disclosure of transactions between related parties [line items]    
Services received, related party transactions $ 0.6 $ 0.8