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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Disclosure of financial assets [line items]        
Accounts receivable     $ 345.5 $ 333.7
Allowance for doubtful accounts $ (14.5) $ (15.7) (20.9) (14.5)
Accrued receivables     116.1 105.8
Receivables from related parties (Note 32)     39.5 54.0
Other receivables     67.3 54.9
Total accounts receivable     568.4 548.4
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]        
Allowance for doubtful accounts, beginning of year (14.5) (15.7)    
Changes in allowance account for credit losses of financial assets [abstract]        
Additions (13.6) (6.1)    
Amounts charged off 6.7 5.4    
Unused amounts reversed 1.5 1.4    
Exchange differences (1.0) 0.5    
Allowance for doubtful accounts, end of year $ (20.9) $ (14.5)    
Gross carrying amount | Current        
Disclosure of financial assets [line items]        
Accounts receivable     187.9 207.5
Gross carrying amount | 1-30 days        
Disclosure of financial assets [line items]        
Accounts receivable     52.1 56.8
Gross carrying amount | 31-60 days        
Disclosure of financial assets [line items]        
Accounts receivable     40.9 14.5
Gross carrying amount | 61-90 days        
Disclosure of financial assets [line items]        
Accounts receivable     15.6 13.0
Gross carrying amount | Greater than 90 days        
Disclosure of financial assets [line items]        
Accounts receivable     $ 69.9 $ 56.4