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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2017
Disclosure of financial assets [line items]            
Accounts receivable     $ 367.4 $ 345.5    
Credit loss allowances $ (20.9) $ (14.5) (22.0) (20.9)   $ (14.5)
Accrued receivables     6.4 1.2    
Receivables from related parties     33.9 38.0    
Other receivables     88.3 67.3    
Total accounts receivable     496.0 452.0 $ 450.1 $ 450.1
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]            
Credit loss allowances, beginning of year (20.9) (14.5)        
Changes in allowance account for credit losses of financial assets [abstract]            
Additions (7.3) (13.6)        
Amounts charged off 5.0 6.7        
Unused amounts reversed 0.7 1.5        
Exchange differences 0.5 (1.0)        
Credit loss allowances, end of year $ (22.0) $ (20.9)        
Gross carrying amount | Current            
Disclosure of financial assets [line items]            
Accounts receivable     227.3 187.9    
Gross carrying amount | 1-30 days            
Disclosure of financial assets [line items]            
Accounts receivable     55.4 52.1    
Gross carrying amount | 31-60 days            
Disclosure of financial assets [line items]            
Accounts receivable     19.5 40.9    
Gross carrying amount | 61-90 days            
Disclosure of financial assets [line items]            
Accounts receivable     7.6 15.6    
Gross carrying amount | Greater than 90 days            
Disclosure of financial assets [line items]            
Accounts receivable     $ 79.6 $ 69.9