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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Disclosure of financial assets [line items]        
Accounts receivable     $ 450.5 $ 367.4
Credit loss allowances $ (27.5) $ (22.0) (27.5) (22.0)
Investment in finance leases (Note 14)     16.8 11.4
Receivables from related parties     45.8 30.9
Other receivables     53.0 86.3
Total accounts receivable     566.1 [1] 496.0
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]        
Credit loss allowances, beginning of year (22.0) (20.9)    
Changes in allowance account for credit losses of financial assets [abstract]        
Additions (7.4) (7.3)    
Amounts charged off 0.8 5.0    
Unused amounts reversed 1.8 0.7    
Foreign currency exchange differences (0.7) 0.5    
Credit loss allowances, end of year $ (27.5) $ (22.0)    
Gross carrying amount | Current        
Disclosure of financial assets [line items]        
Accounts receivable     215.1 227.3
Gross carrying amount | 1-30 days        
Disclosure of financial assets [line items]        
Accounts receivable     95.7 55.4
Gross carrying amount | 31-60 days        
Disclosure of financial assets [line items]        
Accounts receivable     27.8 19.5
Gross carrying amount | 61-90 days        
Disclosure of financial assets [line items]        
Accounts receivable     34.1 7.6
Gross carrying amount | Greater than 90 days        
Disclosure of financial assets [line items]        
Accounts receivable     $ 105.3 $ 79.6
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.