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INVENTORIES - Cost of Sales (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Inventory [Line Items]    
Cost of inventories recognised as expense during period $ 311.1 $ 273.3
Work In Progress    
Schedule of Inventory [Line Items]    
Cost of inventories recognised as expense during period 204.2 141.6
Raw Materials, Supplies And Manufactured Products    
Schedule of Inventory [Line Items]    
Cost of inventories recognised as expense during period $ 106.9 $ 131.7