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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 145.6 $ 137.6
Cost of sales    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 142.8 134.9
Research and development expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 0.8 0.7
Selling, general and administrative expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 2.0 $ 2.0