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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 147.0 $ 154.8
Cost of sales    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 145.0 152.4
Research and development expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 0.5 0.5
Selling, general and administrative expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 1.5 $ 1.9