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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 163.1 $ 147.0
Cost of sales    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 161.5 145.0
Research and development expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation 0.0 0.5
Selling, general and administrative expenses    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation $ 1.6 $ 1.5