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LEASES - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation $ 48.7  
Short-term lease, low-value assets, and variable lease payments expenses 16.3  
Net book value of property, plant and equipment leased under operating lease to third parties 72.8 $ 91.7
Cost of sales    
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation 47.0  
Selling, general and administrative expenses    
Disclosure of finance lease and operating lease by lessee [line items]    
Depreciation $ 1.7