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LEASES - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation $ 65.3 $ 53.5
Short-term lease, low-value assets, and variable lease payments expenses 21.0 16.4
Net book value of property, plant and equipment leased under operating lease to third parties 115.9 130.4
Discontinued operations    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation 0.0 0.6
Cost of sales    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation 64.0 51.4
Selling, general and administrative expense    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation $ 1.3 $ 1.5