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INVENTORIES - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Inventories [Line Items]    
Cost of inventories recognised as expense during period $ 557.2 $ 485.1
Impairment of inventories to net realizable value 2.1 2.5
Inventories 595.0 573.6
Discontinued operations    
Schedule of Inventories [Line Items]    
Inventories $ 0.0 $ 55.8