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INVENTORIES - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule of Inventories [Line Items]    
Cost of inventories recognised as expense during period $ 485.1 $ 400.2
Impairment of inventories to net realizable value 2.5 6.2
Inventories 573.6 583.4
Discontinued operations    
Schedule of Inventories [Line Items]    
Inventories $ 55.8 $ 93.2