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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Restructuring, Integration and Acquisition costs [Abstract]    
Integration and acquisition costs $ 11.5 $ 79.9
Severances and other employee related costs 33.9 31.2
Impairment of non-financial assets – net 5.2 19.2
Other costs 5.9 1.1
Restructuring, integration and acquisition costs $ 56.5 $ 131.4