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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Restructuring, Integration and Acquisition costs [Abstract]    
Integration and acquisition costs $ 79.9 $ 65.8
Severances and other employee related costs 31.2 2.0
Impairment of non-financial assets – net 19.2 1.8
Other costs 1.1 2.8
Impairment reversal of non-financial assets following their repurposing and optimization 0.0 (9.8)
Restructuring, integration and acquisition costs $ 131.4 $ 62.6