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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Restructuring, Integration and Acquisition costs [Abstract]    
Integration and acquisition costs $ 66.3 $ 87.8
Impairment of non-financial assets – net 2.3 37.1
Severances and other employee related costs 2.7 6.9
Other costs 2.8 15.1
Impairment reversal of non-financial assets following their repurposing and optimization (9.8) 0.0
Restructuring, integration and acquisition costs $ 64.3 $ 146.9