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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring, Integration and Acquisition costs [Abstract]    
Integration and acquisition costs $ 6.9 $ 6.1
Impairment of non-financial assets 59.5 7.0
Severances and other employee related costs 42.9 2.7
Other costs 14.7 0.0
Total restructuring, integration and acquisition costs $ 124.0 $ 15.8