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EMPLOYEE COMPENSATION (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Employee Benefits [Abstract]    
Salaries and other short-term employee benefits $ 1,564.5 $ 1,326.2
Share-based payments expense, net of equity swap (Note 23) 32.9 39.7
Post-employment benefits – defined benefit plans (Note 19) 38.5 40.7
Post-employment benefits – defined contribution plans 25.4 17.9
Termination benefits 2.7 6.9
Total employee compensation expense $ 1,664.0 $ 1,431.4