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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of related party transactions [Abstract]    
Salaries and other short-term employee benefits $ 8.4 $ 6.5
Post-employment benefits – defined benefit plans 2.2 1.6
Share-based payments expense 6.6 24.8
Key management personnel compensation 17.2 32.9
Compensation earned by non-employee directors $ 2.4 $ 1.9