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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of related party transactions [Abstract]    
Salaries and other short-term employee benefits $ 7.6 $ 8.4
Post-employment benefits – defined benefit plans 4.4 2.2
Share-based payments expense 1.7 6.6
Key management personnel compensation 13.7 17.2
Compensation earned by non-employee directors $ 2.9 $ 2.4