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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of related party transactions [Abstract]    
Salaries, termination and other short-term employee benefits $ 8.7 $ 7.6
Post-employment benefits – defined benefit plans 3.8 4.4
Share-based payments expense 4.4 1.7
Key management personnel compensation 16.9 13.7
Compensation earned by non-employee directors $ 3.3 $ 2.9