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COMPENSATION OF KEY MANAGEMENT PERSONNEL - Compensation Of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Related party transactions [abstract]    
Salaries and other short-term employee benefits $ 12.5 $ 6.6
Post-employment benefits – defined benefit plans 2.0 3.8
Costs related to the CEO's terms of departure 6.3 0.0
Termination benefits 5.0 2.1
Share-based payments expense 22.2 4.4
Key management personnel compensation $ 48.0 $ 16.9