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FINANCIAL RISK MANAGEMENT - Net Income and Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Strengthening in the relevant foreign currency against the Canadian dollar (in percent) 5.00%  
Net income (loss) $ 415.0 $ (296.3)
Other comprehensive income from continuing operations 191.8 (1.4)
USD | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) 2.1 0.6
Other comprehensive income from continuing operations (10.5) (15.7)
EUR | Currencies (sold/bought)    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Net income (loss) 0.6 (1.3)
Other comprehensive income from continuing operations $ (1.1) $ (1.9)