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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currencies (sold/bought)
$ in Millions
 12 Months Ended
Mar. 31, 2025
CAD ($)
Mar. 31, 2024
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2,829.3 $ 2,916.5
USD/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1,257.8 $ 1,280.2
Average rate (in percent) 0.72 0.74
USD/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 250.8 $ 268.9
Average rate (in percent) 0.73 0.75
USD/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 0.4 $ 2.6
Average rate (in percent) 0.75 0.75
EUR/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 308.1 $ 340.1
Average rate (in percent) 0.66 0.68
EUR/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 60.7 $ 71.0
Average rate (in percent) 0.66 0.67
EUR/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2.4 $ 19.4
Average rate (in percent) 0.65 0.65
CDN/USD | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 489.6 $ 467.9
Average rate (in percent) 1.42 1.35
CDN/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 31.3 $ 22.5
Average rate (in percent) 1.39 1.34
CDN/USD | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 0.2 $ 0.0
Average rate (in percent) 1.37 0
Other currencies | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 426.4 $ 435.1
Other currencies | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1.6 $ 8.8