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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currencies (sold/bought)
$ in Millions
 12 Months Ended
Mar. 31, 2024
CAD ($)
Mar. 31, 2023
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2,916.5 $ 2,119.4
USD/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1,280.2 $ 864.6
Average rate (in percent) 0.74 0.74
USD/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 268.9 $ 179.1
Average rate (in percent) 0.75 0.76
USD/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2.6 $ 12.8
Average rate (in percent) 0.75 0.77
EUR/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 340.1 $ 249.5
Average rate (in percent) 0.68 0.68
EUR/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 71.0 $ 61.8
Average rate (in percent) 0.67 0.71
EUR/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 19.4 $ 1.0
Average rate (in percent) 0.65 0.70
GBP/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 53.9 $ 73.4
Average rate (in percent) 0.59 0.62
GBP/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 5.4 $ 1.2
Average rate (in percent) 0.59 0.61
CDN/USD | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 467.9 $ 323.4
Average rate (in percent) 1.35 1.35
CDN/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 22.5 $ 10.7
Average rate (in percent) 1.34 1.31
Other currencies | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 381.2 $ 341.9
Other currencies | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 3.4 $ 0.0