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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currencies (sold/bought)
$ in Millions
 12 Months Ended
Mar. 31, 2023
CAD ($)
Mar. 31, 2022
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2,119.4 $ 1,320.6
USD/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 864.6 $ 514.5
Average rate (in percent) 0.74 0.80
USD/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 179.1 $ 85.0
Average rate (in percent) 0.76 0.78
USD/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 12.8 $ 11.5
Average rate (in percent) 0.77 0.79
EUR/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 249.5 $ 169.9
Average rate (in percent) 0.68 0.67
EUR/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 61.8 $ 15.7
Average rate (in percent) 0.71 0.65
EUR/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1.0 $ 0.2
Average rate (in percent) 0.70 0.64
GBP/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 73.4 $ 72.0
Average rate (in percent) 0.62 0.59
GBP/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1.2 $ 2.3
Average rate (in percent) 0.61 0.58
CDN/USD | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 323.4 $ 132.1
Average rate (in percent) 1.35 1.29
CDN/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 10.7 $ 30.3
Average rate (in percent) 1.31 1.28
Other currencies | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 341.9 $ 286.8
Other currencies | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 0.0 $ 0.3