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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currencies (sold/bought)
$ in Millions
 12 Months Ended
Mar. 31, 2022
CAD ($)
Mar. 31, 2021
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 1,320.6 $ 2,449.6
USD/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 514.5 $ 530.9
Average rate (in percent) 0.80 0.77
USD/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 85.0 $ 127.4
Average rate (in percent) 0.78 0.77
USD/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 11.5 $ 20.5
Average rate (in percent) 0.79 0.78
EUR/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 169.9 $ 88.4
Average rate (in percent) 0.67 1.54
EUR/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 15.7 $ 95.2
Average rate (in percent) 0.65 1.57
EUR/CDN | 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) 0.64  
GBP/CDN | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 72.0 $ 52.7
Average rate (in percent) 0.59 0.57
GBP/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 2.3 $ 11.5
Average rate (in percent) 0.58 0.58
CDN/USD | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 132.1 $ 1,224.7
Average rate (in percent) 1.29 1.27
CDN/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 30.3 $ 31.0
Average rate (in percent) 1.28 1.37
Other currencies | Less than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 286.8 $ 260.8
Other currencies | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount 0.3 1.5
Other currencies | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional amount $ 0.0 $ 5.0