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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

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