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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

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