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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

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