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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currencies (sold/bought) $ in Millions | 12 Months Ended
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Mar. 31, 2025 CAD ($) | Mar. 31, 2024 CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 2,829.3 | $ 2,916.5
USD/CDN | Less than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 1,257.8 | $ 1,280.2
Average rate (in percent) | 0.72 | 0.74
USD/CDN | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 250.8 | $ 268.9
Average rate (in percent) | 0.73 | 0.75
USD/CDN | Between 3 and 5 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 0.4 | $ 2.6
Average rate (in percent) | 0.75 | 0.75
EUR/CDN | Less than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 308.1 | $ 340.1
Average rate (in percent) | 0.66 | 0.68
EUR/CDN | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 60.7 | $ 71.0
Average rate (in percent) | 0.66 | 0.67
EUR/CDN | Between 3 and 5 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 2.4 | $ 19.4
Average rate (in percent) | 0.65 | 0.65
CDN/USD | Less than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 489.6 | $ 467.9
Average rate (in percent) | 1.42 | 1.35
CDN/USD | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 31.3 | $ 22.5
Average rate (in percent) | 1.39 | 1.34
CDN/USD | 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) | 1.37 | 0
Other currencies | Less than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 426.4 | $ 435.1
Other currencies | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Notional amount | $ 1.6 | $ 8.8

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