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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currency risk $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 CAD ($) | Mar. 31, 2017 CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 1,351.4 | $ 1,380.3
USD/CDN | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 572.2 | $ 567.7
Average foreign exchange rate | 0.79 | 0.74
USD/CDN | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 131.6 | $ 158.5
Average foreign exchange rate | 0.78 | 0.77
USD/CDN | Between 3 and 5 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 20.2 | $ 8.6
Average foreign exchange rate | 0.80 | 0.77
CDN/EUR | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 40.1 | $ 33.3
Average foreign exchange rate | 1.57 | 1.45
CDN/EUR | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 0.0 | $ 15.2
Average foreign exchange rate | 0.00 | 1.45
EUR/CDN | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 125.6 | $ 79.7
Average foreign exchange rate | 0.65 | 0.69
EUR/CDN | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 2.5 | $ 4.9
Average foreign exchange rate | 0.63 | 0.67
EUR/CDN | Between 3 and 5 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 0.2 | $ 0.0
Average foreign exchange rate | 0.59 | 0.00
GBP/CDN | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 72.4 | $ 116.3
Average foreign exchange rate | 0.56 | 0.58
GBP/CDN | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 19.4 | $ 9.9
Average foreign exchange rate | 0.57 | 0.55
GBP/CDN | Between 3 and 5 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 0.0 | $ 0.1
Average foreign exchange rate | 0.00 | 0.51
CDN/GBP | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 33.4 | $ 25.7
Average foreign exchange rate | 1.80 | 1.73
CDN/GBP | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 0.0 | $ 3.1
Average foreign exchange rate | 0.00 | 1.74
CDN/USD | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 132.3 | $ 130.0
Average foreign exchange rate | 1.28 | 1.32
CDN/USD | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 5.8 | $ 8.7
Average foreign exchange rate | 1.29 | 1.33
GBP/USD | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 31.0 | $ 76.8
Average foreign exchange rate | 0.71 | 0.76
GBP/USD | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 12.8 | $ 11.1
Average foreign exchange rate | 0.76 | 0.69
Other Currencies | No later than 1 year |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 139.6 | $ 111.1
Average foreign exchange rate | 0.00 | 0.00
Other Currencies | Between 1 and 3 years |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 12.3 | $ 19.6
Average foreign exchange rate | 0.00 | 0.00

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