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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - CAD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2017
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Subclassifications of assets, liabilities and equities [abstract] |  |  |  |
Accounts payable trade | $ 458.9 | $ 306.0 |  |
Accrued liabilities | 400.2 | 343.7 |  |
Amount due to related parties | 2.2 | 7.3 |  |
Current portion of royalty obligations | 10.9 | 9.9 |  |
Accounts payable and accrued liabilities | $ 872.2 | $ 666.9 | $ 686.1 | $ 686.1

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