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INVENTORIES - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Inventories [Abstract] |  |
Cost of inventories recognised as expense during period | $ 523.5 | $ 303.6

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- Definition Inventories [Abstract] + References No definition available. + Details
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- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_d&doctype=Standard -URIDate 2018-03-16 + Details
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