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INVENTORIES - Cost of Sales (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Schedule of Inventory [Line Items] |  |
Cost of inventories recognised as expense during period | $ 311.1 | $ 273.3
Work In Progress |  |
Schedule of Inventory [Line Items] |  |
Cost of inventories recognised as expense during period | 204.2 | 141.6
Raw Materials, Supplies And Manufactured Products |  |
Schedule of Inventory [Line Items] |  |
Cost of inventories recognised as expense during period | $ 106.9 | $ 131.7

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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 2017-01-01 -Paragraph 36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=para_36_d&doctype=Standard -URIDate 2017-03-09 + Details
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