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Financial Instruments - Summary of Aging of Receivables (Details) - CAD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
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Disclosure Of Aging Of Receivables [Line Items] |  |
Receivables | $ 5,941 | $ 3,046
0-60 Days |  |
Disclosure Of Aging Of Receivables [Line Items] |  |
Receivables | 5,683 | 2,137
61-120 Days |  |
Disclosure Of Aging Of Receivables [Line Items] |  |
Receivables | $ 258 | $ 909

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