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Share Capital - Acquisitions - Summary of Equity Issuances Related to Acquisitions (Details) (Parenthetical) (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Share issue costs | $ 2,448 | $ 2,448
R Trees |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Share issue costs | 69 |
Spot |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Share issue costs | 9 |
Green Hemp |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Share issue costs | $ 9 |
Mettrum Hempworks Inc. |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Share issue costs |  | $ 997

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