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Prepaid Expenses and Other Assets - Schedule of Prepaid Expenses and Other Assets (Details) - CAD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
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Prepaid Expenses And Other Assets [Line Items] |  |
Restricted short-term investments | $ 664 | $ 550
Other assets | 2,199 | 801
Prepaid expenses and other assets | 19,837 | 4,285
Prepaid Packaging |  |
Prepaid Expenses And Other Assets [Line Items] |  |
Prepaid expenses | 8,774 |
Prepaid Expenses |  |
Prepaid Expenses And Other Assets [Line Items] |  |
Prepaid expenses | 7,358 | $ 2,934
Prepaid Deposits |  |
Prepaid Expenses And Other Assets [Line Items] |  |
Prepaid expenses | $ 842 |

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