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Supplementary Cash Flow Information - Summary of Changes in Non-Cash Working Capital (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Cash Flow Statement [Abstract] |  |
Amounts receivable | $ (15,738) | $ (2,184)
Prepaid expenses and other assets | (15,770) | (1,493)
Biological assets and inventory | (24,493) | (12,270)
Accounts payable and accrued liabilities | 27,130 | (200)
Deferred revenue | 312 | 55
Other liabilities | 40 | (256)
Total | $ (28,519) | $ (16,348)

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