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Income Taxes - Summary of Effect of Temporary Differences and Loss Carryforwards (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | $ (35,924) |
Deferred tax liabilities associated with asset held for sale | 820 |
Deferred tax liability, Ending balance | (33,536) | $ (35,924)
Temporary Differences Between Assets and Liabilities |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Net deferred taxes, Beginning balance | (35,924) | (7,413)
Net deferred taxes, Recognized in profit or loss | (1,593) | 2,703
Net deferred taxes, Recognized in equity | 4,511 |
Net deferred taxes, Recognized in goodwill |  | (29,606)
Net deferred taxes, Recognized in other comprehensive income | (5,124) | (2,428)
Net deferred taxes, Disposal of consolidated entity | 5,699 |
Net deferred taxes, Business combinations and assets held for sale | (1,105) |
Net deferred taxes, Liabilities associated with asset held for sale |  | 820
Net deferred taxes, Ending balance | (33,536) | (35,924)
Temporary Differences Between Assets and Liabilities | Other |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax asset, Beginning balance | 829 | 224
Deferred tax asset, Recognized in profit or loss |  | (62)
Deferred tax asset, Recognized in equity | 4,511 |
Deferred tax asset, Recognized in goodwill |  | 667
Deferred tax asset, Ending balance | 5,340 | 829
Deferred tax liability, Beginning balance | 381 | (3)
Deferred tax liability, Recognized in profit or loss | (922) | 107
Deferred tax liability, Recognized in goodwill |  | 277
Deferred tax liability, Disposal of consolidated entity | (284) |
Deferred tax liability, Business combinations and assets held for sale | 12 |
Deferred tax liability, Ending balance | (813) | 381
Temporary Differences Between Assets and Liabilities | Loss Carryforwards |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax asset, Beginning balance | 30,494 | 9,100
Deferred tax asset, Recognized in profit or loss | 5,677 | 15,332
Deferred tax asset, Recognized in goodwill |  | 6,062
Deferred tax asset, Disposal of consolidated entity | (1,014) |
Deferred tax asset, Ending balance | 35,157 | 30,494
Temporary Differences Between Assets and Liabilities | Deferred Tax Asset |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax asset, Beginning balance | 31,323 | 9,324
Deferred tax asset, Recognized in profit or loss | 5,677 | 15,270
Deferred tax asset, Recognized in equity | 4,511 |
Deferred tax asset, Recognized in goodwill |  | 6,729
Deferred tax asset, Disposal of consolidated entity | (1,014) |
Deferred tax asset, Ending balance | 40,497 | 31,323
Temporary Differences Between Assets and Liabilities | Intangibles |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | (42,703) | (8,436)
Deferred tax liability, Recognized in profit or loss | 10,310 | 479
Deferred tax liability, Recognized in goodwill |  | (34,746)
Deferred tax liability, Disposal of consolidated entity | 6,965 |
Deferred tax liability, Ending balance | (25,428) | (42,703)
Temporary Differences Between Assets and Liabilities | Fixed Assets |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | (1,126) | (1,097)
Deferred tax liability, Recognized in profit or loss | 3,577 | 132
Deferred tax liability, Recognized in goodwill |  | (161)
Deferred tax liability, Disposal of consolidated entity | (263) |
Deferred tax liability, Business combinations and assets held for sale | (1,117) |
Deferred tax liability, Ending balance | 1,071 | (1,126)
Temporary Differences Between Assets and Liabilities | Other Long-term Liabilities |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Recognized in profit or loss | 2,783 |
Deferred tax liability, Ending balance | 2,783 |
Temporary Differences Between Assets and Liabilities | Biological Assets |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | (20,615) | (7,201)
Deferred tax liability, Recognized in profit or loss | (9,460) | (12,529)
Deferred tax liability, Recognized in goodwill |  | (885)
Deferred tax liability, Disposal of consolidated entity | 295 |
Deferred tax liability, Ending balance | (29,780) | (20,615)
Temporary Differences Between Assets and Liabilities | Investments |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | (3,184) |
Deferred tax liability, Recognized in profit or loss | (13,558) | (756)
Deferred tax liability, Recognized in other comprehensive income | (5,124) | (2,428)
Deferred tax liability, Ending balance | (21,866) | (3,184)
Temporary Differences Between Assets and Liabilities | Deferred Tax Liability |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Beginning balance | (67,247) | (16,737)
Deferred tax liability, Recognized in profit or loss | (7,270) | (12,567)
Deferred tax liability, Recognized in goodwill |  | (36,335)
Deferred tax liability, Recognized in other comprehensive income | (5,124) | (2,428)
Deferred tax liability, Disposal of consolidated entity | 6,713 |
Deferred tax liability, Business combinations and assets held for sale | (1,105) |
Deferred tax liabilities associated with asset held for sale |  | 820
Deferred tax liability, Ending balance | $ (74,033) | (67,247)
Temporary Differences Between Assets and Liabilities | Asset Held for Sale |  |
Deferred Tax Assets And Liabilities [Line Items] |  |
Deferred tax liability, Recognized in goodwill |  | (820)
Deferred tax liabilities associated with asset held for sale |  | $ 820

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