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Other Financial Assets - Summary of Changes in Other Financial Assets (Parenthetical) (Details) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 shares | Nov. 27, 2017 CAD ($) | Sep. 29, 2017 CAD ($) | Mar. 31, 2018 CAD ($) shares | Mar. 31, 2018 CAD ($) Warrant shares | Mar. 31, 2017 CAD ($) | Mar. 31, 2018 AUD ($) shares
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Exercise price of share options exercisable |  |  |  | $ 4.55 | $ 4.55 |  |
Percentage of voting equity interests acquired |  |  |  | 0.00% | 0.00% |  | 0.00%
Proceeds from exercise of stock options |  |  |  |  | $ 11,053,000 | $ 6,961,000 |
AusCann Group Holdings Ltd. |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Number of ordinary shares held | shares | 29,865,000 |  |  |  |  |  |
Percentage of issued and outstanding ordinary shares | 11.00% |  |  |  |  |  |
Number of options held | shares | 7,677,639 |  |  |  |  |  |
Number of ordinary shares placed in escrow | shares |  |  |  |  | 27,465,000 |  |
Exercise price of share options exercisable |  |  |  |  |  |  | $ 0.20
AusCann Group Holdings Ltd. | Shares |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Gain on fair value changes on available for sale financial assets |  |  |  |  |  | 15,900,000 |
Gain on fair value changes on available for sale financial assets, Taxes |  |  |  |  |  | 2,428,000 |
AusCann Group Holdings Ltd. | Options |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Gain on fair value changes on available for sale financial assets |  |  |  |  |  | $ 5,702,000 |
James E. Wagner Cultivation Ltd. | Canopy Rivers Corporation |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Number of common shares acquired from affiliate | shares |  |  |  |  | 37,000 |  |
Number of warrants acquired from affiliate | Warrant |  |  |  |  | 5,000 |  |
Payments for purchase of ordinary shares and warrants from affiliate |  |  |  |  | $ 3,975,000 |  |
Cash advanced to joint venture |  |  |  |  | $ 2,500,000 |  |
Interest rate |  |  |  | 8.00% | 8.00% |  | 8.00%
Royalty receivable term |  |  |  |  | 20 years |  |
Percentage of voting equity interests acquired |  |  |  | 14.70% | 14.70% |  | 14.70%
Carrying value of ordinary shares |  |  |  |  | $ 3,863,000 |  |
Carrying value of warrants |  |  |  |  | 112,000 |  |
Fair value of ordinary shares |  |  |  |  | 10,591,000 |  |
Fair value of warrants |  |  |  |  | $ 814,000 |  |
Vapium Incorporated |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 12.24% | 9.93% |  |  |  |
Ownership interest for cash investment |  |  | $ 960,000 |  |  |  |
Proceeds from exercise of stock options |  | $ 250,000 |  |  |  |  |
HydRx Farms Ltd. |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |
Number of ordinary shares held | shares |  |  |  | 3,100,307 | 3,100,307 |  | 3,100,307
Percentage of voting equity interests acquired |  |  |  | 8.70% | 8.70% |  | 8.70%
Fair value of warrants |  |  |  | $ 5,210,000 |  |  |
Fair value of common shares |  |  |  | $ 12,401,000 | $ 12,401,000 |  |
Number of warrants held | shares |  |  |  | 1,860,680 | 1,860,680 |  | 1,860,680

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