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Formation of Canopy Rivers - Additional Information (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 08, 2018 CAD ($) shares | May 12, 2017 CAD ($) shares | Mar. 31, 2018 CAD ($) shares $ / shares | Mar. 31, 2017 CAD ($) | Sep. 07, 2017 shares | Dec. 12, 2016 shares
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Number of shares provided in exchange for service | shares |  | 668 |  |  |  |
Equity financing issue costs net of tax |  | $ 1,709,000 |  |  |  |
Net assets acquired recorded as equity attributable to the parent |  |  | $ 1,158,773,000 | $ 639,758,000 |  |
common shares issued | shares |  |  |  |  | 111,366 | 490,641
Transaction costs |  |  | 10,008,000 | $ 8,066,000 |  |
Increase (decrease) in equity | $ 1,047,000 |  |  |  |  |
Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Advanced convertible debenture for formation of subsidiary |  | $ 20,000,000 |  |  |  |
Proportion of ownership interest in subsidiary | 31.50% | 34.10% |  |  |  |
Voting rights, percentage | 89.10% | 91.20% |  |  |  |
Net assets acquired recorded as equity attributable to the parent |  | $ 1,065,000 | $ (35,550,000) |  |  |
Percentage of option granted to acquire subsidiary |  |  | 8.70% |  |  |
Description of vesting term of option granted |  |  | vest in 3 equal tranches over 3 years |  |  |
Share-based compensation expense |  |  | $ 3,090,000 |  |  |
Description of options exercisable term |  |  | exercisable in increments, with one third being exercisable on each of the first, second and third anniversaries from the date of grant. |  |  |
Description of expiry date of option |  |  | December 4, 2022 to March 26, 2023 |  |  |
Share-based compensation expense with non-employees |  |  | $ 489,000 |  |  |
Investments by Canopy Growth | $ 5,141,000 |  |  |  |  |
Class B Common Shares | Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Seed capital advanced |  | $ 953,000 |  |  |  |
Number of shares to be purchased with seed capital advanced | shares |  | 19,066,667 |  |  |  |
Proceeds from issuing shares | $ 26,000,000 | $ 36,899,000 |  |  |  |
Options granted, per share | $ / shares |  |  | $ 0.05 |  |  |
Exercise price, share options granted |  |  | $ 0.60 |  |  |
common shares issued | shares | 23,636,365 |  |  |  |  |
Transaction costs | $ 738,000 |  |  |  |  |
Class B Common Shares | Employees And Other Individual | Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Seed capital advanced by employees |  | 503,000 |  |  |  |
Class B Common Shares | Employees | Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Number of option granted | shares |  |  | 3,475,000 |  |  |
Class B Common Shares | Consultants | Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Number of option granted | shares |  |  | 2,440,000 |  |  |
Class A Common Shares | Canopy Rivers Corporation |  |  |  |  |  |
Disclosure Of Significant Investments In Subsidiaries [Line Items] |  |  |  |  |  |
Debenture interest converted to shares |  | $ 57,000 |  |  |  |

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