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Property, Plant and Equipment - Additional Information (Details) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 CAD ($) shares | Sep. 07, 2017 CAD ($) shares | Jan. 13, 2017 CAD ($) ft² shares | Mar. 31, 2018 CAD ($) shares | Mar. 31, 2017 CAD ($) shares | Dec. 12, 2016 shares | Mar. 31, 2016 shares
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Cash paid |  | $ 6,000 |  |  |  |  |
Number of common shares issued | shares |  | 111,366 |  |  |  | 490,641 |
Gross proceeds from common shares | $ 3,239 | $ 1,003 |  |  |  |  |
Purchase price paid through issuance of common shares |  | 2,000 |  |  |  |  |
Present value of obligation |  | 1,862 |  |  |  |  |
Acquisition costs capitalized |  | 71 |  |  |  |  |
Number of common shares issued | shares | 117,253 |  |  | 199,320,981 | 162,187,262 |  | 98,818,213
Cost |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | $ 218,322 | $ 33,147 |  |
Property, plant and equipment, Property, plant and equipment, cost disposals/adjustments |  |  |  | (1,625) | (1,346) |  |
Transfers to intangibles |  |  |  |  | 632 |  |
Niagara-on-the-Lake Greenhouse |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Total consideration transferred |  | $ 8,865 |  |  |  |  |
Hershey |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  | $ 7,163 |  |  |  |
Gross proceeds from common shares |  |  | $ 858 |  |  |  |
Number of square foot acquired | ft² |  |  | 472,000 |  |  |  |
Acquisition-related transaction costs |  |  | $ 179 |  |  |  |
Number of common shares issued | shares |  |  | 94,397 |  |  |  |
Rent deposit |  |  | $ 450 |  |  |  |
Assets in Process |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 201,509 | 18,771 |  |
Assets in Process | Cost |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 201,509 | 18,771 |  |
Property, plant and equipment, Property, plant and equipment, cost disposals/adjustments |  |  |  | (48,977) | (5,010) |  |
Expansion Or Growing Operations |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  |  | 15,997 |  |
Expansion Or Growing Operations | BC Tweed |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 71,155 |  |  |
Expansion Or Growing Operations | Tweed Inc. |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 64,813 |  |  |
Expansion Or Growing Operations | Tweed Farms Inc. |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 43,847 |  |  |
Ongoing Projects |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 21,694 |  |  |
Leasehold Improvements | Cost |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Additions |  |  |  | 338 | 2,972 |  |
Property, plant and equipment, Property, plant and equipment, cost disposals/adjustments |  |  |  | $ 4,989 | $ (23,666) |  |

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