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Share Capital - Acquisitions - Summary of Equity Issuances Related to Acquisitions (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares | 4,515,879 | 36,138,911
Acquisition related share issuance's | $ 30,248 | $ 353,214
Acquisition related share based reserve | $ 689 | 11,675
R Trees |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares | 3,494,505 |
Acquisition related share issuance's | $ 28,026 |
Acquisition related share based reserve | $ 1,079 |
Spot |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares | 111,669 |
Acquisition related share issuance's | $ 984 |
Green Hemp |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares | 24,577 |
Acquisition related share issuance's | $ 848 |
MedCann Access |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Acquisition related share based reserve | $ (390) | $ (468)
Shares released from escrow related to the acquisition, shares | 240,678 | 1,011,239
Shares released from escrow related to the acquisition | $ 390 | $ 2,919
Hemp |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares |  | 129,021
Acquisition related share issuance's |  | $ 1,711
Shares released from escrow related to the acquisition, shares | 129,016 |
Spectrum Cannabis GmbH |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Shares released from escrow related to the acquisition, shares | 367,981 |
Vert Medical |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Shares released from escrow related to the acquisition, shares | 147,453 |
Mettrum Hempworks Inc. |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares |  | 34,265,042
Acquisition related share issuance's |  | $ 336,514
Acquisition related share based reserve |  | $ 12,143
Spektrum Cannabis GmbH |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares |  | 674,631
Acquisition related share issuance's |  | $ 10,406
Vert |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Issuance of shares for acquisition, Shares |  | 58,978
Acquisition related share issuance's |  | $ 1,664

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