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Acquistions and Disposals - Summary of Balance Sheet Impact on Acquisition Date (Details) - CAD ($) |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 07, 2017 | Sep. 06, 2017 | May 01, 2017 | Jan. 31, 2017 | Dec. 12, 2016 | Mar. 31, 2016
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | $ 314,923,000 | $ 241,371,000 |  |  |  |  |  | $ 20,866,000
Consideration paid in cash |  |  |  | $ 6,000,000 |  |  |  |  |
Consideration paid in cash |  |  |  | $ (6,000,000) |  |  |  |  |
Acquisition-related costs expensed | $ 43,000 | 3,406,000 | 7,369,000 |  |  |  |  |  |
Tweed Grasslands |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 59,000 |  |  |  |  |  |  |
Amounts receivable |  | 16,000 |  |  |  |  |  |  |
Prepaids and other assets |  | 6,000 |  |  |  |  |  |  |
Property, plant and equipment |  | 1,446,000 |  |  |  |  |  |  |
Goodwill |  | 29,736,000 |  |  |  |  |  |  |
Accounts payable and accrued liablities |  | (336,000) |  |  |  |  |  |  |
Net assets |  | 30,927,000 |  |  |  |  |  |  |
Net assets acquired |  | 30,927,000 |  |  |  |  |  |  |
Consideration paid in cash |  | 450,000 |  |  |  |  |  |  |
Consideration paid in shares |  | 6,381,000 |  |  |  |  |  |  |
Other consideration |  | 2,382,000 |  |  |  |  |  |  |
Contingent consideration |  | 21,714,000 |  |  |  | $ 21,714,000 |  |  |
Total consideration |  | 30,927,000 |  |  |  | $ 30,927,000 |  |  |
Consideration paid in cash |  | (450,000) |  |  |  |  |  |  |
Net cash (outflow) inflow |  | (391,000) |  |  |  |  |  |  |
Acquisition-related costs expensed |  | 302,000 |  |  |  |  |  |  |
Tweed JA |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 125,000 |  |  |  |  |  |  |
Subscription receivable |  | 3,669,000 |  |  |  |  |  |  |
Property, plant and equipment |  | 182,000 |  |  |  |  |  |  |
Goodwill |  | 1,835,000 |  |  |  |  |  |  |
Accounts payable and accrued liablities |  | (29,000) |  |  |  |  |  |  |
Net assets |  | 5,782,000 |  |  |  |  |  |  |
Non-controlling interests |  | (2,013,000) |  |  |  |  |  |  |
Net assets acquired |  | 3,769,000 |  |  |  |  |  |  |
Consideration paid in cash |  | 100,000 |  |  |  |  |  |  |
Future cash consideration |  | 3,669,000 |  |  |  |  |  |  |
Total consideration |  | 3,769,000 |  |  | $ 3,769,000 |  |  |  |
Consideration paid in cash |  | (100,000) |  |  |  |  |  |  |
Net cash (outflow) inflow |  | 25,000 |  |  |  |  |  |  |
Acquisition-related costs expensed |  | 24,000 |  |  |  |  |  |  |
Spectrum Cannabis Denmark Aps |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Inventory |  | 173,000 |  |  |  |  |  |  |
Property, plant and equipment |  | 3,990,000 |  |  |  |  |  |  |
Deferred tax liability |  | (297,000) |  |  |  |  |  |  |
Net assets |  | 3,866,000 |  |  |  |  |  |  |
Net assets acquired |  | 3,866,000 |  |  |  |  |  |  |
Consideration paid in cash |  | 3,228,000 |  |  |  |  |  |  |
Total consideration |  | 3,228,000 |  |  |  |  |  |  |
Consideration paid in cash |  | (3,228,000) |  |  |  |  |  |  |
Net cash (outflow) inflow |  | (3,228,000) |  |  |  |  |  |  |
Acquisition-related costs expensed |  | 33,000 |  |  |  |  |  |  |
Mettrum |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 12,309,000 |  |  |  | $ 12,309,000 |  |
Amounts receivable |  |  | 2,140,000 |  |  |  |  |  |
Inventory |  |  | 5,022,000 |  |  |  |  |  |
Prepaids and other assets |  |  | 1,184,000 |  |  |  |  |  |
Property, plant and equipment |  |  | 22,451,000 |  |  |  |  |  |
Goodwill |  |  | 207,081,000 |  |  |  |  |  |
Accounts payable and accrued liablities |  |  | (5,663,000) |  |  |  |  |  |
Net assets |  |  | 350,334,000 |  |  |  |  |  |
Net assets acquired |  |  | 350,334,000 |  |  |  |  |  |
Consideration paid in shares |  |  | 337,511,000 |  |  |  |  |  |
Other consideration |  |  | 12,823,000 |  |  |  |  |  |
Total consideration |  |  | 350,334,000 |  |  |  | $ 350,334,000 |  |
Net cash (outflow) inflow |  |  | 12,309,000 |  |  |  |  |  |
Acquisition-related costs expensed |  |  | 5,190,000 |  |  |  |  |  |
Biological assets |  |  | 1,691,000 |  |  |  |  |  |
Assets classified as held for sale |  |  | 7,000,000 |  |  |  |  |  |
Intangible assets |  |  | 131,009,000 |  |  |  |  |  |
Debt |  |  | (3,576,000) |  |  |  |  |  |
Other liabilities |  |  | (768,000) |  |  |  |  |  |
Deferred tax liability |  |  | (29,546,000) |  |  |  |  |  |
Vert Mirabel |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | 5,625,000 |  |  |  |  |  |  |
Net assets |  | 5,625,000 |  |  |  |  |  |  |
Non-controlling interests |  | (2,839,000) |  |  |  |  |  |  |
Net assets acquired |  | 2,786,000 |  |  |  |  |  |  |
Other consideration |  | 3,750,000 |  |  |  |  |  |  |
Total consideration |  | 3,750,000 |  |  |  |  |  |  |
Acquisition-related costs expensed |  | 54,000 |  |  |  |  |  |  |
MedCann |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Amounts receivable |  |  | 5,000 |  |  |  |  |  |
Inventory |  |  | 137,000 |  |  |  |  |  |
Prepaids and other assets |  |  | 102,000 |  |  |  |  |  |
Property, plant and equipment |  |  | 336,000 |  |  |  |  |  |
Goodwill |  |  | 9,209,000 |  |  |  |  |  |
Accounts payable and accrued liablities |  |  | (107,000) |  |  |  |  |  |
Net assets |  |  | 10,406,000 |  |  |  |  |  |
Net assets acquired |  |  | 10,406,000 |  |  |  |  |  |
Consideration paid in shares |  |  | 9,720,000 |  |  |  |  |  |
Contingent consideration |  |  | 688,000 |  |  |  |  |  |
Total consideration |  |  | 10,408,000 |  |  |  |  | $ 3,660,000 |
Acquisition-related costs expensed |  |  | 372,000 |  |  |  |  |  |
Intangible assets |  |  | 784,000 |  |  |  |  |  |
Deferred tax liability |  |  | (60,000) |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 7,000 | 15,000 |  |  |  |  |  |
Amounts receivable |  | 14,000 |  |  |  |  |  |  |
Prepaids and other assets |  | 107,000 | 24,000 |  |  |  |  |  |
Property, plant and equipment |  | 468,000 | 565,000 |  |  |  |  |  |
Goodwill |  | 1,562,000 | 4,024,000 |  |  |  |  |  |
Accounts payable and accrued liablities |  | (143,000) | (115,000) |  |  |  |  |  |
Net assets |  | 2,015,000 | 4,525,000 |  |  |  |  |  |
Non-controlling interests |  |  | (19,000) |  |  |  |  |  |
Net assets acquired |  | 2,015,000 | 4,506,000 |  |  |  |  |  |
Consideration paid in cash |  | 166,000 | 1,131,000 |  |  |  |  |  |
Consideration paid in shares |  | 1,850,000 | 2,124,000 |  |  |  |  |  |
Contingent consideration |  |  | 1,251,000 |  |  |  |  |  |
Total consideration |  | 2,016,000 | 4,506,000 |  |  |  |  |  |
Consideration paid in cash |  | (166,000) | (1,131,000) |  |  |  |  |  |
Net cash (outflow) inflow |  | (159,000) | (1,116,000) |  |  |  |  |  |
Acquisition-related costs expensed |  | $ 213,000 | 163,000 |  |  |  |  |  |
Intangible assets |  |  | $ 12,000 |  |  |  |  |  |

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