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Property Plant and Equipment - Additional Information (Details) - CAD ($)
 3 Months Ended 10 Months Ended 12 Months Ended
Dec. 28, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items]            
Capitalized salaries and benefits         $ 0 $ 600,000
Construction in progress           600,000
Interest associated with construction in progress         0 1,300,000
Depreciation, capitalized to biological assets and inventory         6,900,000 5,700,000
Asset impairment       $ 523,000 $ 79,191,000 $ 162,000
Alberta CGU            
Disclosure Of Property Plant And Equipment [Line Items]            
Impairment discount rate         25.00%  
Estimated cash flow term         5 years  
Asset impairment   $ 60,000,000      
Increase impairment discount rate         1.00%  
Increase of Impairment on Assets         $ 9,200,000  
Rocky View Facility | Non-Binding Purchase Agreement            
Disclosure Of Property Plant And Equipment [Line Items]            
Fair value less costs of disposal and impairment $ 5,000,000          
Write down assets to recoverable amount 700,000          
Recoverable amount reduced due to receiving utility deposits $ 5,000,000          
Kamloops Property | Merritt Facility            
Disclosure Of Property Plant And Equipment [Line Items]            
Investment of land and construction in progress in Merritt facility         10,000,000  
Kamloops Property | Merritt Facility | B.C. Cash Generating Unit            
Disclosure Of Property Plant And Equipment [Line Items]            
Fair value less costs of disposal and impairment         5,700,000  
Write down assets to recoverable amount         4,200,000  
Recoverable amount reduced due to receiving utility deposits         2,900,000  
Other Disposals of Assets | Cannabis            
Disclosure Of Property Plant And Equipment [Line Items]            
Proceeds from sales of non-core assets         $ 2,100,000  
Sale of property closing date         Mar. 27, 2020