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Property, Plant and Equipment - Narrative (Details) - CAD ($)
 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Nov. 25, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Nov. 25, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items]                    
Borrowing costs capitalized to construction in progress                 $ 22,000,000 $ 25,200,000
Weighted average interest rate for capitalization                 13.00% 14.00%
Property, plant and equipment, temporarily idle   $ 216,000,000   $ 0         $ 216,000,000 $ 0
Depreciation expense                 74,500,000 45,400,000
Depreciation expense recognized in cost of goods sold                 27,200,000 12,200,000
Impairment loss recognised in profit or loss, property, plant and equipment                 148,234,000  
Impairment loss recognised in profit or loss                 75,035,000 $ 88,932,000
Canadian Hemp Cash Generating Unit [Member]                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Recoverable amount of CGU     $ 200,000       $ 200,000      
Impairment loss recognised in profit or loss   0 $ 9,800,000 $ 0 $ 0   $ 9,800,000 $ 0    
Latin American Hemp and European Hemp CGUs                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 $ 15,900,000  
Computer software & equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 3 years  
Furniture & fixtures                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 5 years  
Aurora Sun Facility                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Property, plant and equipment, temporarily idle   212,100,000             $ 212,100,000  
Nordic Sky Facility                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Property, plant and equipment, temporarily idle   $ 3,900,000             3,900,000  
Impairment loss recognised in profit or loss, property, plant and equipment                 34,600,000  
Production Facilities                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 $ 86,500,000  
Bottom of range | Production & other equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 2 years  
Bottom of range | Building & Improvements                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 20 years  
Top of range | Production & other equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 4 years  
Top of range | Building & Improvements                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Estimated useful life                 30 years  
Exeter Property                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment $ 11,000,000         $ 1,400,000        
Proceeds from disposal                 $ 8,607,000  
Exeter Property | Building & Improvements                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Proceeds from disposal                 7,214,000  
Cost | Exeter Property                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Transfer of land and real estate to held for sale                 18,200,000  
Owned assets                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 145,818,000  
Owned assets | Canadian Hemp Cash Generating Unit [Member]                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 7,400,000  
Owned assets | Computer software & equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 108,000  
Owned assets | Production & other equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 24,216,000  
Owned assets | Furniture & fixtures                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 139,000  
Owned assets | Building & Improvements                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 82,721,000  
Right-of-use lease assets                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 2,416,000  
Right-of-use lease assets | Canadian Hemp Cash Generating Unit [Member]                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 2,400,000  
Right-of-use lease assets | Production & other equipment                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 0  
Right-of-use lease assets | Building & Improvements                    
Disclosure of detailed information about property, plant and equipment [line items]                    
Impairment loss recognised in profit or loss, property, plant and equipment                 $ 2,416,000