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Significant Accounting Policies and Judgments - Adjustments to Opening Balances (Details) - CAD ($)
$ in Thousands
Jun. 30, 2020
Jul. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Disclosure of initial application of standards or interpretations [line items]        
Prepaid deposits $ 22,137 $ 24,323 $ 24,323  
Property, plant and equipment 946,380 765,567 765,567 $ 246,352
Current loans and borrowings (120,508) (13,758) (13,758)  
Non-current loans and borrowings (83,701) (127,486) (127,486)  
Deficit $ 3,592,787 283,639 $ 286,311  
IFRS 16 transition adjustments        
Disclosure of initial application of standards or interpretations [line items]        
Prepaid deposits   (585)    
Property, plant and equipment   96,049    
Current loans and borrowings   (6,630)    
Non-current loans and borrowings   (88,834)    
Deficit   0    
Inventory restatement adjustments        
Disclosure of initial application of standards or interpretations [line items]        
Prepaid deposits   0    
Property, plant and equipment   0    
Current loans and borrowings   0    
Non-current loans and borrowings   0    
Deficit   2,672    
As reported under IFRS 16        
Disclosure of initial application of standards or interpretations [line items]        
Prepaid deposits   23,738    
Property, plant and equipment   861,616    
Current loans and borrowings   (20,388)    
Non-current loans and borrowings   (216,320)    
Deficit   $ 286,311