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Non-Controlling Interests - Net Change in Non-Controlling Interests (Details) - CAD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of subsidiaries [line items]    
Beginning balance $ 4,387,374 $ 1,552,925
Change in ownership interest 0 0
Share of loss for the period (3,310,337) (300,596)
Ending balance 2,126,450 4,387,374
Non-Controlling Interests    
Disclosure of subsidiaries [line items]    
Beginning balance 4,410 4,562
Change in ownership interest (2,100) 1,081
Share of loss for the period (26,666)  
Ending balance $ (24,356) $ 4,410