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Strategic Investments - Cann Group Limited (Details)
$ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Jun. 30, 2020
CAD ($)
shares
Jun. 30, 2019
CAD ($)
shares
Jun. 30, 2020
CAD ($)
shares
Jun. 30, 2019
CAD ($)
shares
Jun. 30, 2020
AUD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
Jun. 30, 2019
AUD ($)
$ / shares
shares
Disclosure of associates [line items]              
Share price (in A$ per share) | $ / shares           $ 12.42  
Impairment | $     $ 75,035 $ 88,932      
Cann Group              
Disclosure of associates [line items]              
Total shareholdings (in shares) | shares 31,956,347 31,956,347 31,956,347 31,956,347 31,956,347   31,956,347
Proportion of ownership interest in associate 22.40% 22.50%          
Share price (in A$ per share) | $ / shares         $ 0.79   $ 1.96
Fair value of investment in associates $ 23,400 $ 57,000 $ 23,400 $ 57,000 $ 25.0   $ 62.0
Impairment | $     $ 37,213 $ 18,158