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Strategic Investments - EnWave Corporation (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 29, 2020
CAD ($)
$ / shares
shares
Apr. 25, 2019
CAD ($)
day
$ / shares
shares
Jun. 30, 2020
CAD ($)
Jun. 30, 2019
CAD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]          
Share price (in CAD per share) | $ / shares         $ 12.42
Marketable securities designated at FVTOCI          
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]          
Unrealized loss on changes in fair value     $ 43,613 $ 78,837  
EnWave | Marketable securities designated at FVTOCI          
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]          
Number of common shares acquired (in shares) | shares   5,302,227      
Proportion of ownership interest in investment   4.90%      
Number of shares exchanged for purchase of common shares (in shares) | shares   840,576      
Shares exchanged for purchase of common shares, at fair value   $ 10,000      
Shares exchanged for purchase of common shares, at fair value, volume weighted average trading price, period | day   5      
Number of shares sold (in shares) | shares 5,302,227        
Share price (in CAD per share) | $ / shares $ 0.80        
Proceeds from sale of common shares $ 4,100        
Quoted stock price (in CAD per share) | $ / shares   $ 1.89      
Loss on sale of shares   $ 5,900      
Unrealized loss on changes in fair value   $ 8,500      
Total shareholdings (in shares) | shares       5,302,227 0
Financial assets, at fair value       $ 12,600  
Share price (in CAD per share) | $ / shares       $ 2.38  
Gain recognised in profit or loss attributable to change in unrealised gains or losses for assets held at end of period, fair value measurement       $ 2,600