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Share Capital - Summary of Options Outstanding (Details) - Compensation Options
 12 Months Ended
Jun. 30, 2019
$ / shares
shares
Disclosure of classes of share capital [line items]  
Compensation options, beginning balance (in shares) | shares 300
Compensation options, exercised (in shares) | shares (300)
Compensation options, ending balance (in shares) | shares 0
Weighted average exercise price, beginning balance (in CAD per share) | $ / shares $ 55.52
Weighted average exercise price, exercised (in CAD per share) | $ / shares 55.52
Weighted average exercise price, ending balance (in CAD per share) | $ / shares $ 0.00