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Share Capital, Option Plans and Share-Based Payments - Schedule of Outstanding Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Options    
Outstanding at beginning of period (in shares) 8,977,830 8,354,816
Granted (in shares) 1,322,340 2,278,974
Exercised (in shares) (2,869,569) (1,012,644)
Forfeited or expired (in shares) (352,166) (643,316)
Outstanding at end of period (in shares) 7,078,435 8,977,830
Exercisable ending balance (in shares) 2,482,288 3,736,180
Weighted- Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 24.57 $ 21.94
Granted (in dollars per share) 34.60 31.75
Exercised (in dollars per share) 18.94 20.47
Forfeited or expired (in dollars per share) 30.81 22.30
Outstanding at end of period (in dollars per share) 28.41 24.57
Exercisable at end of period (in dollars per share) $ 24.50 $ 19.27
Weighted- Average Remaining Contractual Term (years)    
Outstanding (in years) 4 years 5 months 5 days 4 years 3 months 7 days
Exercisable (in years) 3 years 1 month 17 days 2 years 8 months 27 days
Aggregate Intrinsic Value ($’000s)    
Outstanding $ 48,405 $ 64,707
Exercisable $ 26,539 $ 45,830