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Share Capital, Option Plans and Share-Based Payments - Summary of Information Regarding Stock Options Outstanding (Details) - $ / shares
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Options Outstanding      
Number of options Outstanding as of June 30, 2019 7,102,753 7,078,435 8,977,830
Weighted Average Remaining Contractual Life (years) 4 years 1 month 6 days 4 years 5 months 4 days  
Weighted Average Exercise Price $ 31.82 $ 28.41 $ 24.57
Options Exercisable      
Number of options Exercisable as of June 30, 2019 2,176,002 2,482,288  
Weighted Average Exercise Price $ 27.44 $ 24.50  
Stock Options Exercise Price Range One      
Range of Exercise Prices      
Minimum (in dollars per share) 13.19    
Maximum (in dollars per share) $ 24.78    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 516,429    
Weighted Average Remaining Contractual Life (years) 2 years 8 months 19 days    
Weighted Average Exercise Price $ 21.81    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 354,551    
Weighted Average Exercise Price $ 21.33    
Stock Options Exercise Price Range Two      
Range of Exercise Prices      
Minimum (in dollars per share) 24.79    
Maximum (in dollars per share) $ 26.53    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 562,200    
Weighted Average Remaining Contractual Life (years) 1 year 9 months 3 days    
Weighted Average Exercise Price $ 25.18    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 562,200    
Weighted Average Exercise Price $ 25.18    
Stock Options Exercise Price Range Three      
Range of Exercise Prices      
Minimum (in dollars per share) 26.54    
Maximum (in dollars per share) $ 27.46    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 1,230,000    
Weighted Average Remaining Contractual Life (years) 1 year 4 months 20 days    
Weighted Average Exercise Price $ 27.09    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 330,000    
Weighted Average Exercise Price $ 27.09    
Stock Options Exercise Price Range Four      
Range of Exercise Prices      
Minimum (in dollars per share) 27.47    
Maximum (in dollars per share) $ 30.06    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 768,566    
Weighted Average Remaining Contractual Life (years) 3 years 6 months 7 days    
Weighted Average Exercise Price $ 28.96    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 466,254    
Weighted Average Exercise Price $ 28.61    
Stock Options Exercise Price Range Five      
Range of Exercise Prices      
Minimum (in dollars per share) 30.07    
Maximum (in dollars per share) $ 32.75    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 680,000    
Weighted Average Remaining Contractual Life (years) 3 years 8 months 23 days    
Weighted Average Exercise Price $ 32.36    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 27,500    
Weighted Average Exercise Price $ 30.37    
Stock Options Exercise Price Range Six      
Range of Exercise Prices      
Minimum (in dollars per share) 32.76    
Maximum (in dollars per share) $ 34.48    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 760,620    
Weighted Average Remaining Contractual Life (years) 5 years 1 month 9 days    
Weighted Average Exercise Price $ 33.79    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 224,875    
Weighted Average Exercise Price $ 33.66    
Stock Options Exercise Price Range Seven      
Range of Exercise Prices      
Minimum (in dollars per share) 34.49    
Maximum (in dollars per share) $ 35.61    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 849,118    
Weighted Average Remaining Contractual Life (years) 5 years 6 months 3 days    
Weighted Average Exercise Price $ 34.61    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 204,372    
Weighted Average Exercise Price $ 34.61    
Stock Options Exercise Price Range Eight      
Range of Exercise Prices      
Minimum (in dollars per share) 35.62    
Maximum (in dollars per share) $ 38.26    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 380,000    
Weighted Average Remaining Contractual Life (years) 6 years 6 months 14 days    
Weighted Average Exercise Price $ 37.19    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 6,250    
Weighted Average Exercise Price $ 36.50    
Stock Options Exercise Price Range Nine      
Range of Exercise Prices      
Minimum (in dollars per share) 38.27    
Maximum (in dollars per share) $ 39.51    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 730,820    
Weighted Average Remaining Contractual Life (years) 6 years 1 month 6 days    
Weighted Average Exercise Price $ 39.27    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 0    
Weighted Average Exercise Price $ 0    
Stock Options Exercise Price Range Ten      
Range of Exercise Prices      
Minimum (in dollars per share) 39.52    
Maximum (in dollars per share) $ 40.20    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 625,000    
Weighted Average Remaining Contractual Life (years) 6 years 10 months 6 days    
Weighted Average Exercise Price $ 40.10    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 0    
Weighted Average Exercise Price $ 0    
Stock Options Exercise Price Range Eleven      
Range of Exercise Prices      
Minimum (in dollars per share) 13.19    
Maximum (in dollars per share) $ 40.20    
Options Outstanding      
Number of options Outstanding as of June 30, 2019 7,102,753    
Weighted Average Remaining Contractual Life (years) 4 years 1 month 6 days    
Weighted Average Exercise Price $ 31.82    
Options Exercisable      
Number of options Exercisable as of June 30, 2019 2,176,002    
Weighted Average Exercise Price $ 27.44