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Share Capital, Option Plans and Share-Based Payments - Schedule of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used (Details) - $ / shares
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Weighted-average fair value of options granted (in dollars per share) $ 7.06 $ 5.69 $ 6.73
Expected volatility 28.32% 31.76% 31.74%
Risk–free interest rate 1.46% 1.31% 1.41%
Expected dividend yield 1.43% 1.62% 1.23%
Expected life (in years) 4 years 6 months 2 days 4 years 3 months 29 days 4 years 3 months 29 days
Forfeiture rate (based on historical rates) 5.00% 5.00% 5.00%
Average exercised share price (in dollars per share) $ 31.75 $ 24.09 $ 27.17
Derived service period (in years) 1 year 9 months 15 days   2 years 26 days