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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
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 7.32 $ 5.41 $ 6.86 $ 5.53
Expected volatility 27.64% 31.53% 28.61% 32.23%
Risk–free interest rate 1.70% 1.08% 1.32% 1.34%
Expected dividend yield 1.37% 1.70% 1.42% 1.66%
Expected life (in years) 4 years 4 months 4 days 4 years 3 months 29 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% 5.00%
Average exercised share price (in dollars per share) $ 33.48 $ 23.51 $ 31.34 $ 23.07