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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, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 8.14 $ 7.32 $ 7.48 $ 6.86
Weighted-average assumptions used:        
Expected volatility 26.95% 27.64% 27.10% 28.61%
Risk–free interest rate 2.44% 1.70% 1.83% 1.32%
Expected dividend yield 1.45% 1.37% 1.45% 1.42%
Expected life (in years) 4 years 3 months 30 days 4 years 4 months 2 days 4 years 5 months 1 day 4 years 3 months 29 days
Forfeiture rate (based on historical rates) 6.00% 5.00% 6.00% 5.00%
Average exercised share price (in dollars per share) $ 36.50 $ 33.48 $ 34.55 $ 31.34