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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 7.64 $ 8.14 $ 8.28 $ 7.48
Weighted-average assumptions used:        
Expected volatility 25.60% 26.95% 25.92% 27.10%
Risk–free interest rate 2.51% 2.44% 2.73% 1.83%
Expected dividend yield 1.63% 1.45% 1.53% 1.45%
Expected life (in years) 4 years 1 month 9 days 4 years 3 months 29 days 4 years 3 months 3 days 4 years 5 months 1 day
Forfeiture rate (based on historical rates) 6.00% 6.00% 6.00% 6.00%
Average exercised share price (in dollars per share) $ 37.24 $ 36.50 $ 38.16 $ 34.55