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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Weighted-average fair value of options granted (in dollars per share) $ 8.39 $ 7.58 $ 7.06
Weighted-average assumptions used:      
Expected volatility 25.72% 26.95% 28.32%
Risk–free interest rate 2.57% 2.18% 1.46%
Expected dividend yield 1.54% 1.50% 1.43%
Expected life (in years) 4 years 5 months 8 days 4 years 4 months 17 days 4 years 6 months 3 days
Forfeiture rate (based on historical rates) 6.00% 6.00% 5.00%
Average exercised share price (in dollars per share) $ 38.81 $ 34.60 $ 31.75
Derived service period (in years)     1 year 9 months 14 days