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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 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 7.37 $ 7.49 $ 8.55 $ 7.46
Weighted-average assumptions used:        
Expected volatility 25.95% 26.64% 26.05% 27.11%
Risk–free interest rate 2.97% 1.95% 2.82% 1.81%
Expected dividend yield 1.73% 1.48% 1.49% 1.45%
Expected life (in years) 4 years 3 months 25 days 4 years 6 months 29 days 4 years 3 months 25 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) $ 33.97 $ 34.48 $ 38.56 $ 34.49