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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 6.74 $ 7.37 $ 6.49 $ 8.55
Weighted-average assumptions used:        
Expected volatility 22.03% 25.95% 22.09% 26.05%
Risk–free interest rate 1.55% 2.97% 1.65% 2.82%
Expected dividend yield 1.64% 1.73% 1.67% 1.49%
Expected life (in years) 4 years 1 month 9 days 4 years 3 months 25 days 4 years 1 month 9 days 4 years 3 months 25 days
Forfeiture rate (based on historical rates) 7.00% 6.00% 7.00% 6.00%
Average exercised share price (in dollars per share) $ 41.13 $ 33.97 $ 39.33 $ 38.56