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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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 6.58 $ 5.38 $ 6.54 $ 5.60
Expected volatility 28.53% 31.99% 29.29% 32.58%
Risk–free interest rate 1.22% 1.35% 1.06% 1.47%
Expected dividend yield 1.43% 1.70% 1.45% 1.64%
Expected life (in years) 4 years 4 months 4 days 4 years 3 months 29 days 4 years 3 months 29 days 4 years 3 months 29 days
Forfeiture rate (based on historical rates) 5.00% 5.00% 5.00% 5.00%
Average exercised share price (in dollars per share) $ 30.37 $ 22.68 $ 29.83 $ 22.85