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Share-Based Compensation (Weighted Average Assumptions for Options Granted) (Details) - $ / shares
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation [Abstract]      
Expected term (years) 5 years 4 years 8 days 4 years 8 days
Expected volatility 30.88% 28.70% 30.06%
Risk-free interest rate 1.84% 1.47% 1.22%
Dividend yield 0.00% 0.00% 0.00%
Weighted-average fair value per option (in dollars per share) $ 11.26 $ 9.53 $ 10.51