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Stock-Based Compensation - Assumptions Used in Black-Scholes Valuation for Grants (Details) - Stock Option [Member]
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Assumptions used in valuation of stock options      
Risk-free interest rate 1.40% 1.50% 1.30%
Expected life (years) [1] 4 years 6 months 4 years 6 months 4 years 6 months
Expected volatility [2] 31.70% 32.50% 40.30%
Expected dividend yield 2.10% 1.70% 1.70%
[1] Expected life is derived from historical experience.
[2] Expected volatility is based on the implied historical volatility of our stock.