Stock-Based Compensation - Assumptions Used in Black-Scholes Valuation for Grants (Details) - Stock Option [Member]	12 Months Ended
	Jun. 30, 2016
Assumptions used in valuation of stock options
Risk-free interest rate	1.40%
Expected life (years)	4 years 6 months	[1]
Expected volatility	31.70%	[2]
Expected dividend yield	2.10%

[1] Expected life is derived from historical experience.

[2] Expected volatility is based on the implied historical volatility of our stock.