Common Stock and Share-based Compensation Plans (ESPP) (Details) - ESPP [Member] - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period frequency	quarterly
Purchase price, as a percent of fair market value of stock on either first or last trading day of offering period	85.00%
Number of shares authorized	1,500,000.0
Shares Available	244,000
Offering period	3 months
Expected stock price volatility		36.00%	37.00%
Shares issued under plan
Shares issued		45,000	72,000
Average fair value		$ 6.77	$ 7.52
Average purchase price		35.94	39.95
Average market price		$ 42.91	$ 50.83