Stock Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock
Remaining number of shares authorized to be repurchased (in shares)	4,900,000		4,900,000
Total cost of repurchases	$ 40,868	$ 0	$ 81,643	$ 0
Common Stock and Capital in Excess of Par Value, Shares
Equity, Class of Treasury Stock
Number of shares of common stock repurchased (in shares)	388,000	0	822,000	0
Number of shares of common stock repurchased, not settled (in shares)			12,000
Shares of common stock repurchased, not settled			$ 1,300