Stock-Based Compensation (Nonemployee Director Restricted Stock Grant Details) (Details) - Director Restricted Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	6	5	6
Grant date fair value	$ 759	$ 759	$ 639
Weighted average grant date fair value per award (in dollars per share)	$ 123.11	$ 138.96	$ 112.05