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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares) 4 6 5
Grant date fair value $ 760 $ 759 $ 759
Weighted average grant date fair value per award (in dollars per share) $ 180.16 $ 123.11 $ 138.96