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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Impact of New Accounting Pronouncement) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting standard compared to old standard $ 496 $ 0 $ 0
Effect of adoption of new accounting standard compared to old standard, EPS $ 0.02    
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted The amendments relating to the presentation of excess tax benefits and tax deficiencies in the statement of cash flows were applied retrospectively. The effect of the retrospective adjustment was to eliminate the presentation of an operating cash outflow and a financing cash inflow for excess tax benefits on exercised stock options and vesting of deferred shares. These eliminations decreased net cash provided by operating activities by $3.3 million and decreased net cash used by financing activities by $3.3 million for the year ended June 30, 2016, and decreased net cash provided by operating activities by $1.8 million and increased cash provided by financing activities by $1.8 million for the year ended June 30, 2015. Net cash flows did not change in either year as a result of the retrospective adjustment.