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Stock-Based Employee Compensation (Narrative) (Details) - Performance Restricted Stock Units (PRSUs) [Member] - $ / shares
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance restricted stock units granted 167,000 243,000
Relative total shareholder return period 3 years 3 years
Maximum amount of performance restricted stock units to be issued, percentage of the original grant 200.00% 200.00%
Weighted average fair value of performance restricted stock units granted $ 76.20 $ 51.60