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Share-based Compensation - Employee Stock Purchase Plan (Details) - shares
shares in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Apr. 01, 2003
Stock-based Compensation        
Shares authorized for issuance (in shares) 6,500      
Employee Stock Purchase Plan        
Stock-based Compensation        
Purchase price of stock as percent of market fair value (in percent) 85.00%      
Compensation authorized by the employee to be withheld for stock purchase (in percent) 10.00%      
Shares authorized for issuance (in shares)       1,100
Shares issued (in shares) 118 185 66  
Cumulative shares issued (in shares) 910