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Employee Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Employee Benefits      
Minimum length of service for participation 30 days    
Company match percentage of participant's compensation 25.00%    
Percentage of participant's compensation that company matches on 4.00%    
401(k) Plan expense $ 1.8 $ 1.6 $ 1.4