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Severance (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Former CEO      
Severance      
Severance costs $ 1.5 $ 1.0 $ 6.3
Executives and other employees      
Severance      
Costs associated with accelerated vesting of equity awards $ 0.1 $ 0.1 $ 2.4