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Severance (Details) - Employee severance - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Severance      
Severance costs   $ 4.4 $ 2.5
Former CEO      
Severance      
Severance costs $ 6.3    
Executives and other employees      
Severance      
Costs associated with accelerated vesting of equity awards $ 2.4 $ 1.0 $ 0.8