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Share-Based Compensation - Performance Restricted Stock Units, Narrative (Details) - Performance Restricted Stock Units - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 348,000 0 420,000
Vesting period   3 years 3 years
Distribution period following performance period     30 days
Shares vested (in shares) 479,000 0 10,000
Fair value of vested awards $ 6.3   $ 0.1
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Distribution percentage of target number of Performance Stock Units     0.00%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Distribution percentage of target number of Performance Stock Units     200.00%
Company's TSR Compared to a Matrix      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting right percentage     50.00%
Company's TSR Compared to Vanguard Russell 2000 Exchange Trade Fund      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting right percentage     50.00%