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Share-Based Compensation - Valuation Assumptions (Details) - $ / shares
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value (dollars per share)   $ 2.25  
Risk-free interest rate   2.30%  
Expected volatility - Company (as a percent)   59.00%  
Total measurement period (years)   4 years 8 months 12 days  
Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value (dollars per share) $ 12.98 $ 0 $ 4.69
Risk-free interest rate     1.50%
Dividend yield (as a percent)     0.00%
Expected volatility - Company (as a percent)     62.00%
Expected volatility - peer company (as a percent)     17.10%
Total measurement period (years)     2 years 9 months 18 days
Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value (dollars per share)   $ 0.40  
Minimum | Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   2.10%  
Expected volatility - Company (as a percent)   56.20%  
Total measurement period (years)   6 months  
Maximum | Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   2.30%  
Expected volatility - Company (as a percent)   57.00%  
Total measurement period (years)   9 months 18 days