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Share-Based Compensation - Other Than Options Valuation Assumptions (Details) - Performance Restricted Stock Units
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.49% 1.31% 1.07%
Dividend yield 0.00% 0.00% 0.00%
Expected volatility - Company 62.00% 55.50% 54.10%
Expected volatility - peer company 17.10% 15.70% 15.70%
Total measurement period (years) 2 years 9 months 3 years 3 years