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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Period Increase (Decrease) $ 0 $ 0 $ 0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost $ 1,600,000