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Share-Based Compensation - Restricted Stock (Details) - Restricted stock - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Stock-based Compensation      
Annual forfeiture rate used to calculate compensation expense (as a percent) 5.70% 6.50% 6.50%
Awards      
Non-vested at the beginning of the period (in shares) 334 167 98
Granted (in shares) 641 298 147
Vested (in shares) (191) (86) (66)
Forfeited (in shares) (80) (45) (12)
Non-vested at the end of the period (in shares) 704 334 167
Weighted Average Grant-date Fair Value      
Non-vested at the beginning of the period (in dollars per share) $ 30.71 $ 48.22 $ 37.83
Granted (in dollars per share) 18.01 24.73 54.64
Vested (in dollars per share) 31.30 42.60 47.11
Forfeited (in dollars per share) 20.95 32.90 47.67
Non-vested at the end of the period (in dollars per share) $ 20.06 $ 30.71 $ 48.22
Aggregate Intrinsic Value      
Vested $ 4,104 $ 2,564 $ 3,511