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INCOME TAXES - Unrecognized Tax Benefits Roll Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized benefit—beginning of year $ 22,851 $ 19,590 $ 14,914
Gross increases—current year tax positions 5,184 3,879 4,960
Gross decreases - prior year tax positions due to statute lapse (597) (618) (284)
Unrecognized benefit—end of year $ 27,438 $ 22,851 $ 19,590