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INCOME TAXES - Rollforward of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Rollforward of unrecognized tax benefits      
Balance at beginning of period $ 1,388 $ 1,357 $ 1,496
Additions based on tax positions related to the current year 553 259 138
Additions based on tax positions of prior years 1,608 80 170
Reductions on tax positions related to the expiration of the statute of limitations (177) (179) (207)
Settlements (345) (129) (240)
Balance at end of period $ 3,027 $ 1,388 $ 1,357