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INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Beginning of year balance $ 5,043 $ 4,381 $ 3,436
Increases in prior period tax positions 12,965 101 318
Decreases in prior period tax positions (179) (870) (201)
Reductions on settlements and lapse in statute of limitations (611) (22) (721)
Increases in current period tax positions 1,261 1,453 1,549
End of year balance $ 18,479 $ 5,043 $ 4,381