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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Statutory rate 35.00% 35.00% 35.00%
Tax rate differential, foreign income (23.30%) (24.40%) (23.20%)
State tax expense 0.30% (0.10%) 0.10%
Stock-based compensation (2.50%) 0.30% 0.60%
Federal research and development credits (0.40%) (0.60%) (1.10%)
Other permanent items 0.60% 0.80% (0.40%)
Effective tax rate 9.70% 11.00% 11.00%