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EARNINGS PER SHARE - Anti-dilutive Securities (Details) - shares
shares in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock (in shares) 18 8 2