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STOCK-BASED COMPENSATION - OPTIONS (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Stock options, number of shares      
Exercised (in shares) (48,123) (17,198) (2,500)
Stock options      
Stock options, number of shares      
Outstanding at the beginning of the period (in shares) 107,825    
Granted (in shares) 6,858    
Exercised (in shares) (48,123)    
Forfeited (in shares) (333)    
Outstanding at the end of the period (in shares) 66,227 107,825  
Exercisable at the end of the period (in shares) 48,957    
Stock options, weighted-average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 64.13    
Granted (in dollars per share) 87.42    
Exercised (in dollars per share) 60.18    
Forfeited (in dollars per share) 56.54    
Outstanding at the end of the period (in dollars per share) 69.35 $ 64.13  
Exercisable at the end of the period (in dollars per share) $ 68.36    
Stock options, weighted-average remaining contractual life (in years)      
Outstanding at the end of the period 6 years 2 months 12 days    
Exercisable at the end of the period 5 years 7 months 6 days    
Stock options, Aggregate Intrinsic Value      
Outstanding at the end of the period $ 1,549    
Exercisable at the end of the period $ 1,199    
Other stock-based compensation      
Granted (in dollars per share) $ 27.12 $ 29.54 $ 18.05
Intrinsic value of options exercised $ 1,400 $ 500 $ 100
Unrecognized compensation expense $ 200    
Weighted-average vesting period (years) 1 year 7 months 6 days