STOCK-BASED COMPENSATION - OPTIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Stock options, number of shares
Exercised (in shares)	(17,198)	(2,500)	(20,488)
Stock options
Stock options, number of shares
Outstanding at the beginning of the period (in shares)	117,823
Granted (in shares)	7,200
Exercised (in shares)	(17,198)
Outstanding at the end of the period (in shares)	107,825	117,823
Exercisable at the end of the period (in shares)	77,310
Stock options, weighted-average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 59.04
Granted (in dollars per share)	83.29
Exercised (in dollars per share)	37.30
Outstanding at the end of the period (in dollars per share)	64.13	$ 59.04
Exercisable at the end of the period (in dollars per share)	$ 63.32
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 6 months
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 1,551
Exercisable at the end of the period	$ 1,148
Other stock-based compensation
Granted (in dollars per share)	$ 29.54	$ 18.05	$ 24.86
Intrinsic value of options exercised	$ 500	$ 100	$ 700
Unrecognized compensation expense	$ 300
Weighted-average vesting period (years)	1 year 6 months