EARNINGS PER SHARE - Factors (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jun. 30, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Factors used in the earnings per share computation
Net income									$ 39,653	$ 19,570	$ 10,210
Weighted average common shares - basic	18,619,834	18,622,083	18,619,834	18,615,100	18,593,501	18,593,296	18,592,936	18,591,808	18,619,793	18,592,885	17,849,319
Dilutive effect of assumed exercises of common stock warrants											88,060
Weighted average outstanding shares - diluted	18,702,352	18,728,424	18,702,352	18,686,626	18,659,246	18,625,904	18,605,078	18,592,603	18,714,531	18,620,708	18,257,007
Basic earnings per share (in dollars per share)	$ 0.71	$ 0.62	$ 0.43	$ 0.38	$ 0.34	$ 0.12	$ 0.22	$ 0.38	$ 2.13	$ 1.05	$ 0.57
Diluted earnings per share (in dollars per share)	$ 0.70	$ 0.61	$ 0.43	$ 0.38	$ 0.34	$ 0.12	$ 0.22	$ 0.38	$ 2.12	$ 1.05	$ 0.56
Stock options
Factors used in the earnings per share computation
Dilutive effect of assumed exercises of stock options and restricted share awards\units									38,835	4,488	50,775
Restricted stock awards
Factors used in the earnings per share computation
Dilutive effect of assumed exercises of stock options and restricted share awards\units									55,904	23,335	268,853