INVESTMENTS IN AFFILIATES - Schedule of equity method investments (Details) - Empire Education Group Inc - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Summarized Balance Sheet information:
Current assets	$ 40,990	$ 32,649	$ 46,733
Noncurrent assets	37,875	39,211	42,380
Current liabilities	21,897	18,385	18,160
Noncurrent liabilities	23,243	12,181	28,756
Summarized Statement of Operations information:
Gross revenue	130,082	125,486	130,302
Gross profit	40,194	41,097	34,585
Operating (loss) income	(2,239)	(651)	(5,857)
Net (loss) income	$ (2,551)	$ (899)	$ (5,551)