CONCENTRATIONS - Summary of major suppliers and customers (Details)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Supplier Concentration Risk | Company A | Subcontractors
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%
Supplier Concentration Risk | Company A | Accounts Payable
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company M | Sales
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company M | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company N | Sales
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company N | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company O | Sales
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%
Customer Concentration Risk | Company O | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company P | Sales
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%
Customer Concentration Risk | Company P | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%