SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details) |
12 Months Ended |
|---|---|
Jun. 30, 2019 | |
| Minimum | |
| Significant Accounting Policies [Line Items] | |
| Credit terms | 30 days |
| Maximum | |
| Significant Accounting Policies [Line Items] | |
| Credit terms | 120 days |