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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair values of financial assets and liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Fair Value of Financial Instruments |  |
Liabilities-contingent consideration | $ 19,431 | $ 13,867
Recurring |  |
Fair Value of Financial Instruments |  |
Assets - Insurance company contracts | 47,113 | 37,155
Liabilities-contingent consideration | 19,431 | 13,867
Recurring | Level 2 |  |
Fair Value of Financial Instruments |  |
Assets - Insurance company contracts | 47,113 | 37,155
Recurring | Level 3 |  |
Fair Value of Financial Instruments |  |
Liabilities-contingent consideration | $ 19,431 | $ 13,867

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