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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair values of financial assets and liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Fair Value of Financial Instruments
Liabilities - Contingent payment obligations	$ 15,713	$ 11,840
Recurring
Fair Value of Financial Instruments
Equity securities		254
Insurance company contracts	31,897	26,940
Interest rate contract	18	20
Total assets	31,915	27,214
Liabilities - Contingent payment obligations	15,713	11,840
Recurring | Level 1
Fair Value of Financial Instruments
Equity securities		254
Total assets		254
Recurring | Level 2
Fair Value of Financial Instruments
Insurance company contracts	31,897	26,940
Interest rate contract	18	20
Total assets	31,915	26,960
Recurring | Level 3
Fair Value of Financial Instruments
Fair value of assets	0	0
Liabilities - Contingent payment obligations	$ 15,713	$ 11,840

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

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