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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