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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Receivables and Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]      
Allowance for doubtful accounts $ 6,899 $ 2,025 $ 1,200
Cash surrender value of life insurance     $ 24,600