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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
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Accounting Policies [Abstract] |  |  |
Allowance for doubtful accounts | $ 2,000 | $ 1,200 | $ 800
Cash surrender value of life insurance |  | $ 24,600 |

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