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EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($) | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Defined benefit plan, target plan asset allocations | 100.00% | 100.00% |
Defined benefit plan, estimated future employer contributions in next fiscal year | $ 4,300,000 |  |
Defined benefit plan maximum yearly expected future benefit | 5,100,000 |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 37,928,000 | $ 33,555,000 | $ 27,932,000
Recurring |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 37,928,000 | 33,555,000 |
Recurring | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 21,420,000 | 18,571,000 |
Recurring | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 16,508,000 | 14,984,000 |
Recurring | Cash and cash equivalents |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 21,420,000 | 18,571,000 |
Recurring | Cash and cash equivalents | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 21,420,000 | 18,571,000 |
Recurring | Cash and cash equivalents | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 0 | 0 |
Recurring | Bonds, equity securities and other investments |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 16,508,000 | 14,984,000 |
Recurring | Bonds, equity securities and other investments | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 0 | 0 |
Recurring | Bonds, equity securities and other investments | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | $ 16,508,000 | $ 14,984,000 |

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