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EMPLOYEE BENEFIT PLANS - Weighted Average Assumptions (Details) | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Retirement Benefits [Abstract] |  |  |
Discount rate, minimum | 0.60% | 0.30% | 0.50%
Discount rate, maximum | 1.70% | 1.70% | 2.30%
Expected rate of return on assets, minimum | 0.80% | 1.00% | 1.30%
Expected rate of return on assets, maximum | 2.90% | 2.90% | 2.90%
Rate of compensation increase, minimum | 1.80% | 1.80% | 3.00%
Rate of compensation increase, maximum | 4.50% | 4.50% | 4.50%

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