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EMPLOYEE BENEFIT PLANS - Plan Assets and Investment Policy (Details)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Plan Assets and Investment Policy    
Expected Rate of Return (as a percent) 4.40% 4.70%
Combined    
Plan Assets and Investment Policy    
Proportion of Fair Value (as a percent) 100.00% 100.00%
Expected Rate of Return (as a percent) 4.40% 4.70%
Equity securities    
Plan Assets and Investment Policy    
Proportion of Fair Value (as a percent) 82.00% 83.00%
Expected Rate of Return (as a percent) 5.00% 6.00%
Debt securities    
Plan Assets and Investment Policy    
Proportion of Fair Value (as a percent) 17.00% 17.00%
Expected Rate of Return (as a percent) 1.00% 1.00%
Cash    
Plan Assets and Investment Policy    
Proportion of Fair Value (as a percent) 1.00%