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EMPLOYEE BENEFIT PLANS (Weighted-Average Assumptions Used to Estimate the Net Periodic Pension and Other Postretirement Benefit Costs) (Details)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Retirement Health Care [Member] | Retirement Health Care [Member]      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.51% 3.35%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.35% 4.01% 3.66%
Retirement Income [Member] | Retirement Income [Member]      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.45% 3.41%  
Rate of compensation increase 2.92% 2.86%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.41% 4.10% 3.70%
Rate of compensation increase 2.86% 2.87% 2.83%
Expected return on plan assets 3.95% 4.33% 4.43%