EMPLOYEE BENEFIT PLANS - Schedule of Weighted Average Assumptions Used to Estimate the Actuarial Present Value of Benefit Obligations and Retirement Income and Retirement Health Care Costs (Details)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Other Postretirement Benefits Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.41%	5.52%
Rate of compensation increase	3.32%	3.23%
Interest crediting rate	5.90%	5.40%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.52%	4.63%	3.72%
Rate of compensation increase	3.23%	3.20%	3.09%
Expected return on plan assets	5.69%	3.39%	2.67%
Interest crediting rate	5.40%	2.69%	2.69%
Retirement Health Care
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.28%	5.38%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.38%	5.10%	4.65%