POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - ESOP Shares Outstanding (Details) - shares shares in Thousands	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Series A Preferred Stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Allocated (in shares)	20,648	22,724	24,449
Unallocated (in shares)	0	0	535
TOTAL (in shares)	20,648	22,724	24,984
Series B Preferred Stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Allocated (in shares)	34,965	33,723	32,172
Unallocated (in shares)	14,142	15,864	17,867
TOTAL (in shares)	49,107	49,587	50,039