RETIREMENT BENEFIT OBLIGATIONS - Schedule of Weighted-Average Asset Allocations, by Asset Category (Details)	Jun. 30, 2026	Jun. 30, 2025
Asset Category:
Benefit plan weighted-average asset allocations	100.00%	100.00%
Equity securities
Asset Category:
Benefit plan weighted-average asset allocations	6.00%	10.00%
Debt securities
Asset Category:
Benefit plan weighted-average asset allocations	89.00%	84.00%
Cash and other
Asset Category:
Benefit plan weighted-average asset allocations	5.00%	6.00%