POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - TARGET AND ACTUAL ASSET ALLOCATION (DETAILS)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Pension Benefits
Asset Allocation
Target Asset Allocations	100.00%
Actual Asset Allocations	100.00%	100.00%
Other Retiree Benefits
Asset Allocation
Target Asset Allocations	100.00%
Actual Asset Allocations	100.00%	100.00%
Cash and Cash Equivalents | Pension Benefits
Asset Allocation
Target Asset Allocations	2.00%
Actual Asset Allocations	1.00%	2.00%
Cash and Cash Equivalents | Other Retiree Benefits
Asset Allocation
Target Asset Allocations	2.00%
Actual Asset Allocations	1.00%	1.00%
Debt Securities | Pension Benefits
Asset Allocation
Target Asset Allocations	51.00%
Actual Asset Allocations	52.00%	52.00%
Debt Securities | Other Retiree Benefits
Asset Allocation
Target Asset Allocations	8.00%
Actual Asset Allocations	9.00%	8.00%
Equity Securities | Pension Benefits
Asset Allocation
Target Asset Allocations	47.00%
Actual Asset Allocations	47.00%	46.00%
Equity Securities | Other Retiree Benefits
Asset Allocation
Target Asset Allocations	90.00%
Actual Asset Allocations	90.00%	91.00%