PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Plan Asset Allocations) (Details)	Dec. 31, 2017	Dec. 25, 2016
Defined Benefit Plan Disclosure [Line Items]
Total assets	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	5.00%	0.00%
Equity securities | Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Total assets	5.00%	5.00%
Equity securities | Common collective trusts funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	56.00%	60.00%
Fixed income securities | Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Total assets	4.00%	5.00%
Fixed income securities | Common collective trusts funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	30.00%	30.00%