PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Plan Asset Allocations) (Details)	Dec. 27, 2015	Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Total assets	100.00%	100.00%
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.00%	0.00%
Equity securities [Member] | Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	7.00%	6.00%
Equity securities [Member] | Common collective trusts funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	57.00%	60.00%
Fixed income securities [Member] | Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	7.00%	6.00%
Fixed income securities [Member] | Common collective trusts funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	29.00%	28.00%