PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Retirement plan expenses	$ 2,300,000	$ 1,500,000	$ 8,400,000	$ 4,300,000
Accumulated benefit obligation, defined benefit pension plans	$ 178,300,000		178,300,000		$ 190,000,000
Actuarial gain (loss) expected to be recognized in net pension cost, remainder of 2015			(200,000)
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected contributions, remainder of 2015			1,800,000
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected contributions, remainder of 2015			$ 0
Fixed income securities [Member] | Pooled separate accounts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations			50.00%
Fixed income securities [Member] | Common collective trusts funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations			30.00%
Equity securities [Member] | Common collective trusts funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations			70.00%