PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012		Dec. 25, 2011	Dec. 26, 2010
Change in plan assets:
Fair value of plan assets, end of year	$ 108,496	$ 92,283	[1]
Pension Plans, Defined Benefit [Member]
Change in projected benefit obligation:
Projected benefit obligation, beginning of year	194,434	167,931
Service cost		51		173
Interest cost	7,954	8,272		8,213
Actuarial losses (gains)	(24,315)	24,872
Benefits paid	(8,043)	(6,692)
Curtailments and settlements
Projected benefit obligation, end of year	170,030	194,434		167,931
Change in plan assets:
Fair value of plan assets, beginning of year	92,283	81,193
Actual return on plan assets	16,489	8,013
Contributions by employer	7,767	9,769
Benefits paid	(8,043)	(6,692)
Curtailments and settlements
Fair value of plan assets, end of year	108,496	92,283		81,193
Funded status:
Unfunded benefit obligation, end of year	(61,534)	(102,151)
Amounts recognized in the Consolidated Balance Sheets at end of year:
Current liability	(9,146)	(6,656)
Long-term liability	(52,388)	(95,495)
Recognized liability	(61,534)	(102,151)
Amounts recognized in accumulated other comprehensive loss at end of year:
Net actuarial loss (gain)	16,957	53,368		31,108	9,708
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in projected benefit obligation:
Projected benefit obligation, beginning of year	1,933	1,961
Service cost
Interest cost	78	96
Actuarial losses (gains)	(92)	159
Benefits paid
Curtailments and settlements	(214)	(283)
Projected benefit obligation, end of year	1,705	1,933
Change in plan assets:
Fair value of plan assets, beginning of year
Actual return on plan assets
Contributions by employer	214	283
Benefits paid
Curtailments and settlements	(214)	(283)
Fair value of plan assets, end of year
Funded status:
Unfunded benefit obligation, end of year	(1,705)	(1,933)
Amounts recognized in the Consolidated Balance Sheets at end of year:
Current liability	(148)	(158)
Long-term liability	(1,557)	(1,775)
Recognized liability	(1,705)	(1,933)
Amounts recognized in accumulated other comprehensive loss at end of year:
Net actuarial loss (gain)	$ (126)	$ (49)		$ (217)	$ (47)

[1] We have made certain reclassifications to the December 30, 2012 fair value hierarchy with no impact to total reported plan assets in order to conform to the December 29, 2013 presentation.