EMPLOYEE BENEFITS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013 item	Sep. 23, 2012
EMPLOYEE BENEFITS
Number of new participants			0
Retirement expense for continuing operations
Total retirement expense-net	$ 3,041	$ 438	$ 9,122	$ 1,312
Pension plan
Retirement expense for continuing operations
Service cost	1,386	1,385	4,159	4,155
Interest cost	21,149	22,974	63,447	68,923
Expected return on plan assets	(25,263)	(26,940)	(75,790)	(80,820)
Prior service cost amortization	4	4	11	11
Actuarial loss	6,389	3,172	19,168	9,515
Total retirement expense-net	3,665	595	10,995	1,784
Post-retirement plans
Retirement expense for continuing operations
Total retirement expense-net	$ (624)	$ (157)	$ (1,873)	$ (472)