PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Pension Plans, Defined Benefit [Member]
Service cost	$ 51	$ 173	$ 165
Interest cost	8,272	8,213	8,659
Estimated return on plan assets	(5,867)	(6,177)	(6,117)
Curtailment loss	0	16	36
Settlement loss (gain)	0	0	1,504
Amortization of prior service cost	0	3	3
Amortization of net loss (gain)	465	96	1
Net cost	2,921	2,324	4,251
Other Pension Plans, Defined Benefit [Member]
Service cost	0	0	0
Interest cost	96	112	115
Estimated return on plan assets	0	0	0
Curtailment loss	0	0	0
Settlement loss (gain)	(7)	0	0
Amortization of prior service cost	0	0	0
Amortization of net loss (gain)	(2)	0	0
Net cost	$ 87	$ 112	$ 115