SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 23, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Changes in accumulated other comprehensive loss
Balance at the beginning of the period				$ (481,316)					$ (481,316)
Other comprehensive income (loss) before reclassifications									(364)
Amounts reclassified from AOCL									176,779
Other comprehensive income (loss)									176,415	(133,662)	(100,593)
Balance at the end of the period	(304,901)				(481,316)				(304,901)	(481,316)
Compensation									432,255	443,401	457,707
Provision for income taxes									13,256	(21,382)	8,396
Net of tax	(12,527)	(7,265)	(11,752)	12,741	30,015	(5,093)	(26,865)	2,087	(18,803)	144	(54,389)
Minimum Pension and Post-Retirement Liability
Changes in accumulated other comprehensive loss
Balance at the beginning of the period				(473,448)					(473,448)
Amounts reclassified from AOCL									176,779
Other comprehensive income (loss)									176,779
Balance at the end of the period	(296,669)								(296,669)
Minimum Pension and Post-Retirement Liability | Amount Reclassified from AOCI
Changes in accumulated other comprehensive loss
Compensation									294,632
Provision for income taxes									(117,853)
Net of tax									176,779
Other Comprehensive Loss Related to Equity Investments
Changes in accumulated other comprehensive loss
Balance at the beginning of the period				(7,868)					(7,868)
Other comprehensive income (loss) before reclassifications									(364)
Other comprehensive income (loss)									(364)
Balance at the end of the period	$ (8,232)								$ (8,232)