SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			$ (481,316)
Other comprehensive income (loss) before reclassifications			(731)
Amounts reclassified from AOCL			6,773
Other comprehensive income	3,330	1,002	6,042	2,007
Balance at the end of the period	(475,274)		(475,274)
Compensation	108,157	108,086	220,733	220,735
Provision for income taxes	7,880	(3,532)	2,155	(5,444)
Net of tax	(11,752)	(26,865)	989	(24,778)
Minimum Pension and Post-Retirement Liability
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			(473,448)
Amounts reclassified from AOCL			6,773
Other comprehensive income			6,773
Balance at the end of the period	(466,675)		(466,675)
Minimum Pension and Post-Retirement Liability | Amount Reclassified from AOCI
Changes in accumulated other comprehensive loss
Compensation	5,664		11,289
Provision for income taxes	(2,266)		(4,516)
Net of tax	3,398		6,773
Other Comprehensive Loss Related to Equity Investments
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			(7,868)
Other comprehensive income (loss) before reclassifications			(731)
Other comprehensive income			(731)
Balance at the end of the period	$ (8,599)		$ (8,599)