FAIR VALUE AND MARKETABLE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012 Fixed Income Securities [Member] Maximum [Member]	Dec. 31, 2011 Fixed Income Securities [Member] Maximum [Member]	Dec. 31, 2011 U.S. Government Agency debt securities [Member] Minimum [Member]	Sep. 29, 2012 U.S. Government Agency debt securities [Member] Maximum [Member]	Sep. 29, 2012 Former-auction corporate debt security [Member] Minimum [Member]	Dec. 31, 2011 Former-auction corporate debt security [Member] Minimum [Member]	Dec. 31, 2011 Corporate Debt [Member] Minimum [Member]	Sep. 29, 2012 Municipal Notes [Member] Maximum [Member]	Sep. 29, 2012 State and Municipal Debt [Member] Minimum [Member]	Dec. 31, 2011 State and Municipal Debt [Member] Minimum [Member]	Sep. 29, 2012 Amortized Cost Basis [Member]		Dec. 31, 2011 Amortized Cost Basis [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] Fixed Income Securities [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] Fixed Income Securities [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] U.S. Government Agency debt securities [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] U.S. Government Agency debt securities [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] Former-auction corporate debt security [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] Former-auction corporate debt security [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] Preferred Equity Securities [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] Preferred Equity Securities [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] Corporate Debt [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] Municipal Notes [Member]		Sep. 29, 2012 Amortized Cost Basis [Member] State and Municipal Debt [Member]		Dec. 31, 2011 Amortized Cost Basis [Member] State and Municipal Debt [Member]		Sep. 29, 2012 Fair Value [Member]	Dec. 31, 2011 Fair Value [Member]	Sep. 29, 2012 Fair Value [Member] Fixed Income Securities [Member]		Dec. 31, 2011 Fair Value [Member] Fixed Income Securities [Member]		Sep. 29, 2012 Fair Value [Member] U.S. Government Agency debt securities [Member]		Dec. 31, 2011 Fair Value [Member] U.S. Government Agency debt securities [Member]		Sep. 29, 2012 Fair Value [Member] Former-auction corporate debt security [Member]		Dec. 31, 2011 Fair Value [Member] Former-auction corporate debt security [Member]		Sep. 29, 2012 Fair Value [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Fair Value [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Fair Value [Member] Corporate Debt [Member]		Sep. 29, 2012 Fair Value [Member] Municipal Notes [Member]		Sep. 29, 2012 Fair Value [Member] State and Municipal Debt [Member]		Dec. 31, 2011 Fair Value [Member] State and Municipal Debt [Member]		Sep. 29, 2012 Level 1 [Member]	Dec. 31, 2011 Level 1 [Member]	Sep. 29, 2012 Level 1 [Member] Fixed Income Securities [Member]		Dec. 31, 2011 Level 1 [Member] Fixed Income Securities [Member]		Sep. 29, 2012 Level 1 [Member] U.S. Government Agency debt securities [Member]		Dec. 31, 2011 Level 1 [Member] U.S. Government Agency debt securities [Member]		Sep. 29, 2012 Level 1 [Member] Former-auction corporate debt security [Member]		Dec. 31, 2011 Level 1 [Member] Former-auction corporate debt security [Member]		Sep. 29, 2012 Level 1 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 1 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 1 [Member] Corporate Debt [Member]		Sep. 29, 2012 Level 1 [Member] Municipal Notes [Member]		Sep. 29, 2012 Level 1 [Member] State and Municipal Debt [Member]		Dec. 31, 2011 Level 1 [Member] State and Municipal Debt [Member]		Sep. 29, 2012 Level 2 [Member]	Dec. 31, 2011 Level 2 [Member]	Sep. 29, 2012 Level 2 [Member] Fixed Income Securities [Member]		Dec. 31, 2011 Level 2 [Member] Fixed Income Securities [Member]		Sep. 29, 2012 Level 2 [Member] U.S. Government Agency debt securities [Member]		Dec. 31, 2011 Level 2 [Member] U.S. Government Agency debt securities [Member]		Sep. 29, 2012 Level 2 [Member] Former-auction corporate debt security [Member]		Dec. 31, 2011 Level 2 [Member] Former-auction corporate debt security [Member]		Sep. 29, 2012 Level 2 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 2 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 2 [Member] Corporate Debt [Member]		Sep. 29, 2012 Level 2 [Member] Municipal Notes [Member]		Sep. 29, 2012 Level 2 [Member] State and Municipal Debt [Member]		Dec. 31, 2011 Level 2 [Member] State and Municipal Debt [Member]		Sep. 29, 2012 Level 3 [Member]	Dec. 31, 2011 Level 3 [Member]	Sep. 29, 2012 Level 3 [Member] Fixed Income Securities [Member]		Dec. 31, 2011 Level 3 [Member] Fixed Income Securities [Member]		Sep. 29, 2012 Level 3 [Member] U.S. Government Agency debt securities [Member]		Dec. 31, 2011 Level 3 [Member] U.S. Government Agency debt securities [Member]		Sep. 29, 2012 Level 3 [Member] Former-auction corporate debt security [Member]		Dec. 31, 2011 Level 3 [Member] Former-auction corporate debt security [Member]		Sep. 29, 2012 Level 3 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 3 [Member] Preferred Equity Securities [Member]	Dec. 31, 2011 Level 3 [Member] Corporate Debt [Member]		Sep. 29, 2012 Level 3 [Member] Municipal Notes [Member]		Sep. 29, 2012 Level 3 [Member] State and Municipal Debt [Member]		Dec. 31, 2011 Level 3 [Member] State and Municipal Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities													$ 49,000	[1]	$ 58,428	[1]	$ 20,892	[1],[2]	$ 32,574	[1],[2]	$ 21,516	[1],[2]	$ 19,573	[1],[2]	$ 1,725	[1],[3]	$ 1,681	[1],[3]	$ 2,404	[1]	$ 2,404	[1]	$ 762	[1],[3]	$ 1,082	[1],[2]	$ 1,381	[1],[3]	$ 1,434	[1],[3]	$ 51,854	$ 60,883	$ 20,905	[2]	$ 32,532	[2]	$ 21,519	[2]	$ 19,556	[2]	$ 2,786	[3]	$ 2,834	[3]	$ 3,904	$ 3,031	$ 1,215	[3]	$ 1,082	[2]	$ 1,658	[3]	$ 1,715	[3]	$ 21,519	$ 19,556	$ 0	[2]	$ 0	[2]	$ 21,519	[2]	$ 19,556	[2]	$ 0	[3]	$ 0	[3]	$ 0	$ 0	$ 0	[3]	$ 0	[2]	$ 0	[3]	$ 0	[3]	$ 28,804	$ 39,484	$ 20,905	[2]	$ 32,532	[2]	$ 0	[2]	$ 0	[2]	$ 2,786	[3]	$ 2,834	[3]	$ 2,373	$ 2,403	$ 0	[3]	$ 1,082	[2]	$ 1,658	[3]	$ 1,715	[3]	$ 1,531	$ 1,843	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 0	[3]	$ 0	[3]	$ 1,531	$ 628	$ 1,215	[3]	$ 0	[2]	$ 0	[3]	$ 0	[3]
Contractual maturities (in years)			2 years	2 years	2 years	2 years	10 years	10 years	10 years	2 years	10 years	10 years
Interest income recognized to accrete amortized cost basis of existing and former-auction debt securities	$ 90	$ 136

[1] Difference between amortized cost basis and fair value represents gross unrealized gain or loss.

[2] Available for sale debt securities with contractual maturities of 2 years or less.

[3] Available for sale debt securities with contractual maturities in excess of 10 years.