Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 30, 2012	Jul. 01, 2012
Allowance for doubtful accounts	$ 1,667	$ 1,490	$ 1,543
Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	10,203,821	10,203,821	10,203,821
Treasury stock, shares	3,062,374	3,062,374	3,062,374
Class B Common Stock [Member]
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000	10,000,000
Common stock, shares issued	2,737,076	2,716,956	2,716,956
Treasury stock, shares	628,114	628,114	628,114