Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jul. 03, 2016	Jan. 03, 2016	Jun. 28, 2015
Allowance for doubtful accounts	$ 2,678	$ 2,117	$ 1,517
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	2,799,816	2,778,896	2,778,896
Treasury stock, shares	628,114	628,114	628,114