Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 29, 2012	Dec. 31, 2011
Shareholders' Equity
Treasury stock, shares	8,014,000	7,580,000
Class A [Member]
Shareholders' Equity
Common stock, par value	1	1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,177,000	18,713,000
Common stock, shares outstanding	11,163,000	11,133,000
Class B [Member]
Shareholders' Equity
Common stock, par value	1	1
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	1,805,000	1,805,000
Common stock, shares outstanding	1,805,000	1,805,000