Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 30, 2017	Dec. 31, 2016
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	100,800,000	100,800,000
Common stock, shares issued	33,047,807	33,047,807
Common stock, shares outstanding	26,898,443	26,898,443
Treasury stock, shares	6,149,364	6,149,364