Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 26, 2015	Dec. 27, 2014
Consolidated Balance Sheets [Abstract]
Common Stock, No 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
Deferred Tax, Other Comprehensive Income	$ 3,121	$ 3,371
Treasury Stock, Shares	6,149,364	6,149,364