Business and Reporting Policies (Summary of Selling Days) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2011 days	Sep. 30, 2011 days	Jul. 01, 2011 days	Apr. 01, 2011 days percent	Dec. 31, 2010 days	Oct. 01, 2010 days	Jul. 02, 2010 days	Apr. 02, 2010 days	Dec. 31, 2011 days	Dec. 31, 2010 days
Business and Reporting Policies
Number of selling days	65	65	65	65	65	65	65	66	260	261
Year over year change in number of selling days	0	0	0	(1)					(1)