Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Dividends, per share	$ 0.70	$ 0.89	$ 0.53
Contribution of shares to retirement plans	12,967	12,451	12,508
Acquisition of shares from stockholders	21,602	24,889	23,513
Sale of shares to stockholders	9,262	8,857	9,711
Retirement of shares	11,196	16,076	14,278