Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Dividends, per share	$ 0.89	$ 0.53	$ 0.46
Contribution of shares to retirement plans, shares	12,451	12,508	14,363
Acquired shares from stockholders, shares	24,889	23,513	23,731
Sale of shares to stockholders, shares	8,857	9,711	9,771
Retirement of shares, shares	16,076	14,278	14,820