Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 25, 2011	Dec. 26, 2010
Trade receivables, allowance	$ 7,341	$ 7,836
Common stock, par value	$ 0.01	$ 0.01
Treasury stock, shares	260,170	116,045
Common Class A [Member]
Shares authorized	200,000,000	200,000,000
Shares issued	60,865,566	60,278,448
Common Class B [Member]
Shares authorized	60,000,000	60,000,000
Shares issued	24,800,962	24,800,962