CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Trade receivables, allowance	$ 5,920	$ 7,341
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Treasury stock, shares	6,034	260,170
Common Class A
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	61,098,820	60,865,566
Common Class B
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	24,800,962	24,800,962