Condensed Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 25, 2012	Dec. 25, 2011
Trade receivables, allowance	$ 8,416	$ 7,341
Common stock, par value	$ 0.01	$ 0.01
Treasury stock, shares	700,840	260,170
Common Class A [Member]
Shares authorized	200,000,000	200,000,000
Shares issued	61,638,066	60,865,566
Common Class B [Member]
Shares authorized	60,000,000	60,000,000
Shares issued	24,800,962	24,800,962