Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts and customer credits	$ 83,593	$ 65,879
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	36,321,143	36,464,958
Common stock, shares outstanding	36,321,143	36,464,958