Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Condensed Consolidated Balance Sheets
Accounts receivable, allowances for doubtful accounts (in dollars)	$ 784	$ 797
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000	250,000
Common stock, shares issued	42,490	42,779
Common stock, shares outstanding	42,490	42,779