Weighted Average Shares (Details)	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Weighted-average common and common-equivalent shares outstanding:
Basic weighted-average common shares outstanding	42,851,000	41,842,000	42,710,000	41,586,000
Effect of dilutive stock options	750,000	968,000	889,000	946,000
Diluted weighted-average common and common-equivalent shares outstanding	43,601,000	42,810,000	43,599,000	42,532,000
Weighted Average Shares (Textual) [Abstract]
Stock options to purchase antidilutive common stock	931,839	968,676	872,237	728,572