Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Earnings Per Share
Net income	$ 49,819	$ 63,548	$ 35,472
Shares used in computing basic earnings per share	42,715,000	42,136,000	43,421,000
Effect of dilutive securities:
Stock options and other stock-based awards (in shares)	822,000	970,000	1,411,000
Shares used in computing diluted earnings per share	43,537,000	43,106,000	44,832,000
Earnings per share:
Basic (in dollars per share)	$ 1.17	$ 1.51	$ 0.82
Diluted (in dollars per share)	$ 1.14	$ 1.47	$ 0.79
Shares excluded from computation of diluted earning per share	400,000	500,000	400,000