Stockholders' Equity (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Amounts Reclassified from AOCI
Rent expense	$ (4,200)	$ (4,400)	$ (4,500)
Interest expense	(3,293)	(1,149)	(37)
Interest income	853	1,338	1,859
Income before income taxes	62,027	86,348	52,340
Income tax benefit	(12,208)	(22,800)	(16,868)
Net income	49,819	63,548	35,472
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	187	(350)	(1)
Reclassification for gains included in net income	81
Net changes to cash flow hedges
Unrealized gains (losses) arising during the period	(214)	335	148
Reclassification for losses included in net income	(196)	(803)	(783)
Other comprehensive income	(142)	(818)	(636)
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(328)	(2,295)	(2,237)
Income tax benefit	115	803	783
Net income	(213)	(1,492)	(1,454)
Losses on cash flow hedge | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Rent expense		(2,295)	(2,237)
Interest expense	(560)
Gains on available-for-sales securities | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest income	$ 232