Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 28, 2012		Jul. 30, 2011
Cash flows from operating activities:
Net income	$ 37,990		$ 38,364
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	13,746		12,595
Loss on disposals of property, plant and equipment	119		122
Non-cash equity compensation	1,434		1,369
Increase (decrease) in deferred taxes	(783)		1,151
Net (increase) in operating working capital and other components	(75,802)		(43,093)
Net cash provided by (used in) operating activities	(23,296)		10,508
Cash flows from investing activities:
Capital expenditures	(11,830)	[1]	(14,039)	[1]
Proceeds from maturities of short-term investments	246,580		189,789
Payments to acquire short-term investments	(239,837)		(176,975)
Net cash used in investing activities	(5,087)		(1,225)
Cash flows from financing activities:
Income tax benefit from equity compensation plans	6		1,883
Net proceeds from issuance of common stock	479		546
Tax payments related to equity compensation plans	(634)		0
Net cash provided by (used in) financing activities	(149)		2,429
Net increase (decrease) in cash and cash equivalents	(28,532)		11,712
Cash and cash equivalents - beginning of period	87,230		80,979
Cash and cash equivalents - end of period	$ 58,698		$ 92,691

[1] Capital expenditures include payments for property, plant and equipment made for the reportable segment.