Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 27, 2012		Oct. 29, 2011
Cash flows from operating activities:
Net income	$ 51,295		$ 53,346
Adjustments to reconcile net income to net cash (used in) operating activities:
Depreciation and amortization	20,910		19,173
Loss on disposals of property, plant and equipment	207		221
Non-cash equity compensation	1,688		2,040
Increase (decrease) in deferred taxes	(915)		3,141
Net (increase) in operating working capital and other components	(102,821)		(84,837)
Net cash (used in) operating activities	(29,636)		(6,916)
Cash flows from investing activities:
Capital expenditures	(22,423)	[1]	(26,215)	[1]
Proceeds from maturities of short-term investments	352,522		348,768
Payments to acquire short-term investments	(358,755)		(283,605)
Net cash provided by (used in) investing activities	(28,656)		38,948
Cash flows from financing activities:
Income tax benefit from equity compensation plans	72		1,883
Net proceeds from issuance of common stock	556		546
Tax payments related to equity compensation plans	(634)		0
Net cash provided by (used in) financing activities	(6)		2,429
Net increase (decrease) in cash and cash equivalents	(58,298)		34,461
Cash and cash equivalents - beginning of period	87,230		80,979
Cash and cash equivalents - end of period	$ 28,932		$ 115,440

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