Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 28, 2012		Apr. 30, 2011
Cash flows from operating activities:
Net income	$ 14,832		$ 17,810
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	6,820		6,246
Loss on disposals of property, plant and equipment	42		61
Non-cash equity compensation	599		558
Increase (decrease) in deferred taxes	(655)		418
Net (increase) in operating working capital and other components	(78,890)		(37,978)
Net cash (used in) operating activities	(57,252)		(12,885)
Cash flows from investing activities:
Capital expenditures	(5,937)	[1]	(5,592)	[1]
Proceeds from maturities of short-term investments	118,958		179,814
Payments to acquire short-term investments	(112,270)		(158,979)
Net cash provided by investing activities	751		15,243
Cash flows from financing activities:
Income tax benefit from equity compensation plans	14		61
Net proceeds from issuance of common stock	0		67
Tax payments related to equity compensation plans	(372)		0
Net cash provided by (used in) financing activities	(358)		128
Net increase (decrease) in cash and cash equivalents	(56,859)		2,486
Cash and cash equivalents - beginning of period	87,230		80,979
Cash and cash equivalents - end of period	$ 30,371		$ 83,465

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