Stock-Based Compensation (Allocation Of Stock-Based Compensation) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Stock-based compensation, pre-tax	$ 4,621	$ 7,206	$ 12,108	$ 15,506
Net change in stock-based compensation capitalized into inventory	42	61	(42)	(89)
Cost Of Sales [Member]
Stock-based compensation, pre-tax	195	646	474	1,172
Selling, General And Administrative [Member]
Stock-based compensation, pre-tax	2,666	4,702	8,284	10,306
Product Development And Engineering [Member]
Stock-based compensation, pre-tax	$ 1,760	$ 1,858	$ 3,350	$ 4,028

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration