Note 9. Intangible Assets (Detail) - Intangible Assets (USD $) In Thousands, unless otherwise specified	Jul. 28, 2012	Jan. 28, 2012
Accumulated amortization	$ (55,470)	$ (52,526)
Intangible assets, net	43,272	45,656
Acquired Intangible Assets [Member]
Intangible assets	76,285	75,978
Purchased IP [Member]
Intangible assets	22,457	22,204
Acquired intangible assets subtotal [Member]
Intangible assets	98,742	98,182
Accumulated amortization	$ (55,470)	$ (52,526)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant