Note 9. Intangible Assets (Detail) - Acquired Intangible Assets, Subject to Amortization (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jul. 28, 2012	Jan. 28, 2012
Acquired Intangible Gross Value	$ 164,912	$ 164,352
Acquired Intangible Impairment	(66,170)	(66,170)
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(55,470)	(52,526)
Acquired Intangible Net Value	43,272	45,656
Developed Technology Rights [Member]
Acquired Intangible Gross Value	76,603	75,827
Acquired Intangible Impairment	(24,614)	(24,614)
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(31,245)	(28,455)
Acquired Intangible Net Value	20,744	22,758
Acquired Intangible Weighted Average remaining amortization period (years)	4 years 73 days	4 years 255 days
Customer Relationships [Member]
Acquired Intangible Gross Value	50,706	51,174
Acquired Intangible Impairment	(30,486)	(30,486)
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(15,130)	(14,966)
Acquired Intangible Net Value	5,090	5,722
Acquired Intangible Weighted Average remaining amortization period (years)	4 years 109 days	4 years 292 days
Intellectual Property [Member]
Acquired Intangible Gross Value	7,398	8,395
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(5,803)	(5,900)
Acquired Intangible Net Value	1,595	2,495
Acquired Intangible Weighted Average remaining amortization period (years)	1 year 255 days	1 year 328 days
Trademarks [Member]
Acquired Intangible Gross Value	2,676	2,677
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(1,892)	(1,805)
Acquired Intangible Net Value	784	872
Acquired Intangible Weighted Average remaining amortization period (years)	6 years 109 days	6 years 219 days
Noncompete Agreements [Member]
Acquired Intangible Gross Value	1,400	1,400
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(1,400)	(1,400)
Acquired intangible assets subtotal [Member]
Acquired Intangible Gross Value	138,783	139,473
Acquired Intangible Impairment	(55,100)	(55,100)
Acquired Intangible Accumulated Amortization and Effect of Currency Translation	(55,470)	(52,526)
Acquired Intangible Net Value	28,213	31,847
Acquired Intangible Weighted Average remaining amortization period (years)	4 years 36 days	4 years 292 days
Purchased Intellectual Property - not yet deployed [Member]
Acquired Intangible Gross Value	15,059	13,809
Acquired Intangible Net Value	15,059	13,809
Research and development in-process [Member]
Acquired Intangible Gross Value	11,070	11,070
Acquired Intangible Impairment	$ (11,070)	$ (11,070)