Intangible Assets (Tables)

12 Months Ended

Jan. 29, 2012

Intangible Assets [Abstract]

Schedule Of Finite-Lived Intangible Assets

(in thousands)		January 29, 2012							January 30, 2011
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core technologies	2-10 years	$	65,900	$	(21,031	)	$	44,869	$	65,900	$	(14,006	)	$	51,894
Customer relationships	8-10 years		12,130		(2,929	)		9,201		12,130		(1,571	)		10,559
Technology licenses (1)	5 years		3,000		(250	)		2,750		—		—			—
Total finite-lived intangbile assets		$	81,030	$	(24,210	)	$	56,820	$	78,030	$	(15,577	)	$	62,453

(1) Technology licenses relate to licensing agreements entered into by the Company. Amortization expense related to technology licenses is reported as "Product development & engineering" in the Consolidated Statements of Income.

Schedule Of Indefinite-Lived Intangible Assets

(in thousands)	January 29, 2012							January 30, 2011
	Gross Carrying Amount		Accumulated Impairment Loss			Net Carrying Amount		Gross Carrying Amount		Accumulated Impairment Loss		Net Carrying Amount
In-process research and development	$	12,370	$	(2,470	)	$	9,900	$	12,370	$	—	$	12,370
Total indefinite-lived intangbile assets	$	12,370	$	(2,470	)	$	9,900	$	12,370	$	—	$	12,370

Impairment Charges Against In-Process Research And Development

In-process research and development impairment	Net Carrying Amount		Impairment
High-speed switching technology for power management applications (1)	$	2,070	$	(2,070	)
Integrated driver for telecommunications applications (2)		400		(400	)
Total	$	2,470	$	(2,470	)

(1) related to the February 2009 Leadis Technology Inc. acquisition.

(2) related to the December 2009 Sierra Monolithics, Inc. acquisition.

Future Amortization Expense

(in thousands)
To be recognized in:	Technology license		Sierra Monolithics		Total
Fiscal year 2013	$	600	$	8,770	$	9,370
Fiscal year 2014		600		9,183		9,783
Fiscal year 2015		600		9,200		9,800
Fiscal year 2016		600		9,200		9,800
Fiscal year 2017		350		9,200		9,550
Thereafter		—		18,417		18,417
Total expected amortization expense	$	2,750	$	63,970	$	66,720