Geographic Information and Concentration of Risk (Tables)

12 Months Ended

Jan. 27, 2013

Risks and Uncertainties [Abstract]

Schedule of net sales by product line

The table below provides net sales activity by product line on a comparative basis for all periods. As a result of the acquisition of Gennum and Cycleo (see Note 3) in March 2012, the Company formed a separate Gennum product line while Cycleo is part of the Wireless and Sensing product line.

	Fiscal Year Ended
(in thousands, except percentages)	January 27, 2013				January 29, 2012				January 30, 2011
Advanced Communications	$	133,533	23	%	$	139,695	29	%	$	112,019	25	%
Wireless and Sensing	50,444		9	%	57,124		12	%	59,107		13	%
Power Management and High Reliability	66,427		12	%	74,056		15	%	87,693		19	%
Protection	198,866		34	%	209,726		44	%	195,683		43	%
Gennum	129,557		22	%	—		—	%	—		—	%
Total net sales	$	578,827	100	%	$	480,601	100	%	$	454,502	100	%

Schedule of net sales by geographic region

Net sales activity by geographic region is as follows:

	Fiscal Year Ended
(in thousands, except percentages)	January 27, 2013				January 29, 2012				January 30, 2011
North America	$	98,401	17	%	$	114,552	24	%	$	112,404	25	%
Asia-Pacific	405,179		70	%	298,477		62	%	272,079		60	%
Europe	75,247		13	%	67,572		14	%	70,019		15	%
Total net sales	$	578,827	100	%	$	480,601	100	%	$	454,502	100	%

Schedule of sales activity to countries representing greater than 10% of total sales

The table below summarizes sales activity to countries that represented greater than 10% of total net sales for at least one of the periods indicated:

	Fiscal Year Ended
(percentage of total sales)	January 27, 2013		January 29, 2012		January 30, 2011
United States	17	%	20	%	23	%
China (including Hong Kong)	35	%	38	%	34	%
Japan	10	%	8	%	7	%
South Korea	7	%	8	%	10	%
Total net sales	69	%	74	%	74	%

Schedule of income (loss) from continuing operations before income taxes

The Company’s regional income (loss) from continuing operations before income taxes is as follows:

	Fiscal Year Ended
(in thousands)	January 27, 2013			January 29, 2012			January 30, 2011
Domestic	$	(19,867	)	$	(3,070	)	$	(12,540	)
Foreign	20,116			97,249			91,872
Total	$	249		$	94,179		$	79,332

Schedule of long-lived assets

Long-lived assets which consist of property, plant and equipment, net of accumulated depreciation are summarized as follows:

(in thousands)	January 27, 2013		January 29, 2012
Located within the United States	$	53,858	$	47,612
Located outside the United States	47,979		22,101
	$	101,837	$	69,713

Schedule of concentration risk of net sales

Each of the following significant customers accounted for at least 10% of net sales for at least one of the periods indicated:

	Fiscal Year Ended
(percentage of net sales)	January 27, 2013		January 29, 2012		January 30, 2011
Samsung Electronics (and affiliates)	12	%	13	%	12	%
Huawei Technologies (and affiliates)	10	%	7	%	8	%
Frontek Technology Corp	6	%	10	%	11	%

Schedule of concentration risk of accounts receivable

The following table shows the list of customers that have an outstanding receivable balance that represents at least 10% of total net receivables for at least one of the periods indicated:

	Balance as of
(percentage of net accounts receivable)	January 27, 2013		January 29, 2012
Huawei Technologies (and affiliates)	14	%	11	%
Samsung Electronics (and affiliates)	12	%	14	%
Frontek Technology Corp	4	%	10	%
Dragon Technology	3	%	11	%