Segment Information (Details) $ in Thousands	3 Months Ended
Apr. 02, 2016 USD ($) Segment	Apr. 04, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	5
Product Sales	$ 570,528	$ 592,323
Royalty Revenues	78	1,113
Total Revenue	570,606	593,436
Gross Margin	137,309	145,038
Segment Operating Income	40,548	47,558
Restructuring and severance Costs	(6,475)	(1,410)
MOSFETS Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	100,933	106,759
Royalty Revenues	0	11
Total Revenue	100,933	106,770
Gross Margin	12,587	13,758
Diodes Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	135,384	136,511
Royalty Revenues	0	0
Total Revenue	135,384	136,511
Gross Margin	32,662	29,890
Optoelectronic Components Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	62,775	68,625
Royalty Revenues	0	0
Total Revenue	62,775	68,625
Gross Margin	19,181	22,183
Resistors And Inductors Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	183,416	186,392
Royalty Revenues	78	1,102
Total Revenue	183,494	187,494
Gross Margin	55,784	58,849
Capacitors Segment [Member]
Segment Reporting Information [Line Items]
Product Sales	88,020	94,036
Royalty Revenues	0	0
Total Revenue	88,020	94,036
Gross Margin	17,095	20,358
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	(54,078)	(60,220)
Operating Segments [Member] \| MOSFETS Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	2,618	4,527
Operating Segments [Member] \| Diodes Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	26,643	23,485
Operating Segments [Member] \| Optoelectronic Components Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	13,654	17,087
Operating Segments [Member] \| Resistors And Inductors Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	46,883	49,525
Operating Segments [Member] \| Capacitors Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	11,303	14,564
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and severance Costs	$ (6,475)	$ (1,410)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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