Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020 USD ($)	Jun. 29, 2019 USD ($)	Jul. 04, 2020 USD ($) Segment	Jun. 29, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			6
Net revenues	$ 581,717	$ 685,240	$ 1,194,558	$ 1,430,399
Gross profit	130,670	174,601	277,910	385,760
Restructuring and severance Costs	(743)	0	(743)	0
Unallocated Selling, General, and Administrative Expenses	(89,127)	(95,112)	(188,959)	(198,536)
Operating income	40,800	79,489	88,208	187,224
Unallocated Other Income (Expense)	(11,060)	(8,601)	(22,334)	(16,388)
Consolidated Income Before Taxes	29,740	70,888	65,874	170,836
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	349,562	368,420	655,008	779,980
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	190,799	269,026	451,928	551,662
EMS Companies [Member]
Segment Reporting Information [Line Items]
Net revenues	41,356	47,794	87,622	98,757
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	226,877	250,783	441,988	532,373
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	133,834	200,580	335,777	415,366
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues	33,496	44,562	63,188	97,842
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues	55,719	48,244	100,942	95,752
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues	22,571	30,486	43,124	64,535
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues	32,176	29,474	57,370	59,601
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	41,451	47,848	85,386	95,409
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	35,593	33,263	66,783	69,521
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	260,625	246,193	477,709	505,919
Europe [Member]
Segment Reporting Information [Line Items]
Net revenues	179,928	254,742	412,980	533,641
Americas [Member]
Segment Reporting Information [Line Items]
Net revenues	141,164	184,305	303,869	390,839
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues			1,194,558	1,430,399
Gross profit			277,910	385,760
Operating income	100,557	143,177	215,458	321,246
Operating Segments [Member] | MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues	118,944	128,842	235,837	266,183
Gross profit	26,978	31,933	55,130	67,992
Operating income	17,602	22,541	36,260	49,219
Operating Segments [Member] | Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	124,187	142,042	239,530	309,882
Gross profit	24,904	28,857	44,422	72,349
Operating income	19,814	24,010	34,236	62,138
Operating Segments [Member] | Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	49,130	60,675	103,309	121,237
Gross profit	11,728	16,231	26,313	32,248
Operating income	7,948	12,022	18,634	23,732
Operating Segments [Member] | Resistors [Member]
Segment Reporting Information [Line Items]
Net revenues	140,412	165,359	299,620	354,190
Gross profit	32,513	46,877	77,286	109,466
Operating income	27,879	41,667	66,764	98,014
Operating Segments [Member] | Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	65,185	77,024	138,970	148,664
Gross profit	20,252	24,538	43,239	47,818
Operating income	17,713	21,776	38,023	42,416
Operating Segments [Member] | Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	83,859	111,298	177,292	230,243
Gross profit	15,218	26,165	35,573	55,887
Operating income	10,524	21,161	25,594	45,727
Operating Segments [Member] | Corporate Other [Member]
Segment Reporting Information [Line Items]
Net revenues	0	0	0	0
Gross profit	(923)	0	(4,053)	0
Operating income	(923)	0	(4,053)	0
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and severance Costs	(743)	0	(743)	0
Impact of coronavirus outbreak	747	0	430	0
Unallocated Selling, General, and Administrative Expenses	(59,761)	(63,688)	(126,937)	(134,022)
Unallocated Other Income (Expense)	$ (11,060)	$ (8,601)	$ (22,334)	$ (16,388)