Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020 USD ($)	Sep. 28, 2019 USD ($)	Oct. 03, 2020 USD ($) Segment	Sep. 28, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			6
Net revenues	$ 640,160	$ 628,329	$ 1,834,718	$ 2,058,728
Gross profit	151,709	150,079	429,619	535,839
Restructuring and severance Costs	0	(7,255)	(743)	(7,255)
Unallocated Selling, General, and Administrative Expenses	(90,219)	(91,796)	(279,178)	(290,332)
Operating income	61,490	51,028	149,698	238,252
Unallocated Other Income (Expense)	(15,766)	(6,846)	(38,100)	(23,234)
Consolidated Income Before Taxes	45,724	44,182	111,598	215,018
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	325,695	317,385	980,703	1,097,365
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	273,664	263,983	725,592	815,645
EMS Companies [Member]
Segment Reporting Information [Line Items]
Net revenues	40,801	46,961	128,423	145,718
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	209,473	205,670	651,461	738,043
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	216,641	212,222	552,418	627,588
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues	27,845	34,409	91,033	132,251
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues	51,032	47,923	151,974	143,675
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues	33,353	23,401	76,477	87,936
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues	29,112	31,103	86,482	90,704
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	40,582	41,872	125,968	137,281
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	32,122	31,729	98,905	101,250
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	270,451	231,999	748,160	737,918
Europe [Member]
Segment Reporting Information [Line Items]
Net revenues	213,296	231,677	626,276	765,318
Americas [Member]
Segment Reporting Information [Line Items]
Net revenues	156,413	164,653	460,282	555,492
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues			1,834,718	2,058,728
Gross profit			429,619	535,839
Operating income	120,854	118,733	336,312	439,979
Operating Segments [Member] | MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues	133,976	126,747	369,813	392,930
Gross profit	29,649	30,491	84,779	98,483
Operating income	20,148	21,018	56,408	70,237
Operating Segments [Member] | Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	123,744	123,879	363,274	433,761
Gross profit	20,843	21,138	65,265	93,487
Operating income	15,828	16,420	50,064	78,558
Operating Segments [Member] | Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	64,955	50,702	168,264	171,939
Gross profit	21,289	10,883	47,602	43,131
Operating income	17,184	6,923	35,818	30,655
Operating Segments [Member] | Resistors [Member]
Segment Reporting Information [Line Items]
Net revenues	145,362	155,119	444,982	509,309
Gross profit	35,186	42,444	112,472	151,910
Operating income	30,127	36,900	96,891	134,914
Operating Segments [Member] | Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	79,399	73,458	218,369	222,122
Gross profit	26,597	23,450	69,836	71,268
Operating income	24,106	20,797	62,129	63,213
Operating Segments [Member] | Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	92,724	98,424	270,016	328,667
Gross profit	18,387	21,673	53,960	77,560
Operating income	13,703	16,675	39,297	62,402
Operating Segments [Member] | Corporate Other [Member]
Segment Reporting Information [Line Items]
Net revenues	0	0	0	0
Gross profit	(242)	0	(4,295)	0
Operating income	(242)	0	(4,295)	0
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and severance Costs	0	(7,255)	(743)	(7,255)
Impact of coronavirus outbreak	441	0	871	0
Unallocated Selling, General, and Administrative Expenses	(59,805)	(60,450)	(186,742)	(194,472)
Unallocated Other Income (Expense)	$ (15,766)	$ (6,846)	$ (38,100)	$ (23,234)