Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			5
Net revenues	$ 685,240	$ 761,030	$ 1,430,399	$ 1,477,825
Gross profit	174,601	227,238	385,760	432,538
Unallocated Selling, General, and Administrative Expenses	(95,112)	(103,945)	(198,536)	(205,183)
Operating income	79,489	123,293	187,224	227,355
Unallocated Other Income (Expense)	(8,601)	(25,734)	(16,388)	(37,777)
Consolidated Income Before Taxes	70,888	97,559	170,836	189,578
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	368,420	446,016	779,980	850,076
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	269,026	262,779	551,662	526,829
EMS Companies [Member]
Segment Reporting Information [Line Items]
Net revenues	47,794	52,235	98,757	100,920
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	250,783	295,617	532,373	575,829
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	200,580	209,858	415,366	418,252
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues	44,562	46,467	97,842	92,391
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues	48,244	53,657	95,752	101,088
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues	30,486	40,939	64,535	78,198
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues	29,474	41,326	59,601	75,569
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	47,848	40,260	95,409	75,474
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	33,263	32,906	69,521	61,024
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	246,193	302,868	505,919	588,346
Europe [Member]
Segment Reporting Information [Line Items]
Net revenues	254,742	272,601	533,641	539,983
Americas [Member]
Segment Reporting Information [Line Items]
Net revenues	184,305	185,561	390,839	349,496
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues			1,430,399	1,477,825
Gross profit			385,760	432,538
Operating income	143,177	193,740	321,246	365,918
Operating Segments [Member] | MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues	128,842	136,559	266,183	264,065
Gross profit	31,933	38,427	67,992	70,449
Operating income	22,541	28,517	49,219	51,075
Operating Segments [Member] | Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	142,042	182,466	309,882	349,483
Gross profit	28,857	52,408	72,349	95,608
Operating income	24,010	47,100	62,138	85,031
Operating Segments [Member] | Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	60,675	75,709	121,237	147,667
Gross profit	16,231	26,404	32,248	53,637
Operating income	12,022	22,165	23,732	44,959
Operating Segments [Member] | Resistors & Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	242,383	253,947	502,854	497,993
Gross profit	71,415	84,969	157,284	163,499
Operating income	63,443	76,248	140,430	146,250
Operating Segments [Member] | Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	111,298	112,349	230,243	218,617
Gross profit	26,165	25,030	55,887	49,345
Operating income	21,161	19,710	45,727	38,603
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Selling, General, and Administrative Expenses	(63,688)	(70,447)	(134,022)	(138,563)
Unallocated Other Income (Expense)	$ (8,601)	$ (25,734)	$ (16,388)	$ (37,777)