Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) Segment	Sep. 29, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			5
Net revenues	$ 628,329	$ 780,972	$ 2,058,728	$ 2,258,797
Gross profit	150,079	236,296	535,839	668,834
Restructuring and severance Costs	(7,255)	0	(7,255)	0
Unallocated Selling, General, and Administrative Expenses	(91,796)	(98,198)	(290,332)	(303,381)
Operating income	51,028	138,098	238,252	365,453
Unallocated Other Income (Expense)	(6,846)	(11,290)	(23,234)	(49,067)
Consolidated Income Before Taxes	44,182	126,808	215,018	316,386
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	317,385	452,051	1,097,365	1,302,127
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	263,983	276,299	815,645	803,128
EMS Companies [Member]
Segment Reporting Information [Line Items]
Net revenues	46,961	52,622	145,718	153,542
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	205,670	283,134	738,043	858,963
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	212,222	224,041	627,588	642,293
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues	34,409	51,935	132,251	144,326
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues	47,923	62,774	143,675	163,862
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues	23,401	48,583	87,936	126,781
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues	31,103	34,899	90,704	110,468
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	41,872	41,881	137,281	117,355
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	31,729	33,725	101,250	94,749
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	231,999	315,701	737,918	904,047
Europe [Member]
Segment Reporting Information [Line Items]
Net revenues	231,677	269,518	765,318	809,501
Americas [Member]
Segment Reporting Information [Line Items]
Net revenues	164,653	195,753	555,492	545,249
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues			2,058,728	2,258,797
Gross profit			535,839	668,834
Operating income	118,733	203,904	439,979	569,822
Operating Segments [Member] | MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues	126,747	144,260	392,930	408,325
Gross profit	30,491	38,991	98,483	109,440
Operating income	21,018	29,502	70,237	80,577
Operating Segments [Member] | Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	123,879	186,492	433,761	535,975
Gross profit	21,138	54,690	93,487	150,298
Operating income	16,420	49,561	78,558	134,592
Operating Segments [Member] | Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	50,702	76,443	171,939	224,110
Gross profit	10,883	27,653	43,131	81,290
Operating income	6,923	23,144	30,655	68,103
Operating Segments [Member] | Resistors & Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	228,577	257,330	731,431	755,323
Gross profit	65,894	88,213	223,178	251,712
Operating income	57,697	80,042	198,127	226,292
Operating Segments [Member] | Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	98,424	116,447	328,667	335,064
Gross profit	21,673	26,749	77,560	76,094
Operating income	16,675	21,655	62,402	60,258
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and severance Costs	(7,255)	0	(7,255)	0
Unallocated Selling, General, and Administrative Expenses	(60,450)	(65,806)	(194,472)	(204,369)
Unallocated Other Income (Expense)	$ (6,846)	$ (11,290)	$ (23,234)	$ (49,067)