Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Net revenues	$ 790,640	$ 735,353	$ 2,268,126	$ 2,222,871
Cost of products sold (excluding depreciation)	586,573	537,403	1,683,754	1,602,068
Depreciation expense in cost of products sold	50,208	47,067	146,276	136,643
Total cost of products sold	636,781	584,470	1,830,030	1,738,711
Gross profit	153,859	150,883	438,096	484,160
Segment operating expenses	56,056	51,376	164,726	147,906
Segment operating income (loss)	97,803	99,507	273,370	336,254
Total depreciation expense	54,008	50,504	157,205	146,645
Capital expenditures	52,324	59,527	178,491	175,175
Total Assets	4,195,976	4,220,358	4,195,976	4,220,358	$ 4,110,696
Restructuring and severance costs	0	(40,614)	0	(40,614)	$ (40,614)
Unallocated Selling, General, and Administrative Expenses	(134,712)	(128,545)	(396,016)	(381,234)
Operating income (loss)	19,147	(18,276)	42,080	62,312
Unallocated Other Income (Expense)	(7,260)	(5,793)	(22,144)	(5,848)
Consolidated Income (Loss) Before Taxes	11,887	(24,069)	19,936	56,464
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	445,597	406,468	1,264,249	1,200,456
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	294,146	278,801	849,747	871,739
EMS Companies [Member]
Segment Reporting Information [Line Items]
Net revenues	50,897	50,084	154,130	150,676
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	271,880	243,610	783,834	753,872
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	286,606	279,597	811,141	834,998
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	79,139	81,264	235,944	245,189
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	38,794	37,010	113,225	110,855
Other [Member]
Segment Reporting Information [Line Items]
Net revenues	114,221	93,872	323,982	277,957
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	340,255	289,577	942,313	857,073
Europe [Member]
Segment Reporting Information [Line Items]
Net revenues	258,763	256,296	770,583	793,183
Americas [Member]
Segment Reporting Information [Line Items]
Net revenues	191,622	189,480	555,230	572,615
MOSFETs [Member]
Segment Reporting Information [Line Items]
Net revenues	167,133	147,134	457,879	455,360
Cost of products sold (excluding depreciation)	136,338	117,080	379,391	354,781
Depreciation expense in cost of products sold	13,985	12,876	40,693	36,359
Total cost of products sold	150,323	129,956	420,084	391,140
Gross profit	16,810	17,178	37,795	64,220
Segment operating expenses	23,207	21,443	67,411	58,604
Segment operating income (loss)	(6,397)	(4,265)	(29,616)	5,616
Total depreciation expense	14,691	13,446	42,605	37,757
Capital expenditures	32,225	33,375	124,530	99,508
Total Assets	1,145,176	1,082,808	1,145,176	1,082,808
Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	149,628	145,183	438,533	440,578
Cost of products sold (excluding depreciation)	107,150	104,400	315,749	313,868
Depreciation expense in cost of products sold	12,088	11,538	34,834	34,096
Total cost of products sold	119,238	115,938	350,583	347,964
Gross profit	30,390	29,245	87,950	92,614
Segment operating expenses	7,616	6,497	21,794	19,441
Segment operating income (loss)	22,774	22,748	66,156	73,173
Total depreciation expense	12,377	11,811	35,777	34,988
Capital expenditures	7,796	7,989	15,934	25,232
Total Assets	715,379	745,232	715,379	745,232
Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	55,590	63,227	160,877	165,436
Cost of products sold (excluding depreciation)	38,855	47,752	113,109	121,116
Depreciation expense in cost of products sold	4,023	3,927	11,798	11,566
Total cost of products sold	42,878	51,679	124,907	132,682
Gross profit	12,712	11,548	35,970	32,754
Segment operating expenses	5,518	5,395	16,542	16,415
Segment operating income (loss)	7,194	6,153	19,428	16,339
Total depreciation expense	4,142	4,042	12,140	11,865
Capital expenditures	2,292	1,566	7,047	3,991
Total Assets	357,933	354,035	357,933	354,035
Resistors [Member]
Segment Reporting Information [Line Items]
Net revenues	195,707	180,889	569,976	548,583
Cost of products sold (excluding depreciation)	145,064	129,691	412,866	389,481
Depreciation expense in cost of products sold	11,260	10,547	33,043	30,798
Total cost of products sold	156,324	140,238	445,909	420,279
Gross profit	39,383	40,651	124,067	128,304
Segment operating expenses	9,506	8,346	28,130	24,967
Segment operating income (loss)	29,877	32,305	95,937	103,337
Total depreciation expense	11,463	10,742	33,635	31,327
Capital expenditures	3,876	8,021	12,567	26,609
Total Assets	946,334	1,007,259	946,334	1,007,259
Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	91,990	90,253	271,786	272,965
Cost of products sold (excluding depreciation)	59,469	58,516	186,345	177,883
Depreciation expense in cost of products sold	4,240	4,371	12,727	12,645
Total cost of products sold	63,709	62,887	199,072	190,528
Gross profit	28,281	27,366	72,714	82,437
Segment operating expenses	3,802	3,717	11,384	11,060
Segment operating income (loss)	24,479	23,649	61,330	71,377
Total depreciation expense	4,294	4,388	12,868	12,705
Capital expenditures	738	2,314	2,343	5,777
Total Assets	319,553	345,603	319,553	345,603
Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	130,592	108,667	369,075	339,949
Cost of products sold (excluding depreciation)	99,697	79,964	276,294	244,939
Depreciation expense in cost of products sold	4,612	3,808	13,181	11,179
Total cost of products sold	104,309	83,772	289,475	256,118
Gross profit	26,283	24,895	79,600	83,831
Segment operating expenses	6,407	5,978	19,465	17,419
Segment operating income (loss)	19,876	18,917	60,135	66,412
Total depreciation expense	4,656	3,852	13,312	11,334
Capital expenditures	4,754	4,923	13,753	10,627
Total Assets	457,475	442,753	457,475	442,753
Corporate Other [Member]
Segment Reporting Information [Line Items]
Net revenues	0	0	0	0
Cost of products sold (excluding depreciation)	0	0	0	0
Depreciation expense in cost of products sold	0	0	0	0
Total cost of products sold	0	0	0	0
Gross profit	0	0	0	0
Segment operating expenses	0	0	0	0
Segment operating income (loss)	0	0	0	0
Total depreciation expense	2,385	2,223	6,868	6,669
Capital expenditures	643	1,339	2,317	3,431
Total Assets	254,126	242,668	254,126	242,668
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	97,803	99,507	273,370	336,254
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Restructuring and severance costs	0	(40,614)	0	(40,614)
Unallocated Selling, General, and Administrative Expenses	(78,656)	(77,169)	(231,290)	(233,328)
Unallocated Other Income (Expense)	$ (7,260)	$ (5,793)	$ (22,144)	$ (5,848)