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Segment Information - Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Dec. 31, 2025
Segment Information [Abstract]          
Net revenues $ 888,575 $ 762,250 $ 1,727,817 $ 1,477,486  
Cost of products sold (excluding depreciation) 632,029 564,479 1,243,576 1,097,181  
Depreciation expense in costs of products sold 49,164 49,088 100,247 96,068  
Total cost of products sold 681,193 613,567 1,343,823 1,193,249  
Gross profit 207,382 148,683 383,994 284,237  
Segment operating expenses 60,832 56,620 118,650 108,670  
Segment operating income (loss) 146,550 92,063 265,344 175,567  
Total depreciation expense 52,845 52,679 107,821 103,197  
Capital expenditures 95,201 64,598 205,862 126,167  
Total assets 5,156,366 4,221,655 5,156,366 4,221,655 $ 4,234,160
MOSFETs [Member]          
Segment Information [Abstract]          
Net revenues 188,926 148,633 362,917 290,746  
Cost of products sold (excluding depreciation) 148,666 125,546 286,720 243,053  
Depreciation expense in costs of products sold 14,121 13,708 27,681 26,708  
Total cost of products sold 162,787 139,254 314,401 269,761  
Gross profit 26,139 9,379 48,516 20,985  
Segment operating expenses 23,587 23,859 44,657 44,204  
Segment operating income (loss) 2,552 (14,480) 3,859 (23,219)  
Total depreciation expense 14,926 14,342 29,270 27,914  
Capital expenditures 77,696 46,002 172,378 92,305  
Total assets 1,298,043 1,123,514 1,298,043 1,123,514  
Diodes [Member]          
Segment Information [Abstract]          
Net revenues 186,965 147,942 350,634 288,905  
Cost of products sold (excluding depreciation) 129,512 106,770 246,471 208,599  
Depreciation expense in costs of products sold 11,750 11,634 23,629 22,746  
Total cost of products sold 141,262 118,404 270,100 231,345  
Gross profit 45,703 29,538 80,534 57,560  
Segment operating expenses 9,008 7,353 17,909 14,178  
Segment operating income (loss) 36,695 22,185 62,625 43,382  
Total depreciation expense 12,101 11,917 24,431 23,400  
Capital expenditures 4,835 3,809 9,096 8,138  
Total assets 712,059 725,548 712,059 725,548  
Optoelectronic Components [Member]          
Segment Information [Abstract]          
Net revenues 70,076 54,119 128,951 105,287  
Cost of products sold (excluding depreciation) 50,262 37,596 94,333 74,254  
Depreciation expense in costs of products sold 3,835 3,965 7,692 7,775  
Total cost of products sold 54,097 41,561 102,025 82,029  
Gross profit 15,979 12,558 26,926 23,258  
Segment operating expenses 6,460 5,743 12,683 11,024  
Segment operating income (loss) 9,519 6,815 14,243 12,234  
Total depreciation expense 3,945 4,081 7,921 7,998  
Capital expenditures 787 4,043 840 4,755  
Total assets 351,750 360,008 351,750 360,008  
Resistors [Member]          
Segment Information [Abstract]          
Net revenues 215,028 194,769 418,771 374,269  
Cost of products sold (excluding depreciation) 156,530 139,330 304,404 267,802  
Depreciation expense in costs of products sold 11,013 11,109 22,086 21,783  
Total cost of products sold 167,543 150,439 326,490 289,585  
Gross profit 47,485 44,330 92,281 84,684  
Segment operating expenses 10,757 9,421 21,400 18,624  
Segment operating income (loss) 36,728 34,909 70,881 66,060  
Total depreciation expense 11,190 11,308 22,454 22,172  
Capital expenditures 4,052 5,644 6,386 8,691  
Total assets 907,412 967,976 907,412 967,976  
Inductors {Member]          
Segment Information [Abstract]          
Net revenues 104,189 95,675 196,414 179,796  
Cost of products sold (excluding depreciation) 67,788 64,594 126,575 126,876  
Depreciation expense in costs of products sold 4,025 4,245 8,105 8,487  
Total cost of products sold 71,813 68,839 134,680 135,363  
Gross profit 32,376 26,836 61,734 44,433  
Segment operating expenses 4,129 3,887 8,189 7,582  
Segment operating income (loss) 28,247 22,949 53,545 36,851  
Total depreciation expense 4,117 4,291 8,231 8,574  
Capital expenditures 1,977 1,021 2,950 1,605  
Total assets 309,329 328,726 309,329 328,726  
Capacitors [Member]          
Segment Information [Abstract]          
Net revenues 153,399 121,112 300,138 238,483  
Cost of products sold (excluding depreciation) 109,279 90,643 215,081 176,597  
Depreciation expense in costs of products sold 4,420 4,427 11,054 8,569  
Total cost of products sold 113,699 95,070 226,135 185,166  
Gross profit 39,700 26,042 74,003 53,317  
Segment operating expenses 6,891 6,357 13,812 13,058  
Segment operating income (loss) 32,809 19,685 60,191 40,259  
Total depreciation expense 4,469 4,472 11,153 8,656  
Capital expenditures 4,791 3,024 12,619 8,999  
Total assets 510,983 462,490 510,983 462,490  
Corporate/Other [Member]          
Segment Information [Abstract]          
Net revenues (30,008)   (30,008)    
Cost of products sold (excluding depreciation) (30,008)   (30,008)    
Depreciation expense in costs of products sold 0   0    
Total cost of products sold (30,008)   (30,008)    
Gross profit 0   0    
Segment operating expenses 0   0    
Segment operating income (loss) 0   0    
Total depreciation expense 2,097 2,268 4,361 4,483  
Capital expenditures 1,063 1,055 1,593 1,674  
Total assets $ 1,066,790 $ 253,393 $ 1,066,790 $ 253,393