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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues $ 769,210 $ 737,298 $ 2,106,687 $ 2,066,996  
Cost of revenues 314,268 290,252 853,788 842,838  
Engineering and development 112,832 103,302 329,306 294,574  
Selling and marketing 95,086 88,641 271,528 258,344  
General and administrative 42,717 42,538 128,491 122,888  
Other segment items 56,207 53,581 159,890 97,063  
Income (loss) before taxes 148,100 158,984 363,684 451,289  
Total assets 3,963,731 3,769,728 3,963,731 3,769,728 $ 3,708,714
Property additions 46,692 51,841 162,286 140,710  
Depreciation and amortization expense 30,516 30,289 92,207 88,613  
Product Test          
Segment Reporting Information [Line Items]          
Revenues 88,256 80,129 247,498 237,240  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 769,210 737,298 2,106,687 2,066,996  
Cost of revenues 314,268 290,252 853,788 842,838  
Engineering and development 112,832 103,302 329,306 294,574  
Selling and marketing 95,086 88,641 271,528 258,344  
General and administrative 43,015 43,894 126,108 122,490  
Other segment items 54,848 54,836 156,753 153,881  
Income (loss) before taxes 149,161 156,373 369,204 394,869  
Total assets 2,675,055 2,357,481 2,675,055 2,357,481  
Property additions 46,692 51,841 162,286 140,710  
Depreciation and amortization expense 30,513 30,300 92,214 88,587  
Operating Segments | Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 605,867 568,518 1,640,249 1,563,204  
Cost of revenues 248,971 223,828 658,919 647,625  
Engineering and development 85,331 74,007 247,668 210,616  
Selling and marketing 58,983 46,332 163,270 138,432  
General and administrative 27,161 23,208 79,845 65,794  
Other segment items 34,589 33,722 88,150 92,714  
Income (loss) before taxes 150,832 167,421 402,397 408,023  
Total assets 1,564,196 1,360,277 1,564,196 1,360,277  
Property additions 40,341 42,802 143,666 115,041  
Depreciation and amortization expense 22,979 21,278 69,239 62,542  
Operating Segments | Robotics          
Segment Reporting Information [Line Items]          
Revenues 75,087 88,651 218,940 266,552  
Cost of revenues 32,974 36,367 99,421 108,229  
Engineering and development 14,395 17,438 44,319 49,412  
Selling and marketing 23,400 29,408 72,155 82,809  
General and administrative 9,746 15,292 29,490 40,938  
Other segment items 12,139 14,352 46,832 41,263  
Income (loss) before taxes (17,567) (24,206) (73,277) (56,099)  
Total assets 739,066 794,277 739,066 794,277  
Property additions 1,450 6,441 7,654 19,760  
Depreciation and amortization expense 4,615 7,338 16,624 20,896  
Operating Segments | Product Test          
Segment Reporting Information [Line Items]          
Revenues 88,256 80,129 247,498 237,240  
Cost of revenues 32,323 30,057 95,448 86,984  
Engineering and development 13,106 11,857 37,319 34,546  
Selling and marketing 12,703 12,901 36,103 37,103  
General and administrative 6,108 5,394 16,773 15,758  
Other segment items 8,120 6,762 21,771 19,904  
Income (loss) before taxes 15,896 13,158 40,084 42,945  
Total assets 371,793 202,927 371,793 202,927  
Property additions 4,901 2,598 10,966 5,909  
Depreciation and amortization expense 2,919 1,684 6,351 5,149  
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Cost of revenues 0 0 0 0  
Engineering and development 0 0 0 0  
Selling and marketing 0 0 0 0  
General and administrative (298) (1,356) 2,383 398  
Other segment items 1,359 (1,255) 3,137 (56,818)  
Income (loss) before taxes 1,061 2,611 (5,520) 56,420  
Total assets 1,288,676 1,412,247 1,288,676 1,412,247  
Property additions 0 0 0 0  
Depreciation and amortization expense $ 3 $ (11) $ (7) $ 26