v3.26.3
Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2026
Sep. 28, 2025
Sep. 27, 2026
Sep. 28, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]          
Revenues $ 1,305,950 $ 769,210 $ 3,917,434 $ 2,106,687  
Cost of revenues 525,298 314,268 1,543,327 853,788  
Engineering and development 144,220 112,832 400,050 329,306  
Selling and marketing 107,106 95,086 307,806 271,528  
General and administrative 48,175 43,015 135,307 126,108  
Other segment items [1],[2] 76,860 55,909 217,356 162,273  
Income (loss) before taxes [2] 404,291 148,100 1,313,588 363,684  
Total assets 5,449,193 [3] 3,963,731 [3] 5,449,193 [3] 3,963,731 [3] $ 4,183,599
Property additions 86,324 46,692 241,762 162,286  
Depreciation and amortization expense 36,876 30,516 103,181 92,207  
Product Test          
Segment Reporting Information [Line Items]          
Revenues 138,111 88,256 325,794 247,498  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 1,305,950 769,210 3,917,434 2,106,687  
Cost of revenues 525,298 314,268 1,543,327 853,788  
Engineering and development 144,220 112,832 400,050 329,306  
Selling and marketing 107,106 95,086 307,806 271,528  
General and administrative 48,175 43,015 135,307 126,108  
Other segment items 72,469 54,848 [1],[2] 207,733 [1],[2] 156,753 [1],[2]  
Income (loss) before taxes [2] 408,682 149,161 1,323,211 369,204  
Total assets [3] 3,944,645 2,675,055 3,944,645 2,675,055  
Property additions 77,567 46,692 233,005 162,286  
Depreciation and amortization expense 36,624 30,513 102,821 92,214  
Operating Segments | Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 1,072,011 605,867 3,304,637 1,640,249  
Cost of revenues 442,524 248,971 1,294,723 658,919  
Engineering and development 114,142 85,331 314,831 247,668  
Selling and marketing 69,014 58,983 198,122 163,270  
General and administrative 31,600 27,161 87,418 79,845  
Other segment items 47,816 34,589 [1],[2] 147,255 [1],[2] 88,150 [1],[2]  
Income (loss) before taxes [2] 366,915 150,832 1,262,288 402,397  
Total assets [3] 2,577,795 1,564,196 2,577,795 1,564,196  
Property additions 68,970 40,341 208,019 143,666  
Depreciation and amortization expense 26,238 22,979 76,200 69,239  
Operating Segments | Robotics          
Segment Reporting Information [Line Items]          
Revenues 95,828 75,087 287,003 218,940  
Cost of revenues 39,074 32,974 130,767 99,421  
Engineering and development 13,748 14,395 39,131 44,319  
Selling and marketing 22,633 23,400 66,510 72,155  
General and administrative 9,099 9,746 26,926 29,490  
Other segment items 10,929 12,139 [1],[2] 26,864 [1],[2] 46,832 [1],[2]  
Income (loss) before taxes [2] 345 (17,567) (3,195) (73,277)  
Total assets [3] 723,274 739,066 723,274 739,066  
Property additions 4,576 1,450 13,620 7,654  
Depreciation and amortization expense 4,528 4,615 11,427 16,624  
Operating Segments | Product Test          
Segment Reporting Information [Line Items]          
Revenues 138,111 88,256 325,794 247,498  
Cost of revenues 43,700 32,323 117,837 95,448  
Engineering and development 16,330 13,106 46,088 37,319  
Selling and marketing 15,459 12,703 43,174 36,103  
General and administrative 7,476 6,108 20,963 16,773  
Other segment items 13,724 8,120 [1],[2] 33,614 [1],[2] 21,771 [1],[2]  
Income (loss) before taxes [2] 41,422 15,896 64,118 40,084  
Total assets [3] 643,576 371,793 643,576 371,793  
Property additions 4,021 4,901 11,366 10,966  
Depreciation and amortization expense 5,858 2,919 15,194 6,351  
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 0 (0) (0) (0)  
Other segment items 4,391 1,061 [1],[2] 9,623 [1],[2] 5,520 [1],[2]  
Income (loss) before taxes [2] (4,391) (1,061) (9,623) (5,520)  
Total assets [3] 1,504,548 1,288,676 1,504,548 1,288,676  
Property additions 8,757 0 8,757 0  
Depreciation and amortization expense $ 252 $ 3 $ 360 $ (7)  
[1] For each reportable segment, the other segment items category includes equity and variable compensation, acquired intangible assets amortization, inventory step-up, and restructuring and other charges.
[2] Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension and postretirement plan actuarial gains (losses), acquisition and divestiture related expenses, ERP implementation related costs, and an expense for the modification of outstanding equity awards.
[3] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.