v3.26.1
Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]          
Revenues $ 1,328,990 $ 651,797 $ 2,611,484 $ 1,337,477  
Cost of revenues 524,425 274,446 1,018,029 539,520  
Engineering and development 135,933 108,869 255,830 216,474  
Selling and marketing 102,568 88,494 200,700 176,442  
General and administrative 45,050 41,707 87,133 83,093  
Other segment items [1],[2] 77,395 41,722 140,496 106,364  
Income (loss) before taxes [2] 443,619 96,559 909,296 215,584  
Total assets 4,925,617 [3] 3,761,862 [3] 4,925,617 [3] 3,761,862 [3] $ 4,183,599
Property additions 90,706 50,408 155,439 115,594  
Depreciation and amortization expense 33,650 31,389 66,305 61,691  
Product Test          
Segment Reporting Information [Line Items]          
Revenues 107,248 85,053 187,683 159,242  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 1,328,990 651,797 2,611,484 1,337,477  
Cost of revenues 524,425 274,446 1,018,029 539,520  
Engineering and development 135,933 108,869 255,830 216,474  
Selling and marketing 102,568 88,494 200,700 176,442  
General and administrative 45,050 41,707 87,133 83,093  
Other segment items [1],[2] 78,281 45,499 135,264 101,905  
Income (loss) before taxes [2] 442,733 92,782 914,528 220,043  
Total assets [3] 3,561,727 2,454,097 3,561,727 2,454,097  
Property additions 90,706 50,408 155,439 115,594  
Depreciation and amortization expense 33,616 31,389 66,197 61,701  
Operating Segments | Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 1,121,825 491,878 2,232,626 1,034,382  
Cost of revenues 438,344 207,201 852,199 409,948  
Engineering and development 107,393 82,126 200,689 162,337  
Selling and marketing 65,277 52,590 129,108 104,287  
General and administrative 28,980 26,132 55,819 52,684  
Other segment items [1],[2] 54,511 28,066 99,439 53,561  
Income (loss) before taxes [2] 427,320 95,763 895,372 251,565  
Total assets [3] 2,264,787 1,349,429 2,264,787 1,349,429  
Property additions 80,542 43,593 139,035 103,325  
Depreciation and amortization expense 25,273 23,395 49,962 46,260  
Operating Segments | Robotics          
Segment Reporting Information [Line Items]          
Revenues 99,917 74,866 191,175 143,853  
Cost of revenues 46,508 34,155 91,693 66,447  
Engineering and development 13,121 14,069 25,383 29,924  
Selling and marketing 22,689 24,241 43,877 48,755  
General and administrative 9,069 9,879 17,827 19,744  
Other segment items [1],[2] 11,106 11,055 15,935 34,693  
Income (loss) before taxes [2] (2,576) (18,533) (3,540) (55,710)  
Total assets [3] 700,966 745,839 700,966 745,839  
Property additions 6,215 3,528 9,046 6,204  
Depreciation and amortization expense 2,572 6,068 6,899 12,009  
Operating Segments | Product Test          
Segment Reporting Information [Line Items]          
Revenues 107,248 85,053 187,683 159,242  
Cost of revenues 39,573 33,090 74,137 63,125  
Engineering and development 15,419 12,674 29,758 24,213  
Selling and marketing 14,602 11,663 27,715 23,400  
General and administrative 7,001 5,696 13,487 10,665  
Other segment items [1],[2] 12,664 6,378 19,890 13,651  
Income (loss) before taxes [2] 17,989 15,552 22,696 24,188  
Total assets [3] 595,974 358,829 595,974 358,829  
Property additions 3,949 3,287 7,358 6,065  
Depreciation and amortization expense 5,771 1,926 9,336 3,432  
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 [1],[2] (886) (3,777) 5,232 4,459  
Income (loss) before taxes [2] 886 3,777 (5,232) 4,459  
Total assets [3] 1,363,890 1,307,765 1,363,890 1,307,765  
Property additions 0 0  
Depreciation and amortization expense $ 34 $ (0) $ (108) $ (10)  
[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.