v3.25.2
Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2025
Jun. 30, 2024
Jun. 29, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues $ 651,797 $ 729,879 $ 1,337,477 $ 1,329,698  
Cost of revenues 274,446 296,962 539,520 552,586  
Engineering and development 108,869 98,037 216,474 191,272  
Selling and marketing 88,494 87,714 176,442 169,703  
General and administrative 42,626 39,183 85,774 80,350  
Other segment items 40,803 (11,420) 103,683 43,482  
Income (loss) before taxes 96,559 219,403 215,584 292,305  
Total assets 3,761,862 3,631,706 3,761,862 3,631,706 $ 3,708,714
Property additions 50,408 44,846 115,594 88,869  
Depreciation and amortization expense 31,389 30,204 61,691 58,324  
Product Test          
Segment Reporting Information [Line Items]          
Revenues 85,053 79,716 159,242 157,113  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 651,797 729,879 1,337,477 1,329,698  
Cost of revenues 274,446 296,962 539,520 552,586  
Engineering and development 108,869 98,037 216,474 191,272  
Selling and marketing 88,494 87,714 176,442 169,703  
General and administrative 41,707 39,201 83,093 78,596  
Other segment items 45,499 52,403 101,905 99,044  
Income (loss) before taxes 92,782 155,562 220,043 238,497  
Total assets 2,454,097 2,296,483 2,454,097 2,296,483  
Property additions 50,408 44,846 115,594 88,869  
Depreciation and amortization expense 31,389 30,236 61,701 58,287  
Operating Segments | Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 491,878 559,916 1,034,382 994,686  
Cost of revenues 207,201 230,904 409,948 423,797  
Engineering and development 82,126 70,961 162,337 136,609  
Selling and marketing 52,590 47,113 104,287 92,100  
General and administrative 26,132 21,524 52,684 42,586  
Other segment items 28,066 32,207 53,561 58,992  
Income (loss) before taxes 95,763 157,207 251,565 240,602  
Total assets 1,349,429 1,353,880 1,349,429 1,353,880  
Property additions 43,593 35,685 103,325 72,239  
Depreciation and amortization expense 23,395 21,394 46,260 41,264  
Operating Segments | Robotics          
Segment Reporting Information [Line Items]          
Revenues 74,866 90,247 143,853 177,901  
Cost of revenues 34,155 37,409 66,447 71,862  
Engineering and development 14,069 16,187 29,924 31,974  
Selling and marketing 24,241 28,580 48,755 53,401  
General and administrative 9,879 12,429 19,744 25,646  
Other segment items 11,055 13,558 34,693 26,910  
Income (loss) before taxes (18,533) (17,916) (55,710) (31,892)  
Total assets 745,839 731,264 745,839 731,264  
Property additions 3,528 7,607 6,204 13,319  
Depreciation and amortization expense 6,068 7,127 12,009 13,558  
Operating Segments | Product Test          
Segment Reporting Information [Line Items]          
Revenues 85,053 79,716 159,242 157,111  
Cost of revenues 33,090 28,649 63,125 56,927  
Engineering and development 12,674 10,889 24,213 22,689  
Selling and marketing 11,663 12,021 23,400 24,202  
General and administrative 5,696 5,248 10,665 10,364  
Other segment items 6,378 6,638 13,651 13,142  
Income (loss) before taxes 15,552 16,271 24,188 29,787  
Total assets 358,829 211,339 358,829 211,339  
Property additions 3,287 1,554 6,065 3,311  
Depreciation and amortization expense 1,926 1,715 3,432 3,465  
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 919 (18) 2,681 1,754  
Other segment items (4,696) (63,823) 1,778 (55,562)  
Income (loss) before taxes 3,777 63,841 (4,459) 53,808  
Total assets 1,307,765 1,335,223 1,307,765 1,335,223  
Property additions 0 0 0 0  
Depreciation and amortization expense $ 0 $ (32) $ (10) $ 37