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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Jun. 30, 2024
Jul. 02, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Revenues $ 729,879 [1] $ 684,437 [1] $ 1,329,698 [2] $ 1,301,966 [2]  
Income (loss) before income taxes [3],[4] 219,403 144,402 292,305 241,486  
Total assets 3,631,706 [5] 3,394,896 [5] 3,631,706 [5] 3,394,896 [5] $ 3,486,824
System Test          
Segment Reporting Information [Line Items]          
Revenues 60,801 [1] 94,272 [1] 136,123 [2] 168,903 [2]  
Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 36,267 [1] 43,823 [1] 60,856 [2] 82,498 [2]  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 729,879 684,437 1,329,698 1,301,966  
Income (loss) before income taxes [3],[4] 155,562 143,258 238,497 245,580  
Total assets [5] 2,296,483 2,381,112 2,296,483 2,381,112  
Operating Segments | Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 542,564 474,708 954,817 889,717  
Income (loss) before income taxes [3],[4] 158,284 129,040 237,698 225,225  
Total assets [5] 1,306,390 1,416,109 1,306,390 1,416,109  
Operating Segments | System Test          
Segment Reporting Information [Line Items]          
Revenues 60,801 94,272 136,123 168,903  
Income (loss) before income taxes [3],[4] 5,224 28,599 23,615 43,874  
Total assets [5] 175,567 191,002 175,567 191,002  
Operating Segments | Robotics          
Segment Reporting Information [Line Items]          
Revenues 90,247 71,634 177,901 160,848  
Income (loss) before income taxes [3],[4] (17,916) (26,401) (31,892) (44,891)  
Total assets [5] 731,264 685,132 731,264 685,132  
Operating Segments | Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 36,267 43,823 60,856 82,498  
Income (loss) before income taxes [3],[4] 9,970 12,020 9,076 21,372  
Total assets [5] 83,262 88,869 83,262 88,869  
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Income (loss) before income taxes [3],[4] 63,841 1,144 53,808 (4,094)  
Total assets [5] $ 1,335,223 $ 1,013,784 $ 1,335,223 $ 1,013,784  
[1] Includes $0.8 million and $1.3 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[2] Includes $1.7 million and $2.5 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[3] Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.
[4] Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges.
[5] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.