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Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2021
Jun. 28, 2020
Jul. 04, 2021
Jun. 28, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Revenues $ 1,085,728 [1] $ 838,661 [1] $ 1,867,334 [2] $ 1,543,016 [2]  
Income (loss) before income taxes [3],[4] 384,026 217,291 608,019 414,359  
Total assets 4,000,922 [5] 3,249,189 [5] 4,000,922 [5] 3,249,189 [5] $ 3,652,346
Semiconductor Test          
Segment Reporting Information [Line Items]          
Revenues 833,976 659,147 1,362,039 1,143,636  
Income (loss) before income taxes [3],[4] 337,302 228,787 513,670 382,603  
Total assets [5] 1,518,941 1,192,355 1,518,941 1,192,355  
System Test          
Segment Reporting Information [Line Items]          
Revenues 104,819 [1] 71,806 [1] 237,656 [2] 187,882 [2]  
Income (loss) before income taxes [3],[4] 33,954 19,193 85,015 67,600  
Total assets [5] 146,296 126,164 146,296 126,164  
Industrial Automation          
Segment Reporting Information [Line Items]          
Revenues 92,186 58,776 172,137 119,081  
Income (loss) before income taxes [3],[4] (9,837) (11,403) (22,804) (26,738)  
Total assets [5] 687,022 662,103 687,022 662,103  
Wireless Test          
Segment Reporting Information [Line Items]          
Revenues 54,893 [1] 49,185 [1] 95,791 [2] 92,670 [2]  
Income (loss) before income taxes [3],[4] 21,472 14,482 31,088 24,702  
Total assets [5] 117,702 108,066 117,702 108,066  
Corporate And Others [Member]          
Segment Reporting Information [Line Items]          
Revenues (146) (253) (289) (253)  
Income (loss) before income taxes [3],[4] 1,135 (33,768) 1,050 (33,808)  
Total assets [5] $ 1,530,961 $ 1,160,501 $ 1,530,961 $ 1,160,501  
[1] Includes $4.2 million and $2.5 million in 2021 and 2020, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
[2] Includes $7.3 million and $4.3 million in 2021 and 2020, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”
[3] Included in Corporate and Other are: contingent consideration adjustments, loss on convertible debt conversions, interest income, interest expense, net foreign exchange gains (losses), pension, intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.
[4] Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions 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.