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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 04, 2021 | Mar. 29, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | $ 781,606 |  | $ 704,355 |  |
Income (loss) before income taxes | [2],[3] | 223,993 |  | 197,069 |  |
Total assets |  | 3,719,717 | [4] | 2,820,388 | [4] | $ 3,652,346
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 528,063 |  | 484,489 |  |
Income (loss) before income taxes | [2],[3] | 176,368 |  | 153,816 |  |
Total assets | [4] | 1,243,358 |  | 921,108 |  |
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 132,837 |  | 116,076 |  |
Income (loss) before income taxes | [2],[3] | 51,061 |  | 48,407 |  |
Total assets | [4] | 672,596 |  | 643,011 |  |
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 79,951 |  | 60,305 |  |
Income (loss) before income taxes | [2],[3] | (12,967) |  | (15,335) |  |
Total assets | [4] | 179,195 |  | 137,056 |  |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 40,898 |  | 43,485 |  |
Income (loss) before income taxes | [2],[3] | 9,616 |  | 10,220 |  |
Total assets | [4] | 104,367 |  | 106,400 |  |
Corporate And Others [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | (143) |  |  |  |
Income (loss) before income taxes | [2],[3] | (85) |  | (39) |  |
Total assets | [4] | $ 1,520,201 |  | $ 1,012,813 |  |
[1] | Includes $3.1 million and $1.8 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] | 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 charges, legal fees and compensation.
[3] | Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.
[4] | Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

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