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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 05, 2015 | Jun. 29, 2014 | Mar. 30, 2014 | Jul. 05, 2015 | Jun. 29, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring and other |  | $ (385) | $ 572 |  | $ (385) | $ 572
Contingent consideration adjustment |  |  |  |  | (1,600) |
Gain from the sale of an equity investment |  |  |  |  | (5,406) |
Stock based compensation expense |  |  |  | $ 6,600 |  |
ZTEC Instruments, Inc. |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Contingent consideration adjustment |  | 1,600 |  |  | 1,600 |
Universal Robots |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Acquisition related costs |  |  |  |  | 1,000 |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory charge |  | 330 | 879 |  | 1,176 | 3,972
Restructuring and other |  |  | 426 |  |  | 426
Total |  | 330 | 1,305 |  | 1,176 | 4,398
System Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory charge |  | 7,702 | 440 |  | 7,765 | 1,181
Restructuring and other |  |  | 146 |  |  | 146
Total |  | 7,702 | 586 |  | 7,765 | 1,327
Industrial Automation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory step-up | [1] | 595 |  |  | 595 |
Total |  | 595 |  |  | 595 |
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory charge |  | 6,409 | 3,713 |  | 6,940 | 9,918
Restructuring and other |  | 305 |  |  | 305 |
Total |  | 6,714 | $ 3,713 |  | 7,245 | 9,918
Corporate And Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total |  | (1,264) |  |  | (6,046) | 6,598
Corporate And Eliminations | Other (income) expense, net |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain from the sale of an equity investment |  | (624) |  |  | (5,406) |
Corporate And Eliminations | Selling, General and Administrative Expenses |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Stock based compensation expense | [2] |  |  |  |  | $ 6,598
Corporate And Eliminations | ZTEC Instruments, Inc. | Restructuring and other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Contingent consideration adjustment |  | (1,600) |  |  | (1,600) |
Corporate And Eliminations | Universal Robots | Restructuring and other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Acquisition related costs |  | $ 960 |  |  | $ 960 |
[1] | Included in the cost of revenues for the three and six months ended July 5, 2015 is the cost for purchase accounting inventory step-up.
[2] | Expense related to the January 2014 retirement of Teradyne's former chief executive officer; see Note J: "Stock-Based Compensation".

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