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Schedule of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenues | $ 478,010 |  | $ 433,376 |  | $ 1,324,587 |  | $ 1,142,632 |
Income (loss) before income taxes | 100,670 | [1],[2] | 87,552 | [1],[2] | 220,189 | [1],[2] | 166,483 | [1],[2]
Semiconductor Test |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenues | 380,083 |  | 304,131 |  | 1,063,254 |  | 808,068 |
Income (loss) before income taxes | 91,900 | [1],[2] | 68,932 | [1],[2] | 233,770 | [1],[2] | 141,304 | [1],[2]
Wireless Test |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenues | 54,838 |  | 93,132 |  | 144,747 |  | 226,116 |
Income (loss) before income taxes | 2,379 | [1],[2] | 27,575 | [1],[2] | (8,477) | [1],[2] | 41,491 | [1],[2]
System Test |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenues | 43,089 |  | 36,113 |  | 116,586 |  | 108,448 |
Income (loss) before income taxes | 5,779 | [1],[2] | (2,462) | [1],[2] | 5,512 | [1],[2] | (153) | [1],[2]
Corporate And Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Income (loss) before income taxes | $ 612 | [1],[2] | $ (6,493) | [1],[2] | $ (10,616) | [1],[2] | $ (16,159) | [1],[2]
[1] | Pension and postretirement actuarial gains and losses, interest income, and interest expense and other are included in Corporate and Eliminations.
[2] | Included in the income (loss) before income taxes for each of the segments are charges and credits for the three and nine months ended September 28, 2014 and September 29, 2013 that include restructuring and other, and provision for excess and obsolete inventory, as follows:

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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