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Product Warranty (Tables) | 9 Months Ended
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Sep. 29, 2019
Other Accrued Liabilities | The warranty balance below is included in other accrued liabilities on the balance sheet.
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, |  |  | September 30, |  |  | September 29, |  |  | September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Balance at beginning of period |  | $ | 8,133 |  |  | $ | 7,136 |  |  | $ | 7,909 |  |  | $ | 8,200 |
Acquisition |  |  | — |  |  |  | — |  |  |  | 14 |  |  |  | 41 |
Accruals for warranties issued during the period |  |  | 3,508 |  |  |  | 2,760 |  |  |  | 10,008 |  |  |  | 9,171 |
Accruals related to pre-existing warranties |  |  | 1,132 |  |  |  | 282 |  |  |  | 3,156 |  |  |  | 109 |
Settlements made during the period |  |  | (4,265 | ) |  |  | (2,675 | ) |  |  | (12,579 | ) |  |  | (10,018 | )
Balance at end of period |  | $ | 8,508 |  |  | $ | 7,503 |  |  | $ | 8,508 |  |  | $ | 7,503 |
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances | The balance below is included in short and long-term deferred revenue and customer advances on the balance sheet.
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2019 |  |  | September 30, 2018 |  |  | September 29, 2019 |  |  | September 30, 2018 |
|  | (in thousands) |
Balance at beginning of period |  | $ | 28,716 |  |  | $ | 25,971 |  |  | $ | 27,422 |  |  | $ | 24,438 |
Deferral of new extended warranty revenue |  |  | 5,666 |  |  |  | 7,232 |  |  |  | 16,962 |  |  |  | 19,072 |
Recognition of extended warranty deferred revenue |  |  | (4,445 | ) |  |  | (5,586 | ) |  |  | (14,447 | ) |  |  | (15,893 | )
Balance at end of period |  | $ | 29,937 |  |  | $ | 27,617 |  |  | $ | 29,937 |  |  | $ | 27,617 |

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- Definition Schedule of extended product warranty liability. + References No definition available. + Details
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Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration