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Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 12, 2016 | Mar. 31, 2024 | Apr. 02, 2023 | Dec. 31, 2023 | Oct. 05, 2022 | May 01, 2020
Debt Instrument |  |  |  |  |  |
Repurchase of common stock |  | $ 22,117 | $ 93,308 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 750,000 | $ 400,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases |  | $ 200,000 |  |  |  |
Line of Credit Facility, Interest Rate Description |  | The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio. |  |  |  |
Term of revolving credit facility |  |  |  |  |  | 3 years
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA |  | 15.00% |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 730,260 |  | $ 706,514 |  |
Warrant [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Warrant expired |  | 0.8 |  |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  | 65 |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Aggregate principal amount | $ 460,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.25% |  |  |  |  |
Debt instrument, net proceeds after issuance costs | $ 450,800 |  |  |  |  |
Payment for net cost of convertible note hedges net of warrant proceeds | 33,000 |  |  |  |  |
Repurchase of common stock | $ 50,100 |  |  |  |  |
Repurchase of stock, shares | 2.0 |  |  |  |  |
Debt instrument, frequency of periodic payment | payable semiannually in arrears on June 15 and December 15 of each year |  |  |  |  |
1.25% Convertible Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Senior notes maturity date | Dec. 15, 2023 |  |  |  |  |
Shares that would be issued upon conversion |  | 13.8 |  |  |  |
Strike price per share of warrant |  | $ 39.37 |  |  |  |
Maximum | 1.25% Convertible Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Warrant transactions expiry date |  | Jul. 10, 2024 |  |  |  |
Minimum | 1.25% Convertible Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Warrant transactions expiry date |  | Mar. 18, 2024 |  |  |  |
Revolving Credit Facility | Maximum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Commitment fee percentage of unused portion of credit facility |  | 0.25% |  |  |  |
Revolving Credit Facility | Minimum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Commitment fee percentage of unused portion of credit facility |  | 0.15% |  |  |  |
Revolving Credit Facility | Base Rate | Maximum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% |  |  |  |
Revolving Credit Facility | Base Rate | Minimum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.85% |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.10% |  |  |  |

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