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v3.23.3

Debt - Additional Information (Detail) $ / shares in Units, shares in Millions |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 12, 2016 USD ($) Days $ / shares shares | Oct. 01, 2023 USD ($) $ / shares shares | Oct. 02, 2022 USD ($) | Nov. 03, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 05, 2022 USD ($) | Jan. 01, 2022 USD ($) | May 01, 2020 USD ($)
Debt Instrument |  |  |  |  |  |  |  |
Repurchase of common stock |  | $ 346,492,000 | $ 750,000,000 |  |  |  |  |
Trading days measurement period | Days | 5 |  |  |  |  |  |  |
Debt issuance costs, amortization period |  | 7 years |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 750,000,000 |  | $ 400,000,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases |  | $ 200,000,000 |  |  |  |  |  |
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
Expected principal interest payments in next 3 months |  | $ 100,000 |  |  |  |  |  |
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA |  | 15.00% |  |  |  |  |  |
Current debt, Conversion |  | $ 23,529,000 |  |  | $ 50,115,000 |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 653,937,000 |  |  | $ 725,729,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  | $ 436,500,000 |  |  |  |
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 | $ 460,000,000 | $ 460,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.25% |  |  |  |  |  |  |
Debt instrument, net proceeds after issuance costs | $ 450,800,000 |  |  |  |  |  |  |
Payment for net cost of convertible note hedges net of warrant proceeds | 33,000,000 | $ 33,000,000 |  |  |  |  |  |
Repurchase of common stock | $ 50,100,000 |  |  |  |  |  |  |
Repurchase of stock, shares | shares | 2.0 |  |  |  |  |  |  |
Senior notes maturity date | Dec. 15, 2023 |  |  |  |  |  |  |
Debt instrument, frequency of periodic payment | payable semiannually in arrears on June 15 and December 15 of each year |  |  |  |  |  |  |
Debt instrument, date of first required payment | Mar. 31, 2017 |  |  |  |  |  |  |
Debt instrument, conversion option expiration date | Sep. 15, 2023 |  |  |  |  |  |  |
Consecutive trading days measurement period | Days | 5 |  |  |  |  |  |  |
Debt instrument conversion price | $ / shares | $ 31.41 | $ 31.41 |  |  |  |  |  |
Shares that would be issued upon conversion | shares |  | 14.6 |  |  |  |  |  |
Strike price per share of warrant | $ / shares |  | $ 39.42 |  |  |  |  |  |
Debt instrument, convertible, carrying amount of equity component |  | $ 100,800,000 |  |  |  |  |  |
Value of notes converted |  | 75,300,000 |  |  |  |  |  |
Current debt, Conversion |  | $ 0 |  |  |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option one |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,000,000 |  |  |  |  |  |  |
Trading days measurement period | Days | 20 |  |  |  |  |  |  |
Consecutive trading days measurement period | Days | 30 |  |  |  |  |  |  |
Percentage of conversion price | 130.00% |  |  |  |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option two |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Percentage of closing sale price of common stock and conversion rate product | 98.00% |  |  |  |  |  |  |
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% |  |  |  |  |  |
Teradyne [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  | $ 100,800,000 |
Current debt, Conversion |  |  |  |  |  |  | 1,400,000 |
Debt |  |  |  |  |  |  | 6,600,000 |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | 94,600,000 |
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Deferred Tax Assets, Other |  |  |  |  |  |  | 1,800,000 |
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  | $ 0 |

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