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v3.22.0.1

Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2022 USD ($) | May 01, 2020 USD ($) | Dec. 12, 2016 USD ($) Customer $ / shares shares | Oct. 03, 2021 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 04, 2021 | Dec. 31, 2016 USD ($) | Apr. 27, 2015 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 116,980 | $ 459,971 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 1.25% |  |
Repurchase of common stock |  |  |  |  | $ 600,000 | 88,465 | $ 500,000 |  |  |
Trading days measurement period | Customer |  |  | 5 |  |  |  |  |  |  |
Debt issuance costs, amortization period |  |  |  |  | 7 years |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 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 LIBOR plus a margin ranging from 1.00% to 1.75% 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 |  |  |  |  |
Debt instrument conversion converted instrument amount |  |  |  |  | $ 343,000 |  |  |  |  |
Convertible common shares |  |  |  |  | 1,512 | $ 3,787 |  |  |  |
Expected principal interest payments in next 12 months |  |  |  |  | 1,500 |  |  |  |  |
Expected principal interest payments,thereafter |  |  |  |  | $ 1,500 |  |  |  |  |
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA |  |  |  |  | 15.00% |  |  |  |  |
Other Income Expense [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Gain loss on debt conversion |  |  |  |  | $ 28,800 |  |  |  |  |
Convertible Common Shares [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Convertible common shares |  |  |  |  | $ 20,700 |  |  |  |  |
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 |  | $ 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 |  | $ 33,000 |  |  |  |  |
Repurchase of common stock |  |  | $ 50,100 |  |  |  |  |  |  |
Repurchase of stock, shares | shares |  |  | 2,000,000.0 |  |  |  |  |  |  |
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 | Customer |  |  | 5 |  |  |  |  |  |  |
Debt instrument conversion price | $ / shares |  |  | $ 31.52 | $ 31.52 | $ 31.52 |  |  |  |  |
Shares that would be issued upon conversion | shares |  |  |  | 4,400,000 | 14,600,000 |  |  |  |  |
Strike price per share of warrant | $ / shares |  |  |  |  | $ 39.55 |  |  |  |  |
Debt instrument, convertible, carrying amount of equity component |  |  |  |  | $ 100,800 |  |  |  |  |
Debt instrument, effective annual interest rate |  |  |  |  | 5.00% |  |  |  |  |
Financing cost |  |  |  |  | $ 600 |  |  |  | $ 7,200 |
Unamortized discount |  |  |  |  | $ 8,600 |  |  |  |  |
Debt Instrument, convertible, remaining discount amortization period |  |  |  |  | 2 years |  |  |  |  |
Value of notes converted |  |  |  |  | $ 606,900 |  |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Debt instrument conversion converted instrument amount | $ 362,600 |  |  |  |  |  |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option one |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Trading days measurement period | Customer |  |  | 20 |  |  |  |  |  |  |
Consecutive trading days measurement period | Customer |  |  | 30 |  |  |  |  |  |  |
Percentage of conversion price |  |  | 130.00% |  |  |  |  |  |  |
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option two |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 1,000 |  |  |  |  |  |  |
Percentage of closing sale price of common stock and conversion rate product |  |  | 98.00% |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Term of loan, years |  |  |  |  | 5 years |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  | $ 350,000
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 |  |  |  |  | 1.75% |  |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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