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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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Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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