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Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 05, 2015
Mar. 30, 2014
Net Income Loss Per Common Share    
Net income for basic and diluted net income per share $ 32,787us-gaap_NetIncomeLoss $ 929us-gaap_NetIncomeLoss
Weighted average common shares-basic 217,187us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 193,311us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed conversion of convertible notes   20,052us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities [1]
Convertible note hedge warrant shares   20,942us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants [2]
Employee stock purchase plan 28us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements 22us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements
Dilutive potential common shares 1,625us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 43,173us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares-diluted 218,812us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 236,484us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share-basic $ 0.15us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic
Net income per common share-diluted $ 0.15us-gaap_EarningsPerShareDiluted $ 0.00us-gaap_EarningsPerShareDiluted
Restricted Stock Units    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 901us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 1,051us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Stock Option    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 696us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember		 1,106us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
[1] Incremental shares from the assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
[2] Convertible note hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.6650, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. Teradyne's call option on its common stock (convertible note hedge transaction) was excluded from the calculation of diluted shares because the effect was anti-dilutive. See Note F: "Debt" regarding the convertible note hedge transaction.