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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
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Apr. 05, 2015 | Mar. 30, 2014
Net Income Loss Per Common Share |  |  |
Net income for basic and diluted net income per share | $ 32,787 us-gaap_NetIncomeLoss | $ 929 us-gaap_NetIncomeLoss |
Weighted average common shares-basic | 217,187 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 193,311 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Incremental shares from assumed conversion of convertible notes |  | 20,052 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [1]
Convertible note hedge warrant shares |  | 20,942 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | [2]
Employee stock purchase plan | 28 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements | 22 us-gaap_IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements |
Dilutive potential common shares | 1,625 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 43,173 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Weighted average common shares-diluted | 218,812 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 236,484 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Net income per common share-basic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic |
Net income per common share-diluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted |
Restricted Stock Units |  |  |
Net Income Loss Per Common Share |  |  |
Incremental shares attributable to share based payment arrangements | 901 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember | 1,051 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember |
Stock Option |  |  |
Net Income Loss Per Common Share |  |  |
Incremental shares attributable to share based payment arrangements | 696 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 1,106 us-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.

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