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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 05, 2015 | Jun. 29, 2014 | Jul. 05, 2015 | Jun. 29, 2014
Net Income Loss Per Common Share |  |  |  |  |
Net income for basic and diluted net income per share |  | $ 102,879 | $ 101,205 | $ 135,666 | $ 102,134
Weighted average common shares-basic |  | 213,845 | 194,408 | 215,516 | 193,860
Incremental shares from assumed conversion of convertible notes | [1] |  |  |  | 10,026
Convertible note hedge warrant shares | [2] |  | 20,406 |  | 20,674
Employee stock purchase plan |  | 70 | 43 | 49 | 32
Dilutive potential common shares |  | 1,651 | 22,160 | 1,638 | 32,666
Weighted average common shares-diluted |  | 215,496 | 216,568 | 217,154 | 226,526
Net income per common share-basic |  | $ 0.48 | $ 0.52 | $ 0.63 | $ 0.53
Net income per common share-diluted |  | $ 0.48 | $ 0.47 | $ 0.62 | $ 0.45
Restricted Stock Units |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  | 978 | 705 | 940 | 878
Stock Option |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  | 603 | 1,006 | 649 | 1,056
[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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