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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. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Net Income Loss Per Common Share |  |  |  |  |
Net income for basic and diluted net income per share |  | $ 101,037 | $ 174,976 | $ 188,010 | $ 260,197
Weighted average common shares-basic |  | 190,730 | 198,774 | 192,992 | 199,390
Incremental shares from assumed conversion of convertible notes | [1] | 2,643 | 752 | 3,520 | 376
Convertible note hedge warrant shares | [2] |  |  | 915 |
Employee stock purchase plan |  | 43 | 63 | 28 | 36
Dilutive potential common shares |  | 4,179 | 2,755 | 6,205 | 2,342
Weighted average common shares-diluted |  | 194,909 | 201,529 | 199,197 | 201,732
Net income per common share-basic |  | $ 0.53 | $ 0.88 | $ 0.97 | $ 1.30
Net income per common share-diluted |  | $ 0.52 | $ 0.87 | $ 0.94 | $ 1.29
Restricted Stock Units |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  | 1,219 | 1,622 | 1,444 | 1,576
Stock Options |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  | 274 | 318 | 298 | 354
[1] | Incremental shares from assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.80, multiplied by 14.5 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 notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.91, multiplied by 14.5 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.

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