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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 | 9 Months Ended
--- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013
Net Income Loss Per Common Share |  |  |  |  |  |  |  |
Net income for basic and diluted net income per share | $ 82,949 |  | $ 69,459 |  | $ 185,083 |  | $ 142,604 |
Weighted average common shares-basic | 207,381 |  | 191,307 |  | 198,367 |  | 190,521 |
Incremental shares from assumed conversion of convertible notes |  |  | 23,257 | [1] | 6,684 | [1] | 23,303 | [1]
Convertible note hedge warrant shares | 8,885 | [2] | 18,678 | [2] | 16,744 | [2] | 18,742 | [2]
Employee stock purchase rights | 21 |  | 19 |  | 28 |  | 35 |
Dilutive potential common shares | 10,952 |  | 44,521 |  | 25,428 |  | 44,644 |
Weighted average common shares-diluted | 218,333 |  | 235,828 |  | 223,795 |  | 235,165 |
Net income per common share-basic | $ 0.40 |  | $ 0.36 |  | $ 0.93 |  | $ 0.75 |
Net income per common share-diluted | $ 0.38 |  | $ 0.29 |  | $ 0.83 |  | $ 0.61 |
Restricted Stock Units |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements | 1,167 |  | 1,102 |  | 975 |  | 1,000 |
Stock Option |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements | 879 |  | 1,465 |  | 997 |  | 1,564 |
[1] | Incremental shares from conversion of the convertible notes for the nine months ended September 28, 2014 were calculated using the difference between the average Teradyne stock price from January 1, 2014 through March 12, 2014 and the conversion price of $5.4750, 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 from January 1, 2014 to March 12, 2014 and adjusted for the number of days the convertible notes were outstanding. Incremental shares from assumed conversion of the convertible notes for the three and nine months ended September 29, 2013 were calculated using the difference between the average Teradyne stock price for the period the convertible notes were outstanding and the conversion price of $5.48, multiplied by the 34.7 million shares to be issued upon conversion. 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 for the three and nine months ended September 28, 2014 are calculated using the difference between the average Teradyne stock price for the period the warrants were outstanding and the warrant price of $7.63 and $7.64, respectively, multiplied by the weighted average warrant shares outstanding. The result of this calculation, representing the total intrinsic value of the warrant, is divided by the average Teradyne stock price for the period the warrants were outstanding. Convertible note hedge warrant shares for the three and nine months ended September 29, 2013 are calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by the 34.7 million shares that would be issued upon conversion. The result of this calculation, representing the total intrinsic value of the warrant, is divided by the average Teradyne stock price for the period.

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