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Net Income per Common Share (Tables) | 3 Months Ended
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Mar. 30, 2014
Computation of Basic and Diluted Net Income Per Common Share | The following table sets forth the computation of basic and diluted net income per common share:
|  | For the Three Months Ended |
|  | March 30, 2014 |  |  | March 31, 2013 |
|  | (in thousands, except per share amounts) |
Net income for basic and diluted net income per share |  | $ | 929 |  |  | $ | 6,589 |
Weighted average common shares-basic |  |  | 193,311 |  |  |  | 189,686 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |
Incremental shares from assumed conversion of convertible notes(1) |  |  | 20,052 |  |  |  | 23,386 |
Convertible note hedge warrant shares(2) |  |  | 20,942 |  |  |  | 18,859 |
Restricted stock units |  |  | 1,051 |  |  |  | 1,123 |
Stock options |  |  | 1,106 |  |  |  | 1,676 |
Employee stock purchase plan |  |  | 22 |  |  |  | 27 |
Dilutive potential common shares |  |  | 43,173 |  |  |  | 45,071 |
Weighted average common shares-diluted |  |  | 236,484 |  |  |  | 234,757 |
Net income per common share-basic |  | $ | 0.00 |  |  | $ | 0.03 |
Net income per common share-diluted |  | $ | 0.00 |  |  | $ | 0.03 |
(1) | Incremental shares from conversion of the convertible notes for the three months ended March 30, 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 during the three months ended March 30, 2014. Incremental shares from assumed conversion of the convertible notes for the three months ended March 31, 2013 were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.4750, 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 months ended March 30, 2014 and March 31, 2013 are 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, is divided by the average Teradyne stock price for the period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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