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Net Income Per Common Share (Tables) | 6 Months Ended
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Jul. 01, 2018
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 |  |  | For the Six Months Ended |
|  | July 1, 2018 |  |  | July 2, 2017 |  |  | July 1, 2018 |  |  | July 2, 2017 |
|  | (in thousands, except per share amounts) |
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 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares from assumed conversion of convertible notes (1) |  |  | 2,643 |  |  |  | 752 |  |  |  | 3,520 |  |  |  | 376 |
Convertible note hedge warrant shares (2) |  |  | — |  |  |  | — |  |  |  | 915 |  |  |  | — |
Restricted stock units |  |  | 1,219 |  |  |  | 1,622 |  |  |  | 1,444 |  |  |  | 1,576 |
Stock options |  |  | 274 |  |  |  | 318 |  |  |  | 298 |  |  |  | 354 |
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 |
(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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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Namespace Prefix: | us-gaap_
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Period Type: | duration