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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income (Loss) Per Common Share | The following table sets forth the computation of basic and diluted net income per common share:
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (in thousands, except per share amounts) |
Net income for basic and diluted net income per share |  | $ | 448,752 |  |  | $ | 715,501 |  |  | $ | 1,014,589 |
Weighted average common shares-basic |  |  | 154,310 |  |  |  | 158,434 |  |  |  | 164,960 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |
Convertible note hedge warrant shares (1) |  |  | 8,897 |  |  |  | 8,806 |  |  |  | 9,956 |
Incremental shares from assumed conversion of convertible notes (2) |  |  | 633 |  |  |  | 1,763 |  |  |  | 7,435 |
Restricted stock units |  |  | 423 |  |  |  | 657 |  |  |  | 1,180 |
Stock options |  |  | 34 |  |  |  | 52 |  |  |  | 86 |
Employee stock purchase rights |  |  | 7 |  |  |  | 22 |  |  |  | 8 |
Dilutive potential common shares |  |  | 9,994 |  |  |  | 11,300 |  |  |  | 18,665 |
Weighted average common shares-diluted |  |  | 164,304 |  |  |  | 169,734 |  |  |  | 183,625 |
Net income per common share-basic |  | $ | 2.91 |  |  | $ | 4.52 |  |  | $ | 6.15 |
Net income per common share-diluted |  | $ | 2.73 |  |  | $ | 4.22 |  |  | $ | 5.53 |
(1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant 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. (2) Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes 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.

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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/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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