XML 111 R92.htm IDEA: XBRL DOCUMENT v3.19.1
Computation of Basic and Diluted Net (Loss) Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Net Income Loss Per Common Share    
Net income for basic and diluted net income per share $ 109,138 $ 86,974
Weighted average common shares-basic 173,532 195,255
Incremental shares from assumed conversion of convertible notes [1] 2,186 4,398
Convertible note hedge warrant shares [2]   1,830
Employee stock purchase plan 11 14
Dilutive potential common shares 3,440 8,229
Weighted average common shares-diluted 176,972 203,484
Net income per common share-basic $ 0.63 $ 0.45
Net income per common share-diluted $ 0.62 $ 0.43
Restricted Stock Units    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 1,021 1,666
Stock Options    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 222 321
[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 $31.70, 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 $39.78, 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.