Stock Repurchase Program	9 Months Ended
Sep. 30, 2012
Stock Repurchase Program	R. Stock Repurchase Program In November 2010, Teradyne’s board of directors authorized a stock repurchase program for up to $200 million. In the three and nine months ended September 30, 2012, Teradyne did not repurchase any shares. In the three and nine months ended October 2, 2011, Teradyne repurchased 2.0 million shares of common stock for $23.9 million at an average price of $12.06. Cumulatively, as of September 30, 2012, Teradyne has repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.

Stock Repurchase Program

9 Months Ended

Sep. 30, 2012

R. Stock Repurchase Program

In November 2010, Teradyne’s board of directors authorized a stock repurchase program for up to $200 million. In the three and nine months ended September 30, 2012, Teradyne did not repurchase any shares. In the three and nine months ended October 2, 2011, Teradyne repurchased 2.0 million shares of common stock for $23.9 million at an average price of $12.06. Cumulatively, as of September 30, 2012, Teradyne has repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.