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Stock Repurchase Program	3 Months Ended
Stock Repurchase Program	Mar. 31, 2013
Stock Repurchase Program	Q. Stock Repurchase Program In November 2010, Teradyne’s board of directors authorized a stock repurchase program for up to $200 million. In the three months ended March 31, 2013 and April 1, 2012, Teradyne did not repurchase any shares. Cumulatively, as of March 31, 2013, Teradyne has repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.