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Stock Repurchase Program	3 Months Ended
Stock Repurchase Program	Apr. 01, 2012
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Q. Stock Repurchase Program In November 2010, the Board authorized a stock repurchase program for up to $200 million. In the three months ended April 1, 2012 and April 3, 2011, Teradyne did not repurchase any shares. Cumulatively, as of April 1, 2012, Teradyne has repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.