Stock Repurchase Program	12 Months Ended
Dec. 31, 2015
Stock Repurchase Program	R. STOCK REPURCHASE PROGRAM In January 2015, the Board of Directors cancelled the November 2010 stock repurchase program and authorized a new stock repurchase program for up to $500 million of common stock. The cumulative repurchases as of December 31, 2015 totaled 15.6 million shares of common stock for a total purchase price of $300 million at an average price per share of $19.20. The total price includes commissions and is recorded as a reduction to retained earnings. In November 2010, the Board authorized a stock repurchase program for up to $200 million. Under the November 2010 plan, Teradyne repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.

R. STOCK REPURCHASE PROGRAM

In January 2015, the Board of Directors cancelled the November 2010 stock repurchase program and authorized a new stock repurchase program for up to $500 million of common stock. The cumulative repurchases as of December 31, 2015 totaled 15.6 million shares of common stock for a total purchase price of $300 million at an average price per share of $19.20. The total price includes commissions and is recorded as a reduction to retained earnings.

In November 2010, the Board authorized a stock repurchase program for up to $200 million. Under the November 2010 plan, Teradyne repurchased 2.6 million shares of common stock for $31.2 million at an average price of $11.84.