{"cik":97210,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"TERADYNE, INC.","units":{"USD":[{"end":"2010-12-31","val":150182000,"accn":"0001193125-12-087457","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2011-12-31","val":159956000,"accn":"0001193125-13-087821","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":159956000,"accn":"0001193125-12-087457","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-12-31","val":171059000,"accn":"0001193125-14-077218","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2012-12-31","val":171059000,"accn":"0001193125-13-087821","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2013-12-31","val":0,"accn":"0001193125-15-067671","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-067671","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"}]}}