Retirement Plans (Tables)

9 Months Ended

Oct. 04, 2015

Postretirement Benefit Plans

Net Periodic Pension and Postretirement Benefit Income Costs

For the three and nine months ended October 4, 2015 and September 28, 2014, Teradyne’s net periodic pension cost was comprised of the following:

	For the Three Months Ended
	October 4, 2015						September 28, 2014
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	616		$	259		$	555		$	206
Interest cost		3,285			357			3,219			431
Expected return on plan assets		(3,629	)		(185	)		(3,126	)		(209	)
Amortization of prior service cost		34			—			34			—
Total net periodic pension cost	$	306		$	431		$	682		$	428
	For the Nine Months Ended
	October 4, 2015						September 28, 2014
	United States			Foreign			United States			Foreign
	(in thousands)
Service cost	$	1,847		$	768		$	1,663		$	705
Interest cost		9,856			1,101			9,656			1,446
Expected return on plan assets		(10,888	)		(595	)		(9,375	)		(685	)
Amortization of prior service cost		101			—			101			—
Actuarial (gain) loss		(3	)		—			362			—
Total net periodic pension cost	$	913		$	1,274		$	2,407		$	1,466

Defined Benefit Pension Plans

Net Periodic Pension and Postretirement Benefit Income Costs

For the three and nine months ended October 4, 2015 and September 28, 2014, Teradyne’s net periodic postretirement benefit income was comprised of the following:

	For the Three Months Ended						For the Nine Months Ended
	October 4, 2015			September 28, 2014			October 4, 2015			September 28, 2014
	(in thousands)
Service cost	$	12		$	15		$	36		$	44
Interest cost		59			84			177			252
Amortization of prior service benefit		(150	)		(150	)		(449	)		(449	)
Actuarial gain		—			—			(19	)		(247	)
Total net periodic post-retirement benefit	$	(79	)	$	(51	)	$	(255	)	$	(400	)