I. Product Warranty

Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance, delivery or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The warranty balance below is included in other accrued liabilities on the balance sheet.


	For the Three Months Ended						For the Nine Months Ended
	October 2, 2016			October 4, 2015			October 2, 2016			October 4, 2015
	(in thousands)
Balance at beginning of period	$	8,784		$	8,228		$	6,925		$	8,942
Acquisition		—			—			—			372
Accruals for warranties issued during the period		3,248			3,261			11,626			9,548
Adjustments related to pre-existing warranties		(460	)		(1,211	)		(637	)		(3,039	)
Settlements made during the period		(3,249	)		(2,370	)		(9,591	)		(7,915	)

Balance at end of period	$	8,323		$	7,908		$	8,323		$	7,908

When Teradyne receives revenue for extended warranties beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The extended warranty balance below is included in short and long-term deferred revenue and customer advances on the balance sheet.


	For the Three Months Ended						For the Nine Months Ended
	October 2, 2016			October 4, 2015			October 2, 2016			October 4, 2015
Balance at beginning of period	$	47,723		$	43,299		$	46,499		$	43,300
Acquisition		—			—			—			699
Deferral of new extended warranty revenue		7,048			10,442			22,773			22,818
Recognition of extended warranty deferred revenue		(6,420	)		(6,252	)		(20,921	)		(19,328	)

Balance at end of period	$	48,351		$	47,489		$	48,351		$	47,489