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Warranties (Tables)
 6 Months Ended
Jun. 29, 2014
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserve
Changes in the warranty reserve for the six-month periods ended June 29, 2014, and June 30, 2013, are as follows: 
 
Six Months Ended
 
June 29,
2014
 
June 30,
2013
Balance, beginning of fiscal year
$
379

 
$
370

Changes in product warranties charged to earnings
101

 
286

Use of reserve for warranty obligations
(152
)
 
(310
)
Balance, end of period
$
328

 
$
346