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Warranties (Tables)
 3 Months Ended
Mar. 30, 2014
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserve
Changes in the warranty reserve for the three-month periods ended March 30, 2014, and March 31, 2013, are as follows: 
 
Three Months Ended
 
March 30,
2014
 
March 31,
2013
Balance, beginning of fiscal year
$
379

 
$
370

Changes in product warranties (included in) charged to earnings
(19
)
 
154

Use of reserve for warranty obligations
(36
)
 
(165
)
Balance, end of period
$
324

 
$
359