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Warranties (Tables)
 12 Months Ended
Dec. 29, 2012
Product Warranties Disclosures [Abstract]  
Components of the warranty accrual
Components of the warranty accrual, which were included in the accompanying consolidated balance sheets with other current liabilities, were as follows (in thousands):
 
 
Years Ended
 
December 29, 2012
 
December 31,
2011
Balance as of beginning of period
$
4,797

 
$
3,129

Accruals for warranties issued during period
4,156

 
4,747

Aggregate changes in liabilities related to preexisting warranties
2,403

 
4,194

Settlements during the period
(7,153
)
 
(7,273
)
Balance as of end of period
$
4,203

 
$
4,797