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Supplemental Financial Information (Schedule Of Warranty Liability Activity, II) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 30, 2013 | Dec. 29, 2012 | Mar. 31, 2012 | Dec. 31, 2011
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Supplemental Financial Information [Abstract] |  |  |  |
Warranty liabilities | $ 252 | $ 235 | $ 201 | $ 189
Less current portion | (151) |  | (121) |
Long-term warranty obligations | $ 101 |  | $ 80 |

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