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Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 25, 2016 | Sep. 27, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Gross unrealized gains (losses) | $ (140) | $ (467)
Gross unrealized gains (losses), net of taxes | $ (88) | $ (294)
Contractual maturities period of marketable securities (in months) | 7 months |

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- Definition Marketable Securities; Contractual Maturities Term + References No definition available. + Details
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- Definition This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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