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Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) (USD $) | 3 Months Ended
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Mar. 29, 2015 | Mar. 30, 2014
Supplemental Cash Flow Information [Abstract] |  |
Document Fiscal Year Focus | 2015 |
Gross unrealized gains (losses) | $ (106,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss | $ (67,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Gross unrealized gains (losses), net of taxes | $ (67,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax | $ (42,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Contractual maturities period of marketable securities, minimum (in months) | 1 month |
Contractual maturities period of marketable securities, maximum (in months) | 25 months |

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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=27724398&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=27724398&loc=d3e27357-111563 + Details
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