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Schedule of Unrealized Loss on Available for Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value | $ 4,157 | $ 7,126
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 7 | 145
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value |  |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss |  |
Available-for-sale investments with unrealized losses, Fair Value, Total | 4,157 | 7,126
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 7 | 145
Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value |  | 468
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss |  | 18
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value |  |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss |  |
Available-for-sale investments with unrealized losses, Fair Value, Total |  | 468
Available-for-sale investments with unrealized losses, Unrealized Loss, Total |  | 18
Corporate bonds and direct obligations of government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value | 3,387 | 6,067
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 6 | 126
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value |  |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss |  |
Available-for-sale investments with unrealized losses, Fair Value, Total | 3,387 | 6,067
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 6 | 126
U.S. Treasury Obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value | 770 | 591
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 1 | 1
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value |  |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss |  |
Available-for-sale investments with unrealized losses, Fair Value, Total | 770 | 591
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | $ 1 | $ 1

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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