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Schedule of Unrealized Loss on Available for Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2013 | Dec. 29, 2012
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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 | $ 38,630 | $ 4,157
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 643 | 7
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 | 38,630 | 4,157
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 643 | 7
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value | 4,074 |
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 112 |
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 | 4,074 |
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 112 |
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 | 33,801 | 3,387
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 517 | 6
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 | 33,801 | 3,387
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 517 | 6
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 | 755 | 770
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 14 | 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 | 755 | 770
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | $ 14 | $ 1

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + 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=27724398&loc=d3e27290-111563 + Details
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