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Schedule of Unrealized Loss on Available for Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 28, 2014 | Dec. 28, 2013
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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 | $ 9,572 | $ 26,355
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 9 | 455
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 14,682 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 149 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 24,254 | 26,355
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 158 | 455
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value | 1,010 | 3,429
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 2 | 72
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 2,469 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 21 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 3,479 | 3,429
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 23 | 72
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 | 5,562 | 22,169
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 7 | 370
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 11,451 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 121 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 17,013 | 22,169
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 128 | 370
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 | 3,000 | 757
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss |  | 13
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 762 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 7 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 3,762 | 757
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | $ 7 | $ 13

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&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=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&loc=d3e27290-111563 + Details
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