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Schedule of Unrealized Loss on Available for Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 27, 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 | $ 15,916 | $ 26,355
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 72 | 455
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 14,590 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 212 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 30,506 | 26,355
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 284 | 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 | 2,652 | 3,429
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 13 | 72
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 2,445 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 42 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 5,097 | 3,429
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 55 | 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 | 13,264 | 22,169
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss | 59 | 370
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value | 11,385 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 162 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 24,649 | 22,169
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | 221 | 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 |  | 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 | 760 |
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss | 8 |
Available-for-sale investments with unrealized losses, Fair Value, Total | 760 | 757
Available-for-sale investments with unrealized losses, Unrealized Loss, Total | $ 8 | $ 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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