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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 28, 2013
--- | --- | ---
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | $ 32,086 | $ 13,684
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 11,505 | 10,632
Total fair value of available-for-sale securities, continuous loss position | 43,591 | 24,316
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (44) | (15)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (920) | (1,793)
Available-for-sale securities, total gross unrealized losses | (964) | (1,808)
Cost |  |
Due in one year or less, Cost | 155,375 |
Due after one year through ten years, Cost | 97,195 |
Due after ten years, Cost | 25,005 |
Total Cost | 277,575 |
Fair Value |  |
Due in one year or less, Fair Value | 155,485 |
Due after one year through ten years, Fair Value | 97,329 |
Due after ten years, Fair Value | 24,085 |
Total Fair Value | 276,899 |
Corporate bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 16,564 | 2,605
Total fair value of available-for-sale securities, continuous loss position | 16,564 | 2,605
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (33) | (4)
Available-for-sale securities, total gross unrealized losses | (33) | (4)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 11,505 | 10,632
Total fair value of available-for-sale securities, continuous loss position | 11,505 | 10,632
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (920) | (1,793)
Available-for-sale securities, total gross unrealized losses | (920) | (1,793)
Municipal bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 7,893 | 11,079
Total fair value of available-for-sale securities, continuous loss position | 7,893 | 11,079
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (3) | (11)
Available-for-sale securities, total gross unrealized losses | (3) | (11)
Asset-backed securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 5,102 |
Total fair value of available-for-sale securities, continuous loss position | 5,102 |
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (3) |
Available-for-sale securities, total gross unrealized losses | (3) |
International government bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 2,527 |
Total fair value of available-for-sale securities, continuous loss position | 2,527 |
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (5) |
Available-for-sale securities, total gross unrealized losses | $ (5) |

X
- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after one year and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor as trading securities. + References No definition available. + 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 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 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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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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