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Cash, Cash Equivalents and Investments - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jan. 02, 2016 | Jan. 03, 2015
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Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | $ 32,487 | $ 51,658
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 8,324 | 7,419
Total fair value of available-for-sale securities, continuous loss position | 40,811 | 59,077
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (40) | (73)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (876) | (581)
Available-for-sale securities, total gross unrealized losses | (916) | (654)
Cost |  |
Due in one year or less, Cost | 150,455 |
Due after one year through ten years, Cost | 26,113 |
Due after ten years, Cost | 15,345 |
Total Cost | 191,913 |
Fair Value |  |
Due in one year or less, Fair Value | 150,477 |
Due after one year through ten years, Fair Value | 26,093 |
Due after ten years, Fair Value | 14,471 |
Total Fair Value | 191,041 |
Municipal bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 29,271 | 23,735
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 1,198 |
Total fair value of available-for-sale securities, continuous loss position | 30,469 | 23,735
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (30) | (25)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (2) |
Available-for-sale securities, total gross unrealized losses | (32) | (25)
Corporate bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 996 | 20,327
Total fair value of available-for-sale securities, continuous loss position | 996 | 20,327
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (3) | (35)
Available-for-sale securities, total gross unrealized losses | (3) | (35)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 7,126 | 7,419
Total fair value of available-for-sale securities, continuous loss position | 7,126 | 7,419
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (874) | (581)
Available-for-sale securities, total gross unrealized losses | (874) | (581)
Asset-backed securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months |  | 5,080
Total fair value of available-for-sale securities, continuous loss position |  | 5,080
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 | 2,220 | 2,516
Total fair value of available-for-sale securities, continuous loss position | 2,220 | 2,516
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (7) | (10)
Available-for-sale securities, total gross unrealized losses | $ (7) | $ (10)

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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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 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=27724398&loc=d3e27337-111563 + 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 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=27724398&loc=d3e27337-111563 + 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 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: 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 + Details
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