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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 28, 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 | $ 24,008 | $ 13,684
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 10,993 | 10,632
Total fair value of available-for-sale securities, continuous loss position | 35,001 | 24,316
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (22) | (15)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (1,432) | (1,793)
Available-for-sale securities, total gross unrealized losses | (1,454) | (1,808)
Cost |  |
Due in one year or less, Cost | 128,339 |
Due after one year through ten years, Cost | 116,829 |
Due after ten years, Cost | 38,895 |
Total Cost | 284,063 |
Fair Value |  |
Due in one year or less, Fair Value | 128,444 |
Due after one year through ten years, Fair Value | 117,062 |
Due after ten years, Fair Value | 37,463 |
Total Fair Value | 282,969 |
Municipal bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 8,154 | 11,079
Total fair value of available-for-sale securities, continuous loss position | 8,154 | 11,079
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (2) | (11)
Available-for-sale securities, total gross unrealized losses | (2) | (11)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 10,993 | 10,632
Total fair value of available-for-sale securities, continuous loss position | 10,993 | 10,632
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (1,432) | (1,793)
Available-for-sale securities, total gross unrealized losses | (1,432) | (1,793)
Corporate bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 10,992 | 2,605
Total fair value of available-for-sale securities, continuous loss position | 10,992 | 2,605
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (15) | (4)
Available-for-sale securities, total gross unrealized losses | (15) | (4)
Asset-backed securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 2,791 |
Total fair value of available-for-sale securities, continuous loss position | 2,791 |
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 | 1,471 |
Total fair value of available-for-sale securities, continuous loss position | 1,471 |
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (1) |
Available-for-sale securities, total gross unrealized losses | (1) |
U.S. government agency |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 600 |
Total fair value of available-for-sale securities, continuous loss position | 600 |
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (1) |
Available-for-sale securities, total gross unrealized losses | $ (1) |

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