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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 30, 2013 | Dec. 29, 2012
--- | --- | ---
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | $ 25,507 | $ 26,695
Fair value of available-for-sale securities, continuous loss position for twelve month or longer | 11,189 | 11,369
Total fair value of available-for-sale securities, continuous loss position | 36,696 | 38,064
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (19) | (12)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (1,261) | (1,156)
Available-for-sale securities, total gross unrealized losses | (1,280) | (1,168)
Cost |  |
Due in one year or less, Cost | 121,784 |
Due after one year through ten years, Cost | 99,419 |
Due after ten years, Cost | 67,935 |
Total Cost | 289,138 |
Fair Value |  |
Due in one year or less, Fair Value | 121,854 |
Due after one year through ten years, Fair Value | 99,698 |
Due after ten years, Fair Value | 66,674 |
Total Fair Value | 288,226 |
Municipal bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 13,196 | 17,152
Total fair value of available-for-sale securities, continuous loss position | 13,196 | 17,152
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (10) | (7)
Available-for-sale securities, total gross unrealized losses | (10) | (7)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve month or longer | 11,189 | 11,369
Total fair value of available-for-sale securities, continuous loss position | 11,189 | 11,369
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (1,261) | (1,156)
Available-for-sale securities, total gross unrealized losses | (1,261) | (1,156)
Corporate bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 6,989 | 9,543
Total fair value of available-for-sale securities, continuous loss position | 6,989 | 9,543
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (7) | (5)
Available-for-sale securities, total gross unrealized losses | (7) | (5)
Asset-backed securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 5,322 |
Total fair value of available-for-sale securities, continuous loss position | 5,322 |
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (2) |
Available-for-sale securities, total gross unrealized losses | $ (2) |

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