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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2013 | Dec. 29, 2012
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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 | $ 33,753 | $ 26,695
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 10,197 | 11,369
Total fair value of available-for-sale securities, continuous loss position | 43,950 | 38,064
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (96) | (12)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (2,228) | (1,156)
Available-for-sale securities, total gross unrealized losses | (2,324) | (1,168)
Cost |  |
Due in one year or less, Cost | 163,015 |
Due after one year through ten years, Cost | 64,223 |
Due after ten years, Cost | 62,232 |
Total Cost | 289,470 |
Fair Value |  |
Due in one year or less, Fair Value | 163,035 |
Due after one year through ten years, Fair Value | 64,195 |
Due after ten years, Fair Value | 60,004 |
Total Fair Value | 287,234 |
Municipal bonds |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 32,598 | 17,152
Total fair value of available-for-sale securities, continuous loss position | 32,598 | 17,152
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (95) | (7)
Available-for-sale securities, total gross unrealized losses | (95) | (7)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve months or longer | 10,197 | 11,369
Total fair value of available-for-sale securities, continuous loss position | 10,197 | 11,369
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (2,228) | (1,156)
Available-for-sale securities, total gross unrealized losses | (2,228) | (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 | 1,155 | 9,543
Total fair value of available-for-sale securities, continuous loss position | 1,155 | 9,543
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (1) | (5)
Available-for-sale securities, total gross unrealized losses | $ (1) | $ (5)

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