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Cash and Investments (Tables) | 12 Months Ended
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Dec. 27, 2014
Investments, Debt and Equity Securities [Abstract] |
Cash, Cash Equivalents and Available-for-sale Investments | The following table presents cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
| December 27, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 34,066 |  |  | — |  |  | $ | — |  |  | $ | 34,066 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 610 |  |  | — |  |  | — |  |  | 610 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 805 |  |  | — |  |  | — |  |  | 805 |
U.S. Treasury securities | 2,498 |  |  |  |  |  | (1 | ) |  | 2,497 |
U.S. Government agency securities | 20,556 |  |  | 1 |  |  | (19 | ) |  | 20,538 |
Municipal securities | 3,755 |  |  | 1 |  |  | (7 | ) |  | 3,749 |
Corporate debt securities | 21,722 |  |  | 1 |  |  | (26 | ) |  | 21,697 |
Total cash, cash equivalents, and marketable securities | $ | 84,012 |  |  | $ | 3 |  |  | $ | (53 | ) |  | $ | 83,962 |
| December 28, 2013
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 43,139 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,139 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 876 |  |  | — |  |  | — |  |  | 876 |
Commercial paper | 750 |  |  | — |  |  | — |  |  | 750 |
Marketable securities: |  |  |  |  |  |  |
U.S. Treasury Securities | 5,036 |  |  | — |  |  | — |  |  | 5,036 |
U.S. Government agency securities | 11,980 |  |  | 4 |  |  | (4 | ) |  | 11,980 |
Municipal securities | 9,756 |  |  | 11 |  |  | (4 | ) |  | 9,763 |
Corporate debt securities | 21,316 |  |  | 7 |  |  | (5 | ) |  | 21,318 |
Total cash, cash equivalents, and marketable securities | $ | 92,853 |  |  | $ | 22 |  |  | $ | (13 | ) |  | $ | 92,862 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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