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Cash and Investments (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 83,148 | $ 84,012
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | (65) | (53)
Estimated Fair Market Value | 83,085 | 83,962
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,884 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 1,884 |
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 20,193 | 20,556
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (29) | (19)
Estimated Fair Market Value | 20,165 | 20,538
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,759 | 21,722
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (23) | (26)
Estimated Fair Market Value | 14,736 | 21,697
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 32,996 | 34,066
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 32,996 | 34,066
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 590 | 610
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 590 | 610
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,411 | 2,498
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (10) | (1)
Estimated Fair Market Value | 4,401 | 2,497
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,568 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 4,568 |
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 805
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 805
Municipal securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 3,747 | 3,755
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (3) | (7)
Estimated Fair Market Value | $ 3,745 | $ 3,749

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