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Cash and Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2015 | Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 84,609 | $ 84,012
Gross Unrealized Gains | 25 | 3
Gross Unrealized Losses | (8) | (53)
Estimated Fair Market Value | $ 84,626 | $ 83,962
Investment maturity period, less than | 2 years | 2 years
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 34,485 | $ 34,066
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 34,485 | 34,066
Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 642 | 610
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 642 | 610
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,434 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 6,434 |
Commercial paper, not included in cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,498 | 805
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 1,498 | 805
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 2,498
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Estimated Fair Market Value |  | 2,497
U.S. Government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,668 | 20,556
Gross Unrealized Gains | 17 | 1
Gross Unrealized Losses | (1) | (19)
Estimated Fair Market Value | 21,684 | 20,538
Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,714 | 3,755
Gross Unrealized Gains | 5 | 1
Gross Unrealized Losses | (1) | (7)
Estimated Fair Market Value | 3,718 | 3,749
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,168 | 21,722
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | (6) | (26)
Estimated Fair Market Value | $ 16,165 | $ 21,697

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