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Cash and Investments (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 27, 2015 | Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 74,797 | $ 84,012
Gross Unrealized Gains | 8 | 3
Gross Unrealized Losses | (16) | (53)
Estimated Fair Market Value | $ 74,789 | $ 83,962
Investment maturity period, less than | 2 years | 2 years
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 24,722 | $ 34,066
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 24,722 | 34,066
Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,699 | 610
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 1,699 | 610
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,799 | 805
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 1,799 | 805
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,499 | 2,498
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (1)
Estimated Fair Market Value | 2,499 | 2,497
U.S. Government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,030 | 20,556
Gross Unrealized Gains | 5 | 1
Gross Unrealized Losses | (3) | (19)
Estimated Fair Market Value | 20,032 | 20,538
Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,729 | 3,755
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (1) | (7)
Estimated Fair Market Value | 3,730 | 3,749
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,319 | 21,722
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (12) | (26)
Estimated Fair Market Value | $ 20,308 | $ 21,697

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