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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Jan. 02, 2016 | Dec. 27, 2014
--- | --- | ---
Components of available for sale securities |  |
Total short term investments, Cost | $ 33,622 | $ 36,659
Total short term investments, Fair Market Value | 33,124 | 36,166
Bonds [Member] |  |
Components of available for sale securities |  |
Total short term investments, Cost | 33,622 | 36,659
Total short term investments, Fair Market Value | $ 33,124 | $ 36,166

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