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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