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Fair Value of Financial Instruments (Details 2) - Auction rate securities - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
9 Months Ended
Oct. 03, 2015
Jul. 04, 2015
Jan. 03, 2015
Weighted Average | Discounted cash flow      
Quantitative information for Level 3 Fair Value Measurements Assets      
Estimated yield (as a percent) 1.04%    
Expected holding period 10 years    
Estimated discount rate (as a percent) 3.46%    
Assets and liabilities measured at fair value on recurring basis      
Quantitative information for Level 3 Fair Value Measurements Assets      
Fair value balance at the end of the period $ 7,240 $ 7,179 $ 7,419