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Fair Value of Financial Instruments - Auction Rate Securities (Details) - Auction rate securities - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
6 Months Ended
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Weighted Average | Discounted cash flow      
Quantitative information for Level 3 Fair Value Measurements Assets      
Estimated yield (as a percent) 1.02%    
Expected holding period 10 years    
Estimated discount rate (as a percent) 2.89%    
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 $ 6,921 $ 6,845 $ 7,126