Fair Value of Financial Instruments - Auction Rate Securities (Details) - Auction rate securities - Significant Unobservable Inputs (Level 3) - Weighted Average - Discounted cash flow	9 Months Ended
Oct. 01, 2016
Quantitative information for Level 3 Fair Value Measurements Assets
Estimated yield (as a percent)	1.12%
Expected holding period	10 years
Estimated discount rate (as a percent)	2.74%

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