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Investments (Summary by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 377,155 $ 404,365
Maturing after one year through five years 63,255 55,601
Total $ 440,410 $ 459,966