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Investments - Contractual Maturity (Details)
$ in Thousands
Jul. 01, 2018
USD ($)
Amortized Cost  
Due in 1 year or less $ 103,395
Due in 1-2 years 120,978
Due in 2-5 years 45,963
Amortized Cost 270,336
Estimated Fair Value  
Due in 1 year or less 103,252
Due in 1-2 years 119,343
Due in 2-5 years 45,093
Total investments in available-for-sale securities $ 267,688