Investments Investments (Debt Securities by Maturity) (Details) $ in Thousands	Apr. 01, 2017 USD ($)
Contractual Maturity of Investment Securities
Due in less than one year, Amortized Cost	$ 2,251
Due after one year through five years, Amortized Cost	3,724
Due after five years through ten years, Amortized Cost	3,408
Due after ten years, Amortized Cost	5,806
Total Amortized Cost	15,189
Due in less than one year, Fair Value	2,238
Due after one year through five years, Fair Value	3,678
Due after five years through ten years, Fair Value	3,311
Due after ten years, Fair Value	5,883
Total Fair Value - Available-for-sale Debt Securities	$ 15,110