Fair Value of Financial Instruments (Details 1) $ in Thousands	Jul. 01, 2017 USD ($)
Summary of maturities of marketable securities
Due in less than one year, adjusted cost	$ 401
Due after one year but within five years, adjusted cost	1,214
Due after five years but within ten years, adjusted cost	469
Due after ten years, adjusted cost	707
Available-for-sale Debt Securities, Amortized Cost Basis	2,791
Due in less than one year, fair value	278
Due after one year but within five years, fair value	1,169
Due after five years but within ten years, fair value	394
Due after ten years, fair value	650
Asset measured at, fair value	$ 2,491