Revenue Recognition (Tables)

6 Months Ended

Jun. 29, 2018

Revenue From Contract With Customer [Abstract]

Customers as Percentage of Total Sales

The Company’s most significant customers (having accounted for 10% or more of sales) and their related sales as a percentage of total sales were as follows:  

	Three Months Ended						Six Months Ended
	June 29,			June 30,			June 29,			June 30,
	2018			2017			2018			2017
Lam Research Corporation		61.9	%		57.1	%		64.2	%		57.9	%
Applied Materials, Inc.		21.6			25.7			21.5			26.3
Total		83.5	%		82.8	%		85.7	%		84.2	%