Quarterly report pursuant to Section 13 or 15(d)

Sales to Major Customers (Details)

v3.10.0.1
Sales to Major Customers (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
Sep. 29, 2018
USD ($)
customer
Sep. 30, 2017
customer
Segment Reporting, Asset Reconciling Item        
Number of major customers | customer     3 3
Sales Revenue, Net | Customer Concentration Risk | Major Customer One        
Segment Reporting, Asset Reconciling Item        
Percent of consolidated revenue 13.00% 20.00% 15.00% 20.00%
Sales Revenue, Net | Customer Concentration Risk | Major Customer Two        
Segment Reporting, Asset Reconciling Item        
Percent of consolidated revenue 14.00% 17.00% 15.00% 17.00%
Sales Revenue, Net | Customer Concentration Risk | Major Customer Three        
Segment Reporting, Asset Reconciling Item        
Percent of consolidated revenue 15.00% 4.00% 12.00% 4.00%
Sales Revenue, Net | Customer Concentration Risk | Three Major Customers        
Segment Reporting, Asset Reconciling Item        
Accounts receivable from major customers | $ $ 74.1   $ 74.1