Quarterly report pursuant to Section 13 or 15(d)

Sales to Major Customers (Details)

v3.20.2
Sales to Major Customers (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2020
USD ($)
Sep. 28, 2019
Sep. 26, 2020
USD ($)
customer
Sep. 28, 2019
customer
Segment Reporting, Asset Reconciling Item        
Number of major customers | customer     2 2
Sales Revenue, Net | Customer Concentration Risk | Major Customer One        
Segment Reporting, Asset Reconciling Item        
Percent of consolidated revenue 6.00% 12.00% 12.00% 13.00%
Sales Revenue, Net | Customer Concentration Risk | Major Customer Two        
Segment Reporting, Asset Reconciling Item        
Percent of consolidated revenue 10.00% 14.00% 9.00% 14.00%
Sales Revenue, Net | Customer Concentration Risk | Two Major Customers        
Segment Reporting, Asset Reconciling Item        
Accounts receivable from major customers | $ $ 12.5   $ 12.5