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Supplemental Financial Information (Major Customers and Products) (Details) - customer	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Sales Revenue, Resale of Products
Concentration Risk [Line Items]
Concentration Risk, Percentage	85.00%	82.00%	71.00%	76.00%
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Number of Customers			2		2
Customer A | Sales Revenue, Product Line | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	13.00%	16.00%	11.00%	19.00%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage			14.00%		22.00%
Customer B | Sales Revenue, Product Line | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	12.00%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage			21.00%		15.00%
Customer D | Sales Revenue, Product Line | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage		11.00%
Customer E | Sales Revenue, Product Line | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage		11.00%

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