Accounts Receivable (Details) $ in Millions	9 Months Ended	12 Months Ended
	Oct. 01, 2017 USD ($) Customer	Jan. 01, 2017 USD ($) Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts | $	$ 1.4	$ 1.0
Accounts Receivable | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, customers | Customer	10	10
Concentration risk, percent	55.40%	57.30%