Restructuring and Asset Impairment Charges - Narrative (Details) $ in Thousands		3 Months Ended			9 Months Ended
	Dec. 29, 2018	Sep. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of employees	200
Restructuring charges			$ 20,500
Severance costs			10,800
Asset impairment charges			8,600
Other restructuring costs			$ 1,100
Estimated restructuring costs remaining		$ 12,000			$ 12,000
Expected savings from restructuring		12,000			12,000
Restructuring Charges		672		$ 0	672	$ 0
Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs remaining		$ 10,800			$ 10,800