Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 26, 2020	Sep. 29, 2012	Dec. 31, 2019
Site Contingency [Line Items]
Litigation Settlement, Amount		$ 110,000
Environmental Costs Recovered	$ 42,000
Sales covered by the Iran Threat Reduction and Syria Human Rights Act of 2012			$ 4,770
Huntsville Site [Member]
Site Contingency [Line Items]
Environmental Remediation Expense To Date	7,000
Additional Expected Project Expenditures Low Estimate	3,400
Additional Expected Project Expenditures High Estimate	10,000
Norco Site [Member] | Remediation, Project Management, Regulatory Oversight, and Investigative and Feasability Studies [Member]
Site Contingency [Line Items]
Environmental Remediation Expense To Date	75,300
Additional Expected Project Expenditures Low Estimate	6,500
Additional Expected Project Expenditures High Estimate	17,700
Global ECS
Site Contingency [Line Items]
Foreign tax and other loss contingencies, net of taxes	$ 32,700