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Plans of Restructuring - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Jul. 09, 2018	Sep. 29, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, pre-tax	$ 8,853	$ 0		$ 27,511	$ 0
Earnings Per Share, Diluted	$ (0.79)	$ (0.87)		$ (2.62)	$ (2.61)
Employee severance pay and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, pre-tax				$ 26,474
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, pre-tax				757
November 2014 restructuring initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, pre-tax				$ 27,511
Strategic Plan, 2018 to 2020 [Member] | Minimum [Member] | Scenario, Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Percentage Of Workforce Eliminated			2.00%
Restructuring and Related Cost, Expected Cost			$ 45,000
Earnings Per Share, Diluted			$ 0.22
Strategic Plan, 2018 to 2020 [Member] | Minimum [Member] | Scenario, Plan [Member] | Employee severance pay and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 40,000
Strategic Plan, 2018 to 2020 [Member] | Minimum [Member] | Scenario, Plan [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 5,000
Strategic Plan, 2018 to 2020 [Member] | Maximum [Member] | Scenario, Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Percentage Of Workforce Eliminated			3.00%
Restructuring and Related Cost, Expected Cost			$ 55,000
Earnings Per Share, Diluted			$ 0.27
Strategic Plan, 2018 to 2020 [Member] | Maximum [Member] | Scenario, Plan [Member] | Employee severance pay and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 45,000
Strategic Plan, 2018 to 2020 [Member] | Maximum [Member] | Scenario, Plan [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 10,000

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The expected percentage of the workforce to be eliminated as a result of restructuring activities.

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