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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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