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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 |

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