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Severance, Restructuring and Acquisition Integration Activities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | $ 4,045,000 | $ 11,688,000 | $ 10,904,000 | $ 57,010,000
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and integration cost payable period |  |  | 60 days |
Cost of Sales |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | 792,000 | 4,820,000 | $ 1,777,000 | 21,482,000
Selling, General and Administrative Expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | 3,253,000 | 6,341,000 | 8,364,000 | 30,287,000
Research and Development |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | 0 | 527,000 | 763,000 | 5,241,000
PPC Broadband and Opterna Integration Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | 3,100,000 |  | 5,600,000 |
Grass Valley And SAM Integration Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs | $ 0 | 7,100,000 | $ 3,000,000.0 | 36,600,000
Industrial Manufacturing Footprint Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance, restructuring, and acquisition integration costs |  | $ 4,300,000 |  | $ 15,800,000

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