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Severance, Restructuring and Acquisition Integration Activities - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 27 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Apr. 01, 2018
Restructuring Cost and Reserve [Line Items]      
Severance, restructuring, and acquisition integration costs $ 20,394 $ 6,600  
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 $ 9,400 5,900  
Selling, General and Administrative Expenses      
Restructuring Cost and Reserve [Line Items]      
Severance, restructuring, and acquisition integration costs 9,400 700  
Research and Development      
Restructuring Cost and Reserve [Line Items]      
Severance, restructuring, and acquisition integration costs 1,600 0  
Grass Valley And SAM Integration Program [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance, restructuring, and acquisition integration costs 9,200    
Additional severance and restructuring costs 41,000   $ 41,000
Expected savings from the restructuring program 44,000    
Industrial Manufacturing Footprint Program      
Restructuring Cost and Reserve [Line Items]      
Severance, restructuring, and acquisition integration costs 7,500 $ 5,700 $ 55,900
Expected savings from the restructuring program $ 13,000