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Segment Information - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | segment     3  
Impairment charges     $ 1,125 $ 0
Net sales | Geographic Concentration Risk | Other countries        
Segment Reporting Information [Line Items]        
Concentration risk (less than)     10.00%  
Other | Operating Income (Loss)        
Segment Reporting Information [Line Items]        
Acquisition related costs $ 11,200 $ 6,300 $ 79,400 8,200
Inventory adjustment   1,600 36,900 1,600
Legal, accounting and other expenses 2,500 4,800 16,300 6,600
Backlog amortization costs 3,100   8,700  
Share based compensation     4,500  
Restructuring charges 4,600 $ 1,500 9,400 $ 1,500
Impairment charges $ 1,000   3,600  
Other asset impairment charges     $ 1,100