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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 05, 2020
Mar. 31, 2019
Dec. 29, 2019
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 652,396 $ 648,737  
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Asset, Net, Current 33,700   $ 37,000
Contract with Customer, Liability, Current 32,100   $ 29,900
Contract with Customer, Liability, Revenue Recognized (12,600)    
Unbilled Receivables Transferred To Accounts Receivables (14,900)    
Contract with Customer, Liability, Increase (Decrease) 14,800    
Contract with Customer, Asset, Increase (Decrease) 11,600    
Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 499,560 514,685  
Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 152,836 134,052  
Americas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 274,273 260,425  
Europe [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 200,256 173,464  
Asia [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 177,867 214,848  
Discovery & Analytical Solutions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 398,395 388,833  
Discovery & Analytical Solutions [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 267,907 275,438  
Discovery & Analytical Solutions [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 130,488 113,395  
Discovery & Analytical Solutions [Member] | Americas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 169,116 162,417  
Discovery & Analytical Solutions [Member] | Europe [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 118,657 107,606  
Discovery & Analytical Solutions [Member] | Asia [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 110,622 118,810  
Diagnostics [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 254,001 259,904  
Diagnostics [Member] | Transferred at Point in Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 231,653 239,247  
Diagnostics [Member] | Transferred over Time [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 22,348 20,657  
Diagnostics [Member] | Americas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 105,157 98,008  
Diagnostics [Member] | Europe [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 81,599 65,858  
Diagnostics [Member] | Asia [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 67,245 96,038  
Life Sciences [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 245,733 217,377  
Life Sciences [Member] | Discovery & Analytical Solutions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 245,733 217,377  
Life Sciences [Member] | Diagnostics [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 0  
Diagnostics [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 254,001 259,904  
Diagnostics [Member] | Discovery & Analytical Solutions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 0  
Diagnostics [Member] | Diagnostics [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 254,001 259,904  
Applied Markets [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 152,662 171,456  
Applied Markets [Member] | Discovery & Analytical Solutions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 152,662 171,456  
Applied Markets [Member] | Diagnostics [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 0