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Fair Value Measurements (Narrative) (Details)
$ in Thousands, € in Millions
9 Months Ended
Sep. 28, 2025
USD ($)
Sep. 29, 2024
USD ($)
Sep. 28, 2025
EUR (€)
Jun. 29, 2025
USD ($)
Dec. 29, 2024
USD ($)
Dec. 29, 2024
EUR (€)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 13, 2023
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 19,156 $ 31,085   $ 21,090 $ 21,753   $ 30,540 $ 40,005  
Unamortized Debt Issuance Expense 17,472                
Debt Instrument, Unamortized Discount (2,906)                
Payment for Contingent Consideration Liability, Financing Activities 3,838 $ 8,832              
Analytical, Food and Enterprise Services businesses [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Disposal Group, Consideration, Contingent on Exit Valuation                 $ 150,000
2.55 Percent Senior Unsecured Notes due in 2031 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Unamortized Debt Issuance Expense 2,018                
Debt Instrument, Unamortized Discount (77)                
3.625 Percent Senior Unsecured Notes due in 2051 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Unamortized Debt Issuance Expense 3,966                
Debt Instrument, Unamortized Discount (3)                
1.875 Percent Ten Year Senior Unsecured Notes [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Unamortized Debt Issuance Expense 404                
Debt Instrument, Unamortized Discount (492)                
3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Unamortized Debt Issuance Expense 3,390                
Debt Instrument, Unamortized Discount (1,224)                
Quoted Prices In Active Markets (Level 1) [Member] | Fair Value, Recurring [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0       0        
Significant Other Observable Inputs (Level 2) [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Long-term Debt 2,630,693                
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Recurring [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0       0        
Significant Other Observable Inputs (Level 2) [Member] | 2.55 Percent Senior Unsecured Notes due in 2031 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Long-term Debt 397,905                
Significant Other Observable Inputs (Level 2) [Member] | 3.625 Percent Senior Unsecured Notes due in 2051 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Long-term Debt 396,031                
Significant Other Observable Inputs (Level 2) [Member] | 3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Long-term Debt 845,386                
Significant Other Observable Inputs (Level 2) [Member] | Senior Unsecured Notes [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Long-term Debt 3,217,200       3,151,500        
Unsecured senior notes, fair value 2,940,300       2,765,500        
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Facilities, including the senior revolving credit facility [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Other Long-term Debt | €     € 0.4     € 0.5      
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Recurring [Member]                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 19,156       $ 21,753