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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 |  |  |  |

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