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LONG-TERM DEBT AND FINANCE LEASE OBLIGATIONS - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 25, 2021 USD ($) | Mar. 27, 2021 USD ($) payment | Sep. 26, 2020 USD ($) | Sep. 25, 2021 USD ($) | Sep. 26, 2020 USD ($) | Jun. 26, 2021 USD ($) | Dec. 26, 2020 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 2.65% |  |  | 2.65% |  |  | 3.11% |  |
Deferred financing costs expensed |  |  |  |  | $ 38,253,000 | $ 0 |  |  |  |
Debt extinguishment and financing costs |  |  |  |  | $ 28,972,000 | 2,759,000 |  |  |  |
Number of consecutive fiscal quarters |  |  |  |  | 1 year |  |  |  |  |
Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative amount |  | $ 400,000,000 |  | $ 400,000,000 | $ 400,000,000 | 400,000,000 |  |  |  |
Term Loans |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Prepayments of long-term debt |  |  | $ 146,900,000 |  |  |  |  |  |  |
Deferred financing costs expensed |  |  | 200,000 |  |  |  |  |  |  |
Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Prepayments of long-term debt |  |  | 135,000,000 |  |  |  |  |  |  |
$750 Million Term Loan | Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility |  |  | $ 750,000,000 |  |  |  |  |  |  |
Number of quarterly installment payments | payment |  |  | 19 |  |  |  |  |  |  |
$2.05 Billion Credit Facility | Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum EBITDA less capital expenditures to consolidated cash interest expense ratio |  | 3.50 |  |  | 3.50 |  |  |  |  |
$2.05 Billion Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility |  |  | $ 2,050,000,000.00 |  |  |  |  |  |  |
5.5% Senior Notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Prepayments of long-term debt |  |  | 500,000,000 |  |  |  |  |  |  |
Deferred financing costs expensed |  |  | 5,000,000 |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 500,000,000
Stated interest rate |  | 5.50% |  |  | 5.50% |  |  | 5.50% |  | 5.50%
Debt extinguishment and financing costs |  |  | 21,000,000 |  |  |  |  |  |  |
Payments for accrued interest |  |  | 13,000,000 |  |  |  |  |  |  |
4.25% Senior Notes due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum consolidated indebtedness to consolidated EBITDA |  | 4.25 |  |  | 4.25 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 500,000,000 |
Stated interest rate |  | 4.25% |  |  | 4.25% |  |  | 4.25% | 4.25% |
3.75% Senior Notes due 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000 |  |  |  |  |  |  |
Stated interest rate |  | 3.75% | 3.75% |  | 3.75% |  |  | 3.75% |  |
4.0% Senior Notes due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000 |  |  |  |  |  |  |
Stated interest rate |  | 4.00% | 4.00% |  | 4.00% |  |  | 4.00% |  |
$3 Billion Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  | $ 3,000,000,000 |  |  |
$3 Billion Credit Facility | Credit Facility | Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate | 0.50% |  |  |  |  |  |  |  |  |
$3 Billion Credit Facility | Credit Facility | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate | 1.00% |  |  |  |  |  |  |  |  |
Senior Notes Due 2029 And 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Debt extinguishment and financing costs |  |  | 10,000,000 |  |  |  |  |  |  |
Senior Notes Due 2029 And 2031 | Senior Notes | Cognate BioServices, Inc. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt extinguishment and financing costs |  |  | 21,000,000 |  |  |  |  |  |  |
Payments for accrued interest |  |  | $ 13,000,000 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 16,700,000 |  |  | $ 16,700,000 |  |  | $ 16,000,000 |  |
Other Nonoperating Income (Expense) | Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency losses recognized |  |  |  |  | 22,700,000 | 4,200,000 |  |  |  |
Interest Expense | Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized gains from derivatives |  | $ 5,048,000 |  | $ 0 | $ 24,380,000 | $ 6,067,000 |  |  |  |

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