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Non-current Bank Credit Lines and Loan Facilities - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 29, 2021 | Sep. 27, 2021 | Jul. 01, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total financing costs |  |  |  |  |  |  |  | $ 229,731 | $ 182,423 | $ 13,019
Cash paid for interest |  |  |  |  |  |  |  | 210,918 | 106,205 | $ 13,062
Long-term debt at fair value |  |  |  |  |  |  |  | 4,650,300 | 5,507,200 |
PRA Health Sciences, Inc |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total financing costs |  |  |  |  |  |  |  | $ 17,700 | $ 86,700 |
Senior Secured Term Loan | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 0.50% |  |
Senior Secured Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  | 2.25% |  |  |
Senior secured revolving loan facility | Variable rate component one | Base rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 0.60% |  |
Senior secured revolving loan facility | Variable rate component one | Base rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 1.00% |  |
Senior secured revolving loan facility | Variable rate component one | Base rate | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 0.25% |  |
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 1.60% |  |
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 2.00% |  |
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  | 1.25% |  |
Credit Facilities: | Senior secured credit facility and senior secured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount paid |  |  |  |  |  |  | $ 27,600 |  |  |
Credit Facilities: | Senior Secured Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 5,515,000 |  |  |
Debt instrument, interest rate (in percent) |  |  |  |  |  |  | 1.00% | 7.092% | 2.75% |
Repayments of senior debt | $ 200,000 | $ 200,000 | $ 100,000 | $ 300,000 | $ 500,000 | $ 13,800 |  |  |  |
Cash paid for interest | 66,100 | 53,600 | 39,400 | 35,100 | 40,800 | $ 40,400 |  |  |  |
Payments of debt restructuring costs | $ 1,800 | $ 1,900 | $ 900 | $ 3,200 | $ 5,600 |  |  |  |  |
Credit Facilities: | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  | $ 300,000 |  |
Line of credit | Senior secured revolving loan facility | Revolving loan facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 300,000 |  |  |
Senior Secured Notes | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 500,000 |  |  |
Debt instrument, interest rate (in percent) |  |  |  |  |  |  | 2.875% | 2.875% | 2.875% |

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