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Debt - Narrative (Details) | Jun. 05, 2024 | Sep. 19, 2022 USD ($) seniorNote | Sep. 12, 2022 USD ($) | Dec. 27, 2024 USD ($) | Mar. 29, 2024 USD ($) | Apr. 15, 2020 | Feb. 09, 2017 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, aggregate acquisition amount benchmark |  |  | $ 250,000,000 |  |  |  |
Total principal amount |  |  |  | $ 8,569,000,000 | $ 8,716,000,000 |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of debt instruments | seniorNote |  | 2 |  |  |  |  |
Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, consolidated leverage ratio |  |  | 5.25 |  |  |  |
Amended and Restated Credit Agreement | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.125% |  |  |  |
Amended and Restated Credit Agreement | Minimum | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.125% |  |  |  |
Amended and Restated Credit Agreement | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, consolidated leverage ratio |  |  | 5.75 |  |  |  |
Amended and Restated Credit Agreement | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.75% |  |  |  |
Amended and Restated Credit Agreement | Maximum | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |  |  |
Amended and Restated Credit Agreement | Weighted Average |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, consolidated leverage ratio |  |  | 6.0 |  |  |  |
5.00% Senior Notes due April 15, 2025 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total principal amount |  |  |  | $ 1,100,000,000 | 1,100,000,000 |  | $ 1,100,000,000
Stated interest rate |  |  |  | 5.00% |  | 5.00% | 5.00%
6.75% Senior Notes due September 30, 2027 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total principal amount |  |  |  | $ 900,000,000 | 900,000,000 |  |
Stated interest rate |  | 6.75% |  | 6.75% |  |  |
7.125% Senior Notes due September 30, 2030 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total principal amount |  |  |  | $ 600,000,000 | $ 600,000,000 |  |
Stated interest rate |  | 7.125% |  | 7.125% |  |  |
6.75% and 7.125% Senior Notes | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 1,500,000,000 |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  | $ 0 |  |  |
Term Loan Interim Facility A | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Quarterly installment payment (as a percent) |  |  | 1.25% |  |  |  |
Term Loan Interim Facility B | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  | 2.00% |  |  |  |
Quarterly installment payment (as a percent) |  |  | 0.25% |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit |  |  |  | $ 5,000,000 |  |  |
Avast plc | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 1,500,000,000 |  |  |  |
Avast plc | Term Loan Interim Facility A | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | 3,910,000,000 |  |  |  |
Avast plc | Term Loan Interim Facility B | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | 3,690,000,000 |  |  |  |
Avast plc | Bridge Loan | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 750,000,000 |  |  |  |

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