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Pensions and other postretirement benefit plans - Narrative (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2022 USD ($) insurer | Jul. 31, 2024 | Oct. 31, 2022 | Dec. 31, 2024 USD ($) plan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2024 USD ($) | Jan. 01, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Accumulated pension benefit obligations |  |  |  | $ 1,500,000 | $ 1,700,000 |  |  |
Net periodic expense (benefit) |  |  |  | $ (11,400) | (8,000) | $ (57,100) |  |
Decrease in net unfunded pension obligations |  |  |  |  |  | 99,900 |  |
Decrease in benefit obligation due to remeasurement |  |  |  |  |  | $ 281,800 |  |
Weighted average discount rate |  |  |  |  |  | 5.05% |  | 2.95%
Incremental decrease in plan assets |  |  |  |  |  | $ 381,700 |  |
Number of multiemployer pension plans | plan |  |  |  | 6 |  |  |  |
Other current and non-current liabilities, withdrawal liabilities for multi-employer pension plans |  |  |  | $ 55,600 |  |  |  |
Penalties amortization period |  |  |  | 13 years 10 months 24 days |  |  |  |
Withdrawal liability expense |  |  |  | $ 24,500 |  |  |  |
Maximum annual contributions per employee, percent |  |  |  | 75.00% |  |  |  |
Compensation expense related to 401(k) contributions |  |  |  | $ 3,300 | 800 | 13,500 |  |
First 4% of employee contributions |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Employer matching contribution, percent of match |  |  | 100.00% |  |  |  |  |
Contributions per employee subject to employer match (as a percent) |  |  | 4.00% |  |  |  |  |
Next 2% of employee contributions |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Employer matching contribution, percent of match |  |  | 50.00% |  |  |  |  |
Contributions per employee subject to employer match (as a percent) |  |  | 2.00% |  |  |  |  |
First 4% of employee contributions |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Employer matching contribution, percent of match |  | 25.00% |  |  |  |  |  |
Contributions per employee subject to employer match (as a percent) |  | 4.00% |  |  |  |  |  |
Pension benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Net periodic expense (benefit) |  |  |  | $ (11,079) | $ (7,291) | (58,380) |  |
Weighted average discount rate |  |  |  | 5.70% | 5.10% |  |  |
Incremental decrease in plan assets |  |  |  | $ (5,620) | $ (150,371) |  |  |
Contribution to the defined benefit plans |  |  |  | 7,949 | $ 1,441 |  |  |
Other Postretirement Benefits Plan |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Contribution to the defined benefit plans |  |  |  | 4,600 |  |  |  |
Pension Plan and Postemployment Retirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Employer contributions expected to be paid during the next fiscal year |  |  |  | $ 6,600 |  |  |  |
Plans in Red Zone |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Percentage of plans funded |  |  |  | 65.00% |  |  |  |
Plans in Orange Zone |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Percentage of plans funded |  |  |  | 80.00% |  |  |  |
Plans in Green Zone |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Percentage of plans funded |  |  |  | 80.00% |  |  |  |
Gannett Retirement Plan |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Defined benefit plan required funding status |  |  |  |  |  |  | 100.00% |
Expected future employer contributions, quarterly certification funding requirement |  |  |  |  |  |  | $ 1,000 |
Defined benefit plan, expected future employee contributions, quarterly certification funding requirement term |  |  |  |  |  |  | 60 days |
Current funding status, percentage |  |  |  | 100.00% |  |  |  |
Gannett Retirement Plan | Pension benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Number of insurance companies, assets used to purchase annuities | insurer | 2 |  |  |  |  |  |  |
Transfer of pension liability | $ 450,000 |  |  |  |  |  |  |
Pension settlement gain |  |  |  |  |  | 700 |  |
Noncash pension settlement gain, after tax |  |  |  |  |  | $ 500 |  |
Multiemployer Plans |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Expected funding deficiency term |  |  |  | 6 years |  |  |  |

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