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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