XML 13 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover Page - shares
 9 Months Ended
Sep. 30, 2025
Oct. 27, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-36097  
Entity Registrant Name GANNETT CO., INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 38-3910250  
Entity Address, Address Line One 175 Sully's Trail  
Entity Address, Address Line Two Suite 203  
Entity Address, City or Town Pittsford,  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 14534-4560  
City Area Code 585  
Local Phone Number 598-0030  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol GCI  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock Shares Outstanding   147,108,750
Entity Central Index Key 0001579684  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31