Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
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	7950 Jones Branch Drive,
Entity Address, City or Town	McLean,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22107-0910
City Area Code	703
Local Phone Number	854-6000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		137,959,262
Entity Central Index Key	0001579684
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Common stock
Entity Information
Title of Each Class	Common Stock, par value $0.01 per share
Trading Symbol	GCI
Name of Each Exchange on Which Registered	NYSE
Preferred Stock Purchase Rights
Entity Information
Title of Each Class	Preferred Stock Purchase Rights
Name of Each Exchange on Which Registered	NYSE
No Trading Symbol	true