Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 05, 2021
Entity Addresses [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	0-25965
Entity Registrant Name	ZIFF DAVIS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1053457
Entity Address, Address Line One	114 5th Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10011
City Area Code	212
Local Phone Number	503-3500
Entity Information, Former Legal or Registered Name	J2 Global, Inc.
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	ZD
Security Exchange Name	NASDAQ
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		48,220,791
Entity Central Index Key	0001084048
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Former Address
Entity Addresses [Line Items]
Entity Address, Address Line One	700 S. Flower Street
Entity Address, Address Line Two	15th Floor
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90017