XML 11 R1.htm IDEA: XBRL DOCUMENT v3.23.3
Cover Page - shares
9 Months Ended
Sep. 30, 2023
Oct. 31, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 0-25346  
Entity Registrant Name ACI WORLDWIDE, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-0772104  
Entity Address, Address Line One 2811 Ponce de Leon Blvd  
Entity Address, Address Line Two PH 1  
Entity Address, City or Town Coral Gables,  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33134  
City Area Code 305  
Local Phone Number 894-2200  
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   108,722,535
Title of 12(b) Security Common Stock, $0.005 par value  
Trading Symbol ACIW  
Security Exchange Name NASDAQ  
Amendment Flag false  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000935036  
Current Fiscal Year End Date --12-31