v3.19.3.a.u2
Document and Entity Information
Jan. 13, 2020
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0000935036
Document Type 8-K
Document Period End Date Jan. 13, 2020
Entity Registrant Name ACI WORLDWIDE, INC.
Entity Incorporation State Country Code DE
Entity File Number 0-25346
Entity Tax Identification Number 47-0772104
Entity Address, Address Line One 3520 Kraft Rd
Entity Address, Address Line Two Suite 300
Entity Address, City or Town Naples
Entity Address, State or Province FL
Entity Address, Postal Zip Code 34105
City Area Code (239)
Local Phone Number 403-4600
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.005 par value
Trading Symbol ACIW
Security Exchange Name NASDAQ
Entity Emerging Growth Company false