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Cover
 12 Months Ended
Sep. 30, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Sep. 30, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Registrant Name AMDOCS LIMITED
Entity Central Index Key 0001062579
Current Fiscal Year End Date --09-30
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Incorporation, State or Country Code Y7
Entity Address, Address Line One Hirzel House
Entity Address, Address Line Two Smith Street
Entity Address, City or Town St. Peter Port
Entity Address Country GG
Entity Address, Postal Zip Code GY1 2NG
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Security Exchange Name NASDAQ
Security 12(b) Title Ordinary Shares, par value £0.01
Trading Symbol DOX
Entity Common Stock, Shares Outstanding 131,535,692
Entity File Number 1-14840
Document Accounting Standard U.S. GAAP
ICFR Auditor Attestation Flag false
Contact Phone [Member]  
Document Information [Line Items]  
City Area Code 314
Local Phone Number 212-8328
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Matthew E. Smith
Entity Address, Address Line One 1390 Timberlake Manor Parkway
Entity Address, City or Town Chesterfield
Entity Address, State or Province MO
Entity Address, Postal Zip Code 63017
Contact Personnel Email Address dox_info@amdocs.com