v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Sep. 30, 2013
Dec. 12, 2013
Document And Entity Information [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Sep. 30, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus FY  
Trading Symbol wmg  
Entity Registrant Name Warner Music Group Corp.  
Entity Central Index Key 0001319161  
Current Fiscal Year End Date --09-30  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status No  
Entity Voluntary Filers Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   1,055
Entity Public Float $ 0