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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Nov. 16, 2015
Mar. 31, 2015
Document Documentand Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2015    
Entity Public Float     $ 1,398.8
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol HRG    
Entity Registrant Name HRG GROUP, INC.    
Entity Central Index Key 0000109177    
Current Fiscal Year End Date --09-30    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   201,397,256