v3.8.0.1
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Nov. 14, 2017
Mar. 31, 2017
Document Documentand Entity Information [Abstract]      
Document Type 8-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2017    
Entity Public Float     $ 2,287.0
Document Fiscal Year Focus 2017    
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 Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   200,624,864