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Earnings Per Share - SBH (Schedule Of Weighted Average Shares) (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 13, 2018
USD ($)
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Basic          
Basic, weighted average shares   32.7 32.3 32.5 32.2
Diluted          
Diluted, weighted average shares   32.8 32.3 32.7 32.2
Increase in total outstanding shares       20.6  
Subsequent Event [Member]          
Diluted          
Upward adjustment | $ $ 200.0        
HRG [Member]          
Basic          
Basic, weighted average shares   203.0 200.4 201.8 199.8
Basic, share conversion at 1 to 0.1613   32.7 32.3 32.5 32.2
Diluted          
Diluted, weighted average shares   203.3 202.6 202.7 202.4
Diluted, share conversion at 1 to 0.1613   32.8 32.6 32.7 32.6
HRG [Member] | Subsequent Event [Member]          
Diluted          
Net indebtedness and transaction expenses | $ $ 328.2        
HRG [Member] | HRG Common Stock [Member] | Subsequent Event [Member]          
Diluted          
Reverse stock split conversion 0.1613