Earnings Per Share - SBH (Narrative) (Details) shares in Millions, $ in Millions		9 Months Ended
Jul. 13, 2018 USD ($)	Jun. 30, 2019 shares
Upward adjustment	$ 200.0
Increase in total outstanding shares \| shares		20.6
HRG [Member]
Net indebtedness and transaction expenses	328.2
Upward adjustment	$ 200.0
HRG [Member] \| HRG Common Stock [Member]
Reverse stock split conversion	0.1613

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration