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Consolidating Financial Information Additional information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2017 USD ($)
Document Period End Date	Dec. 31, 2017
Asset Management segment [Member]
Fair Value, Net Asset (Liability)	$ 67.6

X

- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

+ References

No definition available.

+ Details

Name:	dei_DocumentPeriodEndDate
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of asset after deduction of liability.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueNetAssetLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=hrg_AssetManagementsegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: