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Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	6 Months Ended
	Mar. 31, 2016 USD ($)
Front Street Future Policyholder Benefits Reserve [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change In Fair Value Of Derivatives	$ 7.0

X

- Definition

Change in fair value of derivatives.

+ References

No definition available.

+ Details

Name:	hrg_ChangeInFairValueOfDerivatives
Namespace Prefix:	hrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=hrg_FrontStreetFuturePolicyholderBenefitsReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: