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Restructuring and related charges - Summarization of Remaining Accrual Balance Associated with Initiatives and Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Restructuring Reserve [Roll Forward]
Non-Cash Items	$ (20.1)	$ (9.2)

X

- Definition

Total amount of non-cash restructuring, and related charges.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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