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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
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Restructuring Reserve [Roll Forward] |  |  |
Non-Cash Items | $ (6.4) | $ (20.1) | $ (9.2)

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- 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

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- 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