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Receivables, net - Additional Information (Details) - Credit Concentration Risk [Member] | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of net sales from major customer | 15.10% | 15.20% | 14.70%
Percentage Of Accounts Receivable Major Customers | 14.00% | 15.10% |

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- Definition Percentage Of Accounts Receivable Major Customers + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage Of Net Sales Due To Customers + References No definition available. + Details
Name: | hrg_PercentageOfNetSalesDueToCustomers
Namespace Prefix: | hrg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | hrg_ConcentrationOfCreditRiskAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |