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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items] |  |
Document Period End Date | Jun. 30, 2014 |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | $ 731.0 | $ 565.6
Doubtful [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 0 | 0
Substandard [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 252.4 | 222.0
Special Mention [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 302.1 | 36.7
Pass [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | $ 176.5 | $ 306.9

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- 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
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- Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Asset Backed Loans And Other Invested Assets Gross + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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