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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Apr. 01, 2012 | Mar. 31, 2013 | Apr. 01, 2012
Related Party Transaction [Line Items] |  |  |  |
Services Agreement advance written notice period for termination |  |  | 30 days |
Expenses related to Services Agreement | $ 0.8 |  | $ 1.0 |
Reimbursement of Harbinger Capital expenses |  | 0.6 |  | 1.3
Secondary offering, shares |  |  | 23,000,000 |
Registration Rights Agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Secondary offering, shares |  |  |  | 23,000,000
Offering cost incurred by company |  |  |  | $ 0.4

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- Definition Common Stock Offering Issuance Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Related Party Transaction Agreement Prior Written Notice Period For Termination Of Agreement + References No definition available. + Details
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- Definition Related Party Transaction Expenses + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Secondary Offering Of Common Stock + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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- Details
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- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
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