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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2015 Segment | Mar. 31, 2014 | Oct. 31, 2014 | Nov. 03, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Oct. 01, 2014 | Oct. 06, 2014 | Jan. 16, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends and accretion | $ 12.1 us-gaap_PreferredStockDividendsAndOtherAdjustments |  |  | $ 24.3 us-gaap_PreferredStockDividendsAndOtherAdjustments |  |  |  |  |  |  |  |
Long-term debt |  | 5,658.3 us-gaap_LongTermDebt |  |  |  |  | 5,194.5 us-gaap_LongTermDebt |  |  |  |  |
Goodwill |  | 1,543.0 us-gaap_Goodwill |  |  |  |  | 1,524.8 us-gaap_Goodwill |  |  |  |  |
Stock Repurchased During Period, Shares |  | 1.7 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Equity |  | 22.2 us-gaap_PaymentsForRepurchaseOfEquity |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | 100.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | 100.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 12.3 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |  |  |  |  |  |  |
Asset-based loans |  | 660.2 hrg_FinancingReceivableHeldForInvestment |  |  |  |  | 811.6 hrg_FinancingReceivableHeldForInvestment |  |  |  |  |
Number of reporting segments |  | 4 us-gaap_NumberOfReportableSegments |  |  |  |  |  |  |  |  |  |
Compass Production Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 118.8 us-gaap_BusinessCombinationConsiderationTransferred1 / dei_LegalEntityAxis = hrg_CompassProductionPartnersMember |  |  | 118.8 us-gaap_BusinessCombinationConsiderationTransferred1 / dei_LegalEntityAxis = hrg_CompassProductionPartnersMember |  |  |  |  |  |  |
FGLH [Member] | 6.375% Senior Notes, Due April 1, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 6.40%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFivePercentSeniorNotesDueApril12021Member |  |  |  |  | 6.40%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFivePercentSeniorNotesDueApril12021Member |  |  |  |  |
Long-term debt |  | 300.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFivePercentSeniorNotesDueApril12021Member |  |  |  |  | 300.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFivePercentSeniorNotesDueApril12021Member |  |  |  |  |
Spectrum Brands [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 41.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = hrg_SpectrumBrandsMember |  |  |  |  |  |  |  |  |  |
Spectrum Brands [Member] | Six Point One Two Five Percentage Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 6.125%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointOneTwoFivePercentageSeniorNotesMember |  |  |  |  | 0.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointOneTwoFivePercentageSeniorNotesMember |  |  |  |  |
Long-term debt |  | 250.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointOneTwoFivePercentageSeniorNotesMember |  |  |  |  | 0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointOneTwoFivePercentageSeniorNotesMember |  |  |  |  |
Spectrum Brands [Member] | 6.75% Senior Notes, due March 15, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 6.75%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSevenFivePercentageSeniorNotesMember |  |  |  |  | 6.80%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSevenFivePercentageSeniorNotesMember |  |  |  |  |
Long-term debt |  | 300.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSevenFivePercentageSeniorNotesMember |  |  |  |  | 300.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSevenFivePercentageSeniorNotesMember |  |  |  |  |
Spectrum Brands [Member] | Term Loan Due September 4, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 3.10%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueSeptember42017Member | [1] |  |  |  | 3.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueSeptember42017Member | [1] |  |  |  |
Long-term debt |  | 635.2 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueSeptember42017Member | [1] |  |  |  | 648.4 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueSeptember42017Member | [1] |  |  |  |
Spectrum Brands [Member] | Six Point Three Seven Five Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 6.375%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFiveSeniorNotesMember |  |  |  |  | 6.40%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFiveSeniorNotesMember |  |  |  |  |
Long-term debt |  | 520.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFiveSeniorNotesMember |  |  |  |  | 520.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointThreeSevenFiveSeniorNotesMember |  |  |  |  |
Spectrum Brands [Member] | 6.625% Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 6.625%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSixTwoFivePercentNotesMember |  |  |  |  | 6.60%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSixTwoFivePercentNotesMember |  |  |  |  |
Long-term debt |  | 570.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSixTwoFivePercentNotesMember |  |  |  |  | 570.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_SixPointSixTwoFivePercentNotesMember |  |  |  |  |
Spectrum Brands [Member] | Term Loan Due December 17, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | 30.5 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueDecember172019Member | [1] |  |  |  |  |  |  |  |  |
HGI [Member] | 7.875% Senior Secured Notes, due July 15, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 7.90%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointEightSevenFivePercentSeniorNotesMember |  |  |  |  | 7.90%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointEightSevenFivePercentSeniorNotesMember |  |  |  |  |
Long-term debt |  | 604.4 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointEightSevenFivePercentSeniorNotesMember |  |  |  |  | 604.4 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointEightSevenFivePercentSeniorNotesMember |  |  |  |  |
HGI [Member] | Seven Point Seven Five Percent Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 7.80%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointSevenFivePercentSeniorUnsecuredNotesMember |  |  |  |  | 7.80%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointSevenFivePercentSeniorUnsecuredNotesMember |  |  |  |  |
Long-term debt |  | 750.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointSevenFivePercentSeniorUnsecuredNotesMember |  |  |  |  | 750.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = hrg_SevenPointSevenFivePercentSeniorUnsecuredNotesMember |  |  |  |  |
FGL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 19.30%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = hrg_FglMember |  |  |  |  |  |  |  |  |  |
Tell Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  | 30.3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  | 12.5 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember |  |
Goodwill |  |  |  |  |  |  |  |  | 116.0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember | 7.1 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember |  |
Compass Production Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  | 99.80%hrg_BusinessAcquisitionPercentageOfEquityInterestsAcquired / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |  | 25.50%hrg_BusinessAcquisitionPercentageOfEquityInterestsAcquired / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest |  |  |  |  | 465.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |  |  |
Ability Re [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  | 19.2 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hrg_AbilityReMember |  |  |  |  |  |
European IAMS and Eukanuba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  | 40.5 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = hrg_EuropeanIAMSandEukanubaMember |  |  |
Goodwill |  |  |  |  |  |  |  |  | 1.7 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_EuropeanIAMSandEukanubaMember |  |  |
Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  | 148.0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hrg_SalixAnimalHealthLLCMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  | 58.5 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = hrg_SalixAnimalHealthLLCMember
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 68.8 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_SalixAnimalHealthLLCMember
Severance Cost, one time payments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs |  | 20.5 us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostonetimepaymentsMember |  |  |  |  |  |  |  |  |  |
Severance Cost, Accrued Bonus [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs |  | 16.5 us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostAccruedBonusMember |  |  |  |  |  |  |  |  |  |
Severance Cost, Future Bonus [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs |  | 3.3 us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostFutureBonusMember |  |  |  |  |  |  |  |  |  |
Euro Member Countries, Euro | Spectrum Brands [Member] | Euro Term Loan, Due September 4, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 3.80%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_EuroTermLoanDueSeptember42019Member | [1] |  |  |  | 3.80%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_EuroTermLoanDueSeptember42019Member | [1] |  |  |  |
Long-term debt |  | 242.5 us-gaap_LongTermDebt / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_EuroTermLoanDueSeptember42019Member | [1] |  |  |  | 283.3 us-gaap_LongTermDebt / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_EuroTermLoanDueSeptember42019Member | [1] |  |  |  |
Euro Member Countries, Euro | Spectrum Brands [Member] | Term Loan Due December 19, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 150.0 us-gaap_LongTermDebt / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = hrg_SpectrumBrandsMember / us-gaap_LongtermDebtTypeAxis = hrg_TermLoanDueDecember192021Member |  |  |  |  |  |  |  |  |  |
[1] | *Together, defined as the "Term Loan"

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