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Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2015 | Oct. 31, 2014 | Nov. 03, 2014 | Oct. 01, 2014 | Sep. 30, 2014 | Oct. 06, 2014 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |  |  |
Goodwill | $ 1,543.0 us-gaap_Goodwill | 1,543.0 us-gaap_Goodwill |  |  |  | $ 1,524.8 us-gaap_Goodwill |  |
Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 20 years |  |  |  |  |  |
Trade Names [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year |  |  |  |  |  |
Trade Names [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 12 years |  |  |  |  |  |
Technology assets [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 4 years |  |  |  |  |  |
Technology assets [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 17 years |  |  |  |  |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 15 years |  |  |  |  |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 20 years |  |  |  |  |  |
Compass Production Partners [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  | 141.2 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Proved Developed and Undeveloped Oil and Natural Gas Properties, Period Increase (Decrease) |  |  | 145.4 hrg_ProvedDevelopedandUndevelopedOilandNaturalGasPropertiesPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Current |  |  | 56.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
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 and Liabilities Assumed, Unproved Oil and Natural Gas Properties |  |  | 26.3 hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedUnprovedOilAndNaturalGasProperties / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Proved Developed and Undeveloped Oil and Natural Gas Properties |  |  | 767.5 hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedProvedDevelopedAndUndevelopedOilAndNaturalGasProperties / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | 23.2 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  |  | 1.0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = hrg_CompassProductionPartnersMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations |  |  | 36.0 hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetRetirementObligations / 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 |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | 17.9 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hrg_AbilityReMember |  |  |  |
General Partner [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  | 100.00%hrg_BusinessAcquisitionPercentageOfEquityInterestsAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
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 |  |  |
Goodwill |  |  |  |  | 7.1 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember |  |  | 116.0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember
Tell Manufacturing [Member] | Trade Names [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | 4.0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Tell Manufacturing [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Retention Rate |  |  |  |  | 90.00%hrg_RetentionRate / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 38.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Business Acquisition Contingent Consideration Key Assumptions Discount Rate |  | 20.00%hrg_BusinessAcquisitionContingentConsiderationKeyAssumptionsDiscountRate / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |  |
Acquired Finite-lived Intangible Asset, Residual Value |  |  |  |  | $ 8.5 us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 13 years |  |  |
Tell Manufacturing [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  | 2.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Tell Manufacturing [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  |  |  | 7.10%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Cost Approach Valuation Technique [Member] | Tell Manufacturing [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total |  |  |  |  | 97.00%hrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantandEquipmentMeasurementBasisPercentageofTotal / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / hrg_FairValueByValuationTechniqueAxis = us-gaap_CostApproachValuationTechniqueMember |  |  |
Market Approach Valuation Technique [Member] | Tell Manufacturing [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total |  |  |  |  | 3.00%hrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantandEquipmentMeasurementBasisPercentageofTotal / us-gaap_BusinessAcquisitionAxis = hrg_TellManufacturingMember / hrg_FairValueByValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Proved Developed and Undeveloped Oil and Natural Gas Properties + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unproved Oil and Natural Gas Properties + References No definition available. + Details
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- Definition The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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