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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 9 Months Ended
Jan. 07, 2015
Jun. 30, 2015
Sep. 30, 2014
Apr. 06, 2011
Commitment And Contingencies [Line Items]        
Contractual Obligation   $ 215,400,000    
Reserves for legal, environmental and regulatory matters   $ 12,800,000    
Document Period End Date   Jun. 30, 2015    
Long-term Debt   $ 6,860,300,000 $ 5,194,500,000  
Notional amount of unfunded, legally binding lending commitments   168,100,000    
Expiration of partial amount of unfunded, legally binding lending commitments   $ 98,000,000    
Maximum [Member]        
Commitment And Contingencies [Line Items]        
Expiry date of partial amount of notional amount   1 year    
Expiry date of remainder part of notional amount   5 years    
Minimum [Member]        
Commitment And Contingencies [Line Items]        
Expiry date of remainder part of notional amount   1 year    
Fidelity And Guaranty Life Holdings [Member]        
Commitment And Contingencies [Line Items]        
Business Acquisition Fair Value Of Contingent Purchase Price Consideration Reduction       $ 50,000,000
Accrued amount of guaranty fund assessments   $ 3,800,000    
Estimated future premium tax deductions   3,900,000    
Spectrum Brands [Member]        
Commitment And Contingencies [Line Items]        
Environmental costs recognized, capitalized   4,500,000    
OMGUK CARVM financing fee [Member]        
Commitment And Contingencies [Line Items]        
Reserves for legal, environmental and regulatory matters   5,900,000    
Legal Fees   7,600,000    
HRG v OMGUK [Member]        
Commitment And Contingencies [Line Items]        
Litigation Settlement, Amount   61.6    
Cressy Plaintiff [Member]        
Commitment And Contingencies [Line Items]        
Loss Contingency, Receivable   3,600,000    
Litigation Settlement, Amount   5,300,000    
Loss Contingency Accrual, Provision   8,600,000    
Estimated Litigation Liability   2,700,000    
Eddie L. Cressy v. Fidelity Guaranty [sic] Life Insurance Company, et. al. [Member]        
Commitment And Contingencies [Line Items]        
Legal Fees   3,900,000    
Payments for Legal Settlements   2,000,000    
Dale R. Ludwick, on behalf of Herself and All Others Similarly Situated v. Harbinger Group Inc., Fidelity & Guaranty Life Insurance Company, Raven Reinsurance Company, and Front Street Re (Cayman) Ltd [Member]        
Commitment And Contingencies [Line Items]        
Loss Contingency, Damages Sought, Value $ 0      
Estimated Litigation Liability   900,000    
Unasserted Claim [Member] | Fidelity And Guaranty Life Holdings [Member]        
Commitment And Contingencies [Line Items]        
Administrative costs and potential liabilities   1,800,000    
Loss Contingency Accrual, Payments   1.7    
Radioshack [Member] | Salus Capital Partners L L C [Member]        
Commitment And Contingencies [Line Items]        
Long-term Debt   250,000,000    
Revolving Loan Facility   585,000,000    
Proposed Settlement [Member] | Kahn v. Philip A. Falcone et al [Member]        
Commitment And Contingencies [Line Items]        
Litigation Settlement, Amount   3.8    
Fixed Income Securities [Member]        
Commitment And Contingencies [Line Items]        
Contractual Obligation   35,000,000    
Other Invested Assets [Member]        
Commitment And Contingencies [Line Items]        
Contractual Obligation   156,600,000    
Other assets [Member]        
Commitment And Contingencies [Line Items]        
Contractual Obligation   $ 23,800,000