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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Commitment And Contingencies [Line Items]      
Inventory Recall Expense $ 13.0 $ 0.0  
Long-term Debt 6,133.6   $ 5,635.6
Spectrum Brands [Member]      
Commitment And Contingencies [Line Items]      
Inventory Write-down 11.9    
Spectrum Brands [Member]      
Commitment And Contingencies [Line Items]      
Environmental Costs Recognized, Capitalized 4.3   4.4
Product Liability Accrual, Component Amount 7.1   8.0
Product Warranty Accrual, Current 6.8   $ 7.5
Inventory Recall Expense 13.0    
FGL [Member]      
Commitment And Contingencies [Line Items]      
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset 2.1    
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability 2.1    
Expiration of partial amount of unfunded, legally binding lending commitments 180.2    
Cressy Plaintiff [Member] | FGL [Member]      
Commitment And Contingencies [Line Items]      
Litigation Settlement, Amount 1.3    
Loss Contingency Accrual, Provision 9.2    
Eddie L. Cressy v. Fidelity Guaranty [sic] Life Insurance Company, et. al. [Member] | FGL [Member]      
Commitment And Contingencies [Line Items]      
Legal Fees 6.0    
Litigation Settlement, Expense $ 3.2