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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Income Taxes [Line Items]      
Document Period End Date Dec. 31, 2017    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%  
Income tax (benefit) expense $ (126.0) $ 5.6  
Deferred income taxes $ (127.1) $ 18.5  
Effective Income Tax Rate Reconciliation, Percent 263.00% (15.40%)  
U S Federal [Member]      
Income Taxes [Line Items]      
Operating Loss Carryforwards $ 387.9    
HGI      
Income Taxes [Line Items]      
Deferred Tax Assets, Valuation Allowance 430.8   $ 703.2
HGI | U S Federal [Member]      
Income Taxes [Line Items]      
Operating Loss Carryforwards 1,565.1   1,524.3
Capital Loss Carryforwards 423.1   315.9
FGL [Member]      
Income Taxes [Line Items]      
Deferred Tax Assets, Valuation Allowance 34.4   58.1
FGL [Member] | U S Federal [Member]      
Income Taxes [Line Items]      
Operating Loss Carryforwards 149.1   151.1
FGL [Member] | Domestic Tax Authority [Member]      
Income Taxes [Line Items]      
Capital Loss Carryforwards 15.0   $ 15.0
H G I [Member]      
Income Taxes [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 287.2    
Spectrum Brands [Member]      
Income Taxes [Line Items]      
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount 623.1    
Undistributed Earnings of Foreign Subsidiaries 1.0    
Spectrum Brands [Member] | Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member]      
Income Taxes [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 78.8    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount 78.8    
Spectrum Brands [Member] | Deferred Tax Assets, Valuation Allowance, US State and Local Income Taxes [Member]      
Income Taxes [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 41.4    
Income tax (benefit) expense $ 206.7