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Related Party Transactions Addtional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]        
Common stock, shares, issued     200,789,100 201,383,800
Document Period End Date Mar. 31, 2018      
Long-term debt $ 5,404.2 $ 5,801.9    
Jefferies [Member]        
Related Party Transaction [Line Items]        
Investment Advisory, Management and Administrative Fees 3.0      
Fees and Commissions $ 1.0      
Five Point Seven Five Percent Senior Notes Due July 15 2025 [Member] | Spectrum Brands [Member]        
Related Party Transaction [Line Items]        
Long-term debt, interest rate 5.80% 5.80%    
Long-term debt $ 1,000.0 $ 1,000.0    
7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member] | HGI        
Related Party Transaction [Line Items]        
Long-term debt, interest rate 0.00% 7.875%    
Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] | Spectrum Brands [Member]        
Related Party Transaction [Line Items]        
Long-term debt, interest rate 4.00%      
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | HGI        
Related Party Transaction [Line Items]        
Long-term debt, interest rate 7.75% 7.75%    
Long-term debt   $ 890.0