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Stock Compensation - Summary of Restricted Stock and Restricted Stock Units Outstanding and Related Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Document Fiscal Year Focus     2017    
HGI [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     $ 2,300,000 $ 1,600,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 2.1   $ 2.1    
Weighted Average Grant Date Fair Value (in dollars per share):          
Exercised/Released     $ 29,800,000 $ 30,300,000  
HGI [Member] | Restricted stock awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     $ 15.71    
Shares:          
Restricted award outstanding at September 30, 2012     1,975    
Exercised/Released     1,832    
Restricted award outstanding at March 31, 2013 168   168    
Weighted Average Grant Date Fair Value (in dollars per share):          
Exercised/Released     $ 12.69    
Restricted award expected to vest $ 13.72   $ 13.72   $ 12.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     25 99  
HGI [Member] | Restricted stock units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 0.00    
Shares:          
Restricted award outstanding at September 30, 2012     42    
Exercised/Released     42    
Weighted Average Grant Date Fair Value (in dollars per share):          
Restricted award outstanding at September 30, 2012     $ 12.33    
Exercised/Released     $ 12.33    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     0 6  
HGI [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     318 28  
Weighted Average Grant Date Fair Value (in dollars per share):          
Restricted award expected to vest $ 3.89   $ 3.89    
Spectrum Brands [Member] | Performance-based and Time-based Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross     397    
Spectrum Brands [Member] | Restricted stock units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     $ 126.96    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 43.9 $ 40.2 $ 43.9 $ 40.2  
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 87.5 $ 54.2  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (7)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 116.13    
Shares:          
Restricted award outstanding at September 30, 2012     577    
Exercised/Released     491    
Restricted award outstanding at March 31, 2013 769   769    
Weighted Average Grant Date Fair Value (in dollars per share):          
Restricted award outstanding at September 30, 2012     $ 94.97    
Exercised/Released     109.09    
Restricted award expected to vest $ 114.46   $ 114.46    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     690    
Spectrum Brands [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted 2   690    
Weighted Average Grant Date Fair Value (in dollars per share):          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   130   572  
Minimum [Member] | Spectrum Brands [Member] | Time Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     1 year 1 year  
Maximum [Member] | Spectrum Brands [Member] | Time Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms       1 year  
Maximum [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms       2 years