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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
Dec. 31, 2016
Dec. 31, 2015
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]      
Document Fiscal Year Focus 2016    
Granted $ 2,300,000 $ 1,600,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3.9    
Weighted Average Grant Date Fair Value (in dollars per share):      
Exercised/Released $ 23,100,000 $ 28,100,000  
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 1,543    
Restricted award outstanding at March 31, 2013 457    
Weighted Average Grant Date Fair Value (in dollars per share):      
Exercised/Released $ 12.57    
Restricted award expected to vest $ 13.49   $ 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 $ 3.94    
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 398    
Spectrum Brands [Member] | Restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted $ 126.97    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 60.8 $ 44.5  
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 87.3 $ 42.1  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 2    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 110.02    
Shares:      
Restricted award outstanding at September 30, 2012 577    
Exercised/Released 477    
Restricted award outstanding at March 31, 2013 790    
Weighted Average Grant Date Fair Value (in dollars per share):      
Restricted award outstanding at September 30, 2012 $ 94.97    
Exercised/Released 109.31    
Restricted award expected to vest $ 114.21    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 688    
Spectrum Brands [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 688    
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   442  
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