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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
9 Months Ended
Jun. 30, 2017
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  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1.6  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 29,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 343  
HGI [Member] | Time Based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 15.71  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 25  
HGI [Member] | Restricted stock awards [Member]    
Shares:    
Restricted award outstanding at September 30, 2012 1,975  
Exercised/Released 1,832  
Restricted award outstanding at March 31, 2013 168  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 12.69  
Restricted award expected to vest 13.72 $ 12.74
HGI [Member] | Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 0.00  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0  
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  
HGI [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 318  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 1,900,000  
Restricted award expected to vest 3.89  
Spectrum Brands [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 39,000,000  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 293  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 49,000,000  
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 0.00  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0  
Spectrum Brands [Member] | Performance-based and Time-based Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 122.53  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 400  
Spectrum Brands [Member] | Restricted stock awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 133.15  
Spectrum Brands [Member] | Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted $ 127.02  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 25.3  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 293  
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 88.0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (8)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 117.21  
Shares:    
Restricted award outstanding at September 30, 2012 577  
Exercised/Released 499  
Restricted award outstanding at March 31, 2013 763  
Weighted Average Grant Date Fair Value (in dollars per share):    
Restricted award outstanding at September 30, 2012 $ 94.97  
Exercised/Released 109.03  
Restricted award expected to vest $ 114.65  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 693  
Spectrum Brands [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 0  
Weighted Average Grant Date Fair Value (in dollars per share):    
Exercised/Released $ 0