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Stock Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation $ 25.0 $ 19.9 $ 40.0 $ 34.0  
Executive Bonus Plan [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Executive Bonus Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
HGI [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 9.8   $ 9.8    
Unrecognized compensation cost expected to recognized, years     1 year 2 months 3 days    
Granted     $ 1,600,000 $ 29,600,000  
Exercised/Released     $ 30,300,000 $ 26,200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 2.1 $ 2.2  
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options     $ 3.2 $ 1.9  
HGI [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years 3 years  
HGI [Member] | Stock option awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining contractual term of outstanding stock option awards     7 years 2 months 6 days    
HGI [Member] | Restricted stock awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised/Released     (99)    
Equity intruments other than options granted       1,885  
Exercised/Released     $ 13.93    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,077   2,077   4,283
HGI [Member] | Restricted stock units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, granted     6    
Exercised/Released     0    
Equity intruments other than options granted       6  
Granted     $ 13.93    
Exercised/Released     $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 48   48   42
HGI [Member] | Warrant [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options vested and exercisable at March 31, 2016     600    
HGI [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     0.00% 0.00%  
Options, granted     28 822  
Stock options vested and exercisable at March 31, 2016     3,347    
Spectrum Brands [Member] | Restricted stock units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised/Released     528    
Equity intruments other than options granted     572    
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 54.2 $ 47.8  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 40.2 $ 48.6 $ 40.2 $ 48.6  
Granted     $ 94.73    
Exercised/Released     $ 86.54    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 588   588   608
Spectrum Brands [Member] | Immediate Vest Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross     190 133  
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross     48 132  
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member] | Minimum [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  
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member] | Maximum [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 3 years  
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     334 264  
Spectrum Brands [Member] | Performance-based and Time-based Shares [Member] | Maximum [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  
Spectrum Brands [Member] | Performance Shares [Member] | Maximum [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    
Spectrum Brands [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, granted 130   572    
Equity intruments other than options granted   296   529  
Restricted stock awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,501 3,092 2,130 2,861  
Stock option awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,040 1,316 1,172 1,393  
Employee Stock Option [Member] | HGI [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     1.65454% 1.58%  
Volatility     5 years 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     37.38387% 38.00%  
Employee Stock Option [Member] | HGI [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     1.74249% 1.87%  
Volatility     5 years 6 months 6 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     37.88565% 39.00%