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Stock-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 78.0 $ 72.6 $ 73.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   4.0 3.6
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options   $ 4.1 $ 2.8
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years 3 years 3 years
Warrant [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
HGI      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 13.7 $ 25.0 $ 27.0
Common Stock, Capital Shares Reserved for Future Issuance 9,065    
Granted $ 1,600,000 $ 30,800,000 $ 46,700,000
Exercised / Released $ 31,700,000 $ 32,000,000 $ 15,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 3.3    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 4.4    
Compensation cost not yet recognized $ 4.7    
Unrecognized compensation cost expected to recognized, years 11 months 8 days    
HGI | Stock option awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining contractual term of outstanding stock option awards 6 years 8 months 11 days    
HGI | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, granted 28 977 1,356
Granted $ 13.93    
HGI | Restricted stock awards      
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, Vested in Period 2,407    
Equity intruments other than options granted 99 1,885 3,325
Granted $ 13.93    
Exercised / Released $ 11.01    
HGI | Restricted Stock Units (RSUs) [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, Vested in Period 6    
Equity intruments other than options granted 6 48 7
Granted $ 13.93    
Exercised / Released 13.93    
HGI | Warrant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 9,600,000    
Granted $ 13.13    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 600    
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     203
Spectrum Brands [Member] | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, granted 590    
Equity intruments other than options granted   573 669
Spectrum Brands [Member] | Restricted Stock Units (RSUs) [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, Vested in Period 549    
Equity intruments other than options granted 590    
Granted $ 94.88    
Exercised / Released $ 86.97    
Equity instruments other than options, grant date fair value $ 56.0 $ 52.9 $ 50.5
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     143
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      
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] | Performance-based and Time-based Shares | 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 2 years   2 years
Spectrum Brands [Member] | Performance-based and Time-based Shares | Maximum      
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 Based Vesting [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Restricted Stock Award, Gross     323
2011 HGI Plan, as amended [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Additional Amount 7,000    
2011 HGI Plan, as amended [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 17,000    
2014 HGI Warrant Plan [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,000    
2014 HGI Warrant Plan [Member] | Warrant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 600    
Spectrum Brands 2011 Plan [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,626    
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Restricted Stock Award, Gross 167 160