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Stock Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2014    
Stock-based compensation $ 23.4 $ 6.5  
Vested $ 14,400,000.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 0.9    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 0.6    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year 12 months  
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   36 months  
HGI [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   5 years 3 months 18 days  
Compensation cost not yet recognized 35.7    
Unrecognized compensation cost expected to recognized, years 2 years 2 months 26 days    
Weighted average remaining contractual term of outstanding stock option awards 8 years 10 months 18 days    
Granted $ 46,300,000.00 $ 32,800,000.00  
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, Expected Term 5 years 3 months 18 days    
Volatility 41.22% 42.80%  
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, Expected Term 6 years 0 months 0 days 6 years 0 months 0 days  
Volatility 0.00% 44.00%  
HGI [Member] | Stock option awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, granted 1,326 1,498  
HGI [Member] | Restricted stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity intruments other than options granted 3,302 3,227  
Granted $ 12.00    
Vested $ 10.15    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 5,632   3,456
HGI [Member] | Restricted stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted award vested and exercisable at March 31, 2013 $ 4.61    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 22    
Spectrum Brands [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Restricted Stock Award, Gross 414 574  
Spectrum Brands [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Time-based and vest over period of restricted stock units   1 year  
Spectrum Brands [Member] | Time Based Restricted Stock Units Vesting Over One Year [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity intruments other than options granted   90  
Spectrum Brands [Member] | Performance Based and Time Based Restricted Stock Units Two Year Vesting [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity intruments other than options granted   462  
Spectrum Brands [Member] | Restricted stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted award vested and exercisable at March 31, 2013 $ 0.00    
Equity intruments other than options granted 414 552  
Equity instruments other than options, grant date fair value 29.0 25.6  
Granted $ 68.95    
Vested $ 38.93    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 628   1,118
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 81    
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 45 22  
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 288    
Spectrum Brands [Member] | Performance-based and Time-based Shares [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Time-based and vest over period of restricted stock units   2 years  
FGL [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 4 years 6 months    
Granted $ 10,400,000.00    
Volatility 25.00%    
FGL [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
FGL [Member] | Performance Restricted Stock Unit (PRSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted award vested and exercisable at March 31, 2013 $ 0.00    
Equity intruments other than options granted 469    
Granted $ 17.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 469   0
FGL [Member] | Stock option awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, granted 191    
FGL [Member] | Restricted stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity intruments other than options granted 107    
Granted $ 17.00    
Vested $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 107   0
FGL [Member] | Common Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted $ 1,000,000.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 58    
FGL [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   4 years 6 months  
Compensation cost not yet recognized 18.4    
Unrecognized compensation cost expected to recognized, years 2 years 3 months 18 days    
Volatility   27.00%  
FGL [Member] | Stock option awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, granted 0    
FGL [Member] | Restricted stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted award vested and exercisable at March 31, 2013 $ 0.00    
Equity intruments other than options granted       
Granted $ 0.00    
Vested $ 49.45    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 31   46
EXCO/HGI JV [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized $ 0.5    
Unrecognized compensation cost expected to recognized, years 2 years 37 days    
EXCO/HGI JV [Member] | EXCO/HGI JV Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity intruments other than options granted       
Granted $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 102   102
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 2,433    
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 1,234