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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2012
Derivative Financial Instruments [Line Items]          
Unrealized Gain (Loss) on Derivatives $ 8,900,000        
Document Period End Date Sep. 30, 2017        
Derivative Asset, Fair Value, Gross Asset $ 100,000        
Long-term debt 5,801,900,000 $ 5,575,400,000      
Spectrum Brands [Member]          
Derivative Financial Instruments [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (500,000) (2,300,000) $ 23,100,000    
Spectrum Brands [Member] | Standby Letters of Credit          
Derivative Financial Instruments [Line Items]          
Letters of Credit Outstanding, Amount       $ 0 $ 0
Spectrum Brands [Member] | Interest Rate Contract [Member]          
Derivative Financial Instruments [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 300,000        
Derivative, Fixed Interest Rate 0.00%        
Derivative, Notional Amount $ 300,000,000 $ 300,000,000      
Derivative, Remaining Maturity 2 years 7 months 6 months      
Spectrum Brands [Member] | Foreign exchange contracts          
Derivative Financial Instruments [Line Items]          
Accumulated Other Comprehensive Income Loss Cumulative Gain Loss From Derivative Instrument Before Tax $ 1,000,000        
Derivative Contracts Market Value 67,500,000 $ 29,900,000      
Spectrum Brands [Member] | Foreign exchange forward agreements          
Derivative Financial Instruments [Line Items]          
Derivative Contracts Market Value 62,900,000 62,000,000      
Spectrum Brands [Member] | Zinc Commodity Swap Contract [Member]          
Derivative Financial Instruments [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 200,000        
Spectrum Brands [Member] | Bronze Commodity Contract [Member]          
Derivative Financial Instruments [Line Items]          
Derivative Contracts Market Value 6,600,000 4,000,000      
Salus Capital Partners LLC          
Derivative Financial Instruments [Line Items]          
Long-term debt $ 22,200,000 $ 30,300,000