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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]          
Document Fiscal Year Focus     2017    
Bronze Commodity Contract [Member] | Cost of Sales [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ 0.0 $ 0.0 $ 0.1 $ 0.0  
Foreign Exchange Contract [Member] | Other Income Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (1.0) 0.8 (2.4) 1.6  
Spectrum Brands [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (43.9) 9.6 (11.1) 8.8  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2.6 (1.1) 11.2 (0.2)  
Spectrum Brands [Member] | Interest Rate Swap [Member] | Interest Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (0.7) (0.2) (1.0) (0.5)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.0 (0.4) (1.0) (1.4)  
Spectrum Brands [Member] | Commodity contracts [Member] | Cost Of Goods Sold [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (0.5) 2.1 3.3 2.9  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1.3 (0.8) 3.8 (3.8)  
Spectrum Brands [Member] | Net Investment Hedging [Member] | Other Income Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (32.6) 0.0 (9.3) 0.0  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.0 0.0 0.0 0.0  
Spectrum Brands [Member] | Bronze Commodity Contract [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Contracts Market Value 5.9   5.9   $ 4.0
Spectrum Brands [Member] | Foreign Exchange Contract [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Contracts Market Value 283.5   283.5   $ 224.8
Spectrum Brands [Member] | Foreign Exchange Contract [Member] | Cost Of Goods Sold [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (10.3) 8.0 (4.4) 6.8  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1.3 0.1 8.4 5.0  
Spectrum Brands [Member] | Foreign Exchange Contract [Member] | Sales Revenue, Net [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0.2 (0.3) 0.3 (0.4)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0.0 $ 0.0 $ 0.0 $ 0.0