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Restructuring and related charges - Summarization of Remaining Accrual Balance Associated with Initiatives and Activity (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 $ 16.7    
Provisions 10.8    
Cash Expenditures (15.5)    
Non-Cash Items (9.2)    (5.2)
Accrual Balance at September 30, 2014 11.8 16.7  
Expensed as Incurred 12.1 [1]    
Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 7.3    
Provisions 5.0    
Cash Expenditures (7.0)    
Accrual Balance at September 30, 2014 5.5    
Expensed as Incurred 8.4 [1]    
Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 5.3    
Provisions 0.2    
Cash Expenditures (4.2)    
Accrual Balance at September 30, 2014 1.5    
Expensed as Incurred 1.1 [1]    
Other initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 4.1    
Provisions 5.6    
Cash Expenditures (4.3)    
Accrual Balance at September 30, 2014 4.8    
Expensed as Incurred 2.6 [1]    
Termination benefits | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 7.3    
Provisions 3.5    
Cash Expenditures (7.0)    
Accrual Balance at September 30, 2014 4.1    
Expensed as Incurred 3.0 [1]    
Termination benefits | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 4.9    
Provisions 0.2    
Cash Expenditures (3.5)    
Accrual Balance at September 30, 2014 1.3    
Expensed as Incurred 0 [1]    
Other costs | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 0    
Provisions 1.5    
Cash Expenditures 0    
Accrual Balance at September 30, 2014 1.4    
Expensed as Incurred 5.4 [1]    
Other costs | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2013 0.4    
Provisions 0    
Cash Expenditures (0.7)    
Accrual Balance at September 30, 2014 0.2    
Expensed as Incurred 1.1 [1]    
Spectrum Brands
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items (0.2)    
Spectrum Brands | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items 0.2    
Spectrum Brands | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items 0.2    
Spectrum Brands | Other initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items (0.6)    
Spectrum Brands | Termination benefits | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items 0.3    
Spectrum Brands | Termination benefits | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items (0.3)    
Spectrum Brands | Other costs | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items (0.1)    
Spectrum Brands | Other costs | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Non-Cash Items $ 0.5    
[1] Consists of amounts not impacting the accrual for restructuring and related charges.