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Restructuring and related charges - Summarization of Restructuring and Related Charges (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 22.9 $ 34.0 $ 19.6
Consumer products cost of goods sold classification
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 3.7 10.0 9.8
Selling, acquisition, operating and general expenses classification
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 19.2 24.0 9.8
Global Cost Reduction Initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 13.4 11.3 0
Charges Since Inception 100.7    
Expected Future Charges 4.4    
Total Projected Costs 105.1    
Expected Completion Date Jan. 31, 2015    
HHI Business Rationalization Initiatives [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4.5 0 0
Charges Since Inception 4.5    
Expected Future Charges 4.5    
Total Projected Costs 9.0    
Expected Completion Date Sep. 30, 2016    
Global Expense Rationalization Initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 1.3 16.4 18.7
Charges Since Inception 24.7    
Expected Future Charges 21.8    
Total Projected Costs 46.5    
Expected Completion Date Sep. 30, 2015    
Other initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 3.7 $ 6.3 $ 0.9