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Restructuring and related charges - Summarization of Restructuring and Related Charges (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 28.7 $ 22.9 $ 34.0
Consumer products cost of goods sold classification      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 2.1 3.7 10.0
Selling, acquisition, operating and general expenses classification      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 26.6 19.2 24.0
Global Cost Reduction Initiatives      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 17.1 13.4 11.3
Charges Since Inception 101.8    
Expected Future Charges 0.0    
Total Projected Costs $ 101.8    
Expected Completion Date Sep. 30, 2015    
HHI Business Rationalization Initiatives [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 10.3 4.5 0.0
Charges Since Inception 14.8    
Expected Future Charges 0.2    
Total Projected Costs $ 15.0    
Expected Completion Date Sep. 30, 2016    
Global Expense Rationalization Initiatives      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 1.2 1.3 16.4
Charges Since Inception 41.8    
Expected Future Charges 3.9    
Total Projected Costs $ 45.7    
Expected Completion Date Sep. 30, 2018    
Other initiatives      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0.1 $ 3.7 $ 6.3