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Restructuring and related charges - Additional Information (Details) (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
HHI Business prior to Acquisition by Spectrum Brands Initiatives
     
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 6.2