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Property and Equipment, net (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]      
Depreciation $ 5.7 $ 5.7 $ 5.8
Furniture and Fixtures, Gross 5.2 5.2  
Capitalized Computer Software, Gross 9.0 6.2  
Machinery and Equipment, Gross 16.1 10.9  
Leasehold Improvements, Gross 9.9 9.3  
Property, Plant and Equipment, Gross 40.2 31.6  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 20.5 15.7  
Property, Plant and Equipment, Net $ 19.7 $ 15.9  
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 10 years