Property and Equipment, net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation	$ 6.6	$ 5.7	$ 5.7
Furniture and Fixtures, Gross	6.8	5.2
Capitalized Computer Software, Gross	22.8	9.0
Machinery and Equipment, Gross	20.6	16.1
Leasehold Improvements, Gross	11.9	9.9
Property, Plant and Equipment, Gross	62.1	40.2
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	32.7	20.5
Property, Plant and Equipment, Net	$ 29.4	$ 19.7
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