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Property and Equipment, net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Abstract]      
Depreciation $ 16.0 $ 16.9 $ 17.3
Amortization $ 0.5 $ 0.7 $ 1.1