Commitments and Contingencies (Operating Leases) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rental expense	$ 1.4	$ 1.2	$ 1.0
Future minimum rental commitments	3.2
Future minimum rental commitments, due in fiscal 2013	1.2
Future minimum rental commitments, due in fiscal 2014	0.7
Future minimum rental commitments, due in fiscal 2015	0.4
Future minimum rental commitments, due in fiscal 2016	0.3
Future minimum rental commitments, due in fiscal 2017	0.2
Future minimum rental commitments, due thereafter	$ 0.4