Commitments and Contingencies (Other Disclosures) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rent expense, net		$ 0.4	$ 0.8	$ 0.8	$ 1.5
Fair value assumptions, credit adjusted risk-free rate, range minimal amount		3.25%		3.25%
Fair value assumptions, credit adjusted risk-free rate, range maximum amount		5.78%		5.78%
Asset retirement obligation, accretion expense		0.1	0.1	0.1	0.1
Business combination, indemnification assets, range of outcomes, value (up to $3.4 million)	3.4
Business combination, indemnification duration, period taken into account for	2 years
Business combination, indemnification assets, amount as of acquisition date (up to $1.5 million)		$ 1.5		$ 1.5