Summary of Significant Accounting Policies Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]
Valuation Allowances and Reserves, Balance	$ 148	$ 254	$ 148	$ 59	$ 24
Allowance for Doubtful Accounts Receivable, Period Increase	0	106	89	59
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	0	0	0	(24)
Deferred Tax Assets, Valuation Allowance	50,775	60,005	49,221	35,170	29,457
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	2,637	9,226	13,979	5,717
Valuation Allowance, Deferred Tax Asset, (Decrease)	$ (1,083)	$ 4	$ 72	$ (4)