Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 517	$ 246	$ 181
Provision	199	271	115
Write offs	(78)	0	(50)
Balance at end of year	$ 638	$ 517	$ 246