Accounts Receivable (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 116	$ 22	$ 108
Provision adjustment - expense, net of recoveries	556	54	0
Write-offs and other adjustments - additions (deductions) to receivable balances	(210)	40	(86)
Balance at end of period	$ 462	$ 116	$ 22