Supporting Financial Information - Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest expense, net	$ (23)	$ (24)	$ (72)	$ (75)
Amortization of deferred financing costs	0	0	0	(10)
Change in value of financial instruments	0	0	0	99
Miscellaneous other income (expense), net	(11)	7	(651)	9
Other income (expense) net	$ (34)	$ (17)	(723)	23
Settlement of retroactive payment claim, net			(629)	$ 0
Unfavorable Regulatory Action | Department of Labor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Settlement of retroactive payment claim, net			$ (629)