Supporting Financial Information - Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Document Fiscal Year Focus			2017
Interest income (expense), net	$ (215)	$ 0	$ (440)		$ 0
Amortization of deferred financing costs	(67)	0	(127)	$ 0	0
Increase (Decrease) in Derivative Assets and Liabilities	27	0	(52)
Other income (expense), net		(127)	0		$ (702)
Other income (expense) net	$ (255)	$ (127)	$ (619)	$ (702)