Income and other Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax benefit computed at U.S. federal statutory rate									$ 896	$ (1,518)	$ (6,959)
State tax expense benefit, net of U.S. federal effect									(41)	(356)	(776)
Foreign tax rate differential									(94)	(269)	1,041
Effect due to change in tax rate									626	0	0
Release of valuation allowance-domestic									0	0	(17,856)
Other									(57)	108	0
State net operating loss carryforward adjustment									685	0	0
Change in valuation allowance									(2,001)	(156)	0
Income tax expense (benefit)	$ (8)	$ 175	$ (155)	$ 2	$ (339)	$ 456	$ (396)	$ (1,912)	$ 14	$ (2,191)	$ (24,550)
Effective tax rate									0.50%	49.10%	119.90%