Computation of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Current
Current Federal	$ 2,422	$ (13,726)	$ (16,901)
Current Foreign	286	148	647
Current State		6	4
Total current income tax expenses (benefits)	2,708	(13,572)	(16,250)
Deferred:
Deferred Federal		2,881	964
Deferred Foreign	(25)	1,328	(1,907)
Total Deferred Income Tax Expense (benefits)	(25)	4,209	(943)
Income tax expense	$ 2,683	$ (9,363)	$ (17,193)