Income Taxes - NOL (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Net operating loss carryforwards
Net operating loss carryforwards	$ 21,530
Tax credit		$ 504
Undistributed losses of foreign subsidiaries	62,497
Undistributed losses of foreign subsidiaries taxes	0
State
Net operating loss carryforwards
Net operating loss carryforwards	11,666	3,453
Tax credit	3,205	1,198
Foreign
Net operating loss carryforwards
Net operating loss carryforwards	$ 2,249	349
Net operating loss carryforward valuation allowance		$ 1,539