Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deferred Tax Assets:
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 207	$ 243
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	8,054	12,915
Deferred Tax Assets, Operating Loss Carryforwards	46,881	77,497
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,172	1,807
Deferred Tax Assets Investments	119	82
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	665	1,570
Deferred Tax Assets, Capital Loss Carryforwards	94	337
Deferred Tax Assets, Other	712	3,195
Deferred Tax Assets, Gross	57,904	97,646
Deferred Tax Assets, Valuation Allowance	4,127	2,366
Deferred Tax Assets, Net	53,777	95,280
Deferred Tax Liabilities:
Deferred Tax Liabilities, Property, Plant and Equipment	1,122	2,019
Deferred Tax Liabilities Goodwill And Intangible Assets	5,499	6,548
Deferred Tax Liabilities, Other	576	502
Deferred Income Tax Liabilities, total	7,197	9,069
Deferred Tax Assets (Liabilities), Net	$ 46,580	$ 86,211