Supporting Financial Information - Accounts Payable, Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable	$ 3,890	$ 5,205
Accrued benefits	2,263	1,831
Accrued bonus and incentive compensation	1,509	1,544
Accrued workers compensation insurance	2,182	1,598
Other accrued expenses	631	717
Total accrued expenses and other current liabilities	$ 10,475	$ 10,895