Supporting Financial Information - Accounts Payable, Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable	$ 4,070	$ 5,205
Accrued benefits	2,283	1,831
Accrued bonus and incentive compensation	721	1,544
Accrued workers compensation insurance	2,062	1,598
Other accrued expenses	400	717
Total accrued expenses and other current liabilities	$ 9,536	$ 10,895