Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Accrued Expenses
Employee compensation	$ 8,825	$ 7,791
Taxes, other than income taxes	2,673	2,422
Employee termination liabilities	1,562
Professional fees	1,225	746
Management incentive compensation	1,104
Utilities	982	909
Capital lease obligation, current	147	926
Other	945	1,314
Total accrued expenses	$ 17,463	$ 14,108