Assets Held for Sale and Discontinued Operations - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Assets
Total current assets	$ 22,965	$ 45,322
Total current liabilities	18,484	31,798
Tempress | Discontinued Operations, Held-for-sale
Assets
Total current assets	17,468	39,379
Property, plant and equipment - net	5,497	5,943
Total assets included in the disposal group	22,965	45,322
Total current liabilities	18,191	29,380
Long-term debt	293	2,418
Total liabilities included in the disposal group	18,484	31,798
Net assets included in the disposal group	$ 4,481	$ 13,524