Assets Held for Sale and Discontinued Operations - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Assets
Total current assets	$ 25,977	$ 45,322
Total current liabilities	21,965	31,798
Net assets included in the disposal group	4,012	13,524
Solar Segment | Discontinued Operations, Held-for-sale
Assets
Total current assets	20,418	39,379
Property, Plant and Equipment - Net	5,559	5,943
Total assets included in the disposal group	25,977	45,322
Total current liabilities	19,545	29,380
Long-Term Debt	2,420	2,418
Total liabilities included in the disposal group	$ 21,965	$ 31,798