Assets Held for Sale, Discontinued Operations and Disposals - Operating Results of Discontinued Operations (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit	$ (100,000)	$ (47,000)
Net loss from discontinued operations, net of tax	(11,151,000)	(11,816,000)
Tempress and SoLayTec | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues, net of returns and allowances	2,155,000	7,442,000
Cost of sales	1,830,000	5,969,000
Gross profit	325,000	1,473,000
Selling, general and administrative	476,000	1,814,000
Research, development and engineering	91,000	540,000
Restructuring charges	37,000	37,000
Operating loss	(279,000)	(918,000)
Loss on sale of subsidiary	(10,916,000)	(10,916,000)
Interest expense and other, net	(22,000)	(29,000)
Loss from discontinued operations before income taxes	(11,217,000)	(11,863,000)
Income tax benefit	(66,000)	(47,000)
Net loss from discontinued operations, net of tax	$ (11,151,000)	$ (11,816,000)