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, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax (benefit) provision	$ (100,000)	$ 19,000	$ (47,000)	$ 37,000
Net loss from discontinued operations, net of tax	(11,151,000)	(6,647,000)	(11,816,000)	(9,267,000)
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	8,153,000	7,442,000	14,381,000
Cost of sales	1,830,000	9,229,000	5,969,000	15,352,000
Gross profit (loss)	325,000	(1,076,000)	1,473,000	(971,000)
Selling, general and administrative	476,000	4,082,000	1,814,000	5,677,000
Research, development and engineering	91,000	831,000	540,000	1,911,000
Restructuring charges	37,000	591,000	37,000	601,000
Operating loss	(279,000)	(6,580,000)	(918,000)	(9,160,000)
Loss on sale of subsidiary	(10,916,000)		(10,916,000)
Interest expense and other, net	(22,000)	(48,000)	(29,000)	(70,000)
Loss from discontinued operations before income taxes	(11,217,000)	(6,628,000)	(11,863,000)	(9,230,000)
Income tax (benefit) provision	(66,000)	19,000	(47,000)	37,000
Net loss from discontinued operations, net of tax	$ (11,151,000)	$ (6,647,000)	$ (11,816,000)	$ (9,267,000)