Discontinued Operations (Income Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit (expense)	$ 0	$ 200	$ 0	$ (33)
Discontinued Operations, Disposed of by Sale [Member] | Photovoltaics Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	0	0
Cost of revenue	0	0	12	0
Gross profit (loss)	0	0	(12)	0
Operating expense (income)	5	(17)	13	(838)
(Loss) income from discontinued operations before income tax expense	(5)	17	(25)	838
Income tax benefit (expense)	0	23		(5)
(Loss) income from discontinued operations, net of tax	(5)	40	(25)	833
Discontinued Operations, Disposed of by Sale [Member] | Digital Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	0	0	0
Cost of revenue	0	0	0	(494)
Gross profit (loss)	0	0	0	494
Operating expense (income)	6	45	2	(285)
Recognition of previously deferred gain on sale of assets	0	0	0	3,804
(Loss) income from discontinued operations before income tax expense	(6)	(45)	(2)	4,583
Income tax benefit (expense)	0	128	0	(28)
(Loss) income from discontinued operations, net of tax	$ (6)	$ 83	$ (2)	$ 4,555