Income and other Taxes (Narrative) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 8,000	$ (175,000)	$ 155,000	$ (2,000)	$ 339,000	$ (456,000)	$ 396,000	$ 1,912,000	$ (14,000)	$ 2,191,000	$ 24,550,000
Alternative minimum tax										600,000
Deferred income tax benefit from discontinued operations										24,100,000
Income tax (expense) benefit, discontinued operations									$ 24,000	$ (26,500,000)	$ (500,000)
Effective tax rate									(0.50%)	(49.10%)	(119.90%)
Decrease in unrecognized tax benefits									$ 100,000	$ 200,000
Income tax penalties and interest accrued	300,000								300,000
Operating loss carryforward portion subject limitation	226,500,000								226,500,000
Operating loss carryforward portion not subject to limitation	207,200,000								207,200,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	433,700,000								433,700,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	200,000								200,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	139,300,000								139,300,000
Continuing Operations [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits									112,800	100,000
Discontinued Operations [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits									12,000	100,000
Income tax credits and adjustments									400,000	$ 200,000	$ 800,000
Foreign Income and Research And Development Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 3,000,000								$ 3,000,000