Income and other Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Operating Loss Carryforwards [Line Items]
Income tax benefit	$ 339	$ (456)	$ 396	$ 1,912	$ 23,171	$ 732	$ (433)	$ 1,080	$ 2,191	$ 24,550	$ 3,393
Alternative minimum tax									600
Deferred income tax expense benefit from discontinued operations									24,100
Discontinued operations, tax effect									$ (26,500)	$ (500)	$ (3,500)
Effective tax rate									(49.10%)	(119.90%)	(37.90%)
Decrease in unrecognized tax benefits									$ 200
Income tax penalties and interest accrued	300				$ 400				300	$ 400
Operating loss carryforward portion subject limitation	247,300								247,300
Operating loss carryforward portion not subject to limitation	187,100								187,100
Foreign Income And Research And Development Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	3,000								3,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	434,400								434,400
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500								500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 243,000								243,000
Continuing Operations [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits									100
Discontinued Operations [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits									100
Income tax credits and adjustments									$ 200	$ 800	$ 1,800