Income and other Taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Federal net operating loss carryforwards	$ 147,704	$ 155,741
Foreign net operating loss carryforwards	66	646
Income tax credit carryforwards	3,033	2,641
Inventory reserves	2,283	4,439
Accounts receivable reserves	149	51
Accrued warranty reserve	587	1,171
State net operating loss carryforwards	9,527	10,454
Stock compensation	2,837	3,300
Deferred compensation	1,080	1,647
Fixed assets and intangibles	1,646	10,501
Capital loss carryover	0	10,565
Other	1,388	1,868
Total deferred tax assets	170,300	203,024
Valuation allowance	(170,300)	(178,944)
Net deferred tax assets	$ 0	$ 24,080