Segment Data and Related Information (Statement of Operations Data) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Operating (loss) income	$ (3,131)	$ (7,669)	$ (10,620)	$ 7,348
Fiber Optics
Segment Reporting Information [Line Items]
Operating (loss) income	(5,092)	(8,998)	(18,983)	(1,501)
Photovoltaics
Segment Reporting Information [Line Items]
Operating (loss) income	$ 1,961	$ 1,329	$ 8,363	$ 8,849