Segment Data and Related Information (Schedule of Segment Revenue) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 43,091	$ 33,473	$ 42,277	$ 49,306	$ 47,488	$ 41,062	$ 37,780	$ 37,451	$ 168,147	$ 163,781	$ 200,928
Fiber Optics
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									96,977	96,153	125,659
Photovoltaics
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									$ 71,170	$ 67,628	$ 75,269