Segment Data and Related Information (Schedule of Segment Revenue) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 47,488	$ 41,062	$ 37,780	$ 37,451	$ 52,123	$ 49,480	$ 47,218	$ 52,107	$ 163,781	$ 200,928	$ 191,278
Fiber Optics
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									96,153	125,659	121,724
Photovoltaics
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									$ 67,628	$ 75,269	$ 69,554