Segment Data and Related Information (Statement of Operations Data) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Operating income (loss)	$ 12,171	$ 12,171	$ (8,884)	$ 15,017	$ (20,574)
Fiber Optics
Segment Reporting Information [Line Items]
Operating income (loss)		7,892	(7,251)	7,497	(18,444)
Photovoltaics
Segment Reporting Information [Line Items]
Operating income (loss)		$ 4,279	$ (1,633)	$ 7,520	$ (2,130)