Segment Data and Related Information (Schedule of Depreciation, Amortization, and Accretion Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	$ 2,099	$ 1,966	$ 6,161	$ 7,118
Fiber Optics
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	1,479	993	4,145	3,919
Photovoltaics
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	$ 620	$ 973	$ 2,016	$ 3,199