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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	$ 2,173	$ 2,099	$ 6,336	$ 6,161
Fiber Optics
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	1,521	1,479	4,461	4,145
Photovoltaics
Segment Reporting Information [Line Items]
Depreciation, amortization, and accretion expense	$ 652	$ 620	$ 1,875	$ 2,016