Description of Business (Sale of Fiber Optics-related Assets) (Details) - USD ($) $ in Thousands		12 Months Ended
	May. 07, 2012	Sep. 30, 2013	Jun. 30, 2015	Sep. 30, 2014	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, indemnification assets, range of outcomes, value (up to $3.4 million)					$ 3,400
Deferred gain associated with sale of assets			$ 3,400	$ 3,400
Sumitomo Electric Industries, LTD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets	$ 2,800
Indemnification period	2 years
Proceeds from sale of assets	$ 13,100
Cash held in escrow	2,600
Reduction of purchase price		$ 1,100
Escrow Receivable			1,500
Sumitomo Electric Industries, LTD | Indemnification Obligation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred gain associated with sale of assets			$ 3,400
Discontinued Operations, Disposed of by Sale | Sumitomo Electric Industries, LTD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, indemnification assets, range of outcomes, value (up to $3.4 million)	$ 3,400