Description of Business - Sale of Fiber Optics-related Assets (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	May 31, 2013	Sep. 30, 2012	May 07, 2012 Sumitomo Electric Industries, LTD	Sep. 30, 2014 Sumitomo Electric Industries, LTD	Sep. 30, 2013 Sumitomo Electric Industries, LTD	May 07, 2012 Sumitomo Electric Industries, LTD	Sep. 30, 2014 Indemnification Obligation Sumitomo Electric Industries, LTD
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations Line Items
Gain on sale of assets					$ 2,800,000
Indemnification associated with sale of assets (up to $3.4 million)							3,400,000	3,400,000
Indemnification period					2 years
Proceeds from sale of assets	0	1,150,000		13,121,000	13,100,000
Cash held in escrow								2,600,000
Escrow, payout period (in years)						2 years
Reduction of purchase price							1,100,000
Additional gain recognized from sale							400,000
Deferred gain associated with sale of assets	3,400,000	0							3,400,000
Fees billed under transition services agreement	3,300,000	2,800,000
Credit to be applied against fees earned			500,000
Expenses incurred directly associated with sale of assets			$ 600,000