Description of Business (Sale of Fiber Optics-related Assets) (Details) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	May 07, 2012 Sumitomo Electric Industries, LTD	Sep. 30, 2013 Sumitomo Electric Industries, LTD	Sep. 30, 2013 Sumitomo Electric Industries, LTD	Sep. 30, 2013 Indemnification Obligation Sumitomo Electric Industries, LTD
Footnote disclosures:
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	1,150,000	13,121,000	0			13,100,000
Cash held in escrow					2,600,000	2,600,000
Escrow, payout period (in years)						2 years
Deferred gain associated with sale of assets					4,900,000	4,900,000	3,400,000
Purchase price adjustment contingencies					1,500,000	1,500,000
Reduction of purchase price					1,100,000
Additional gain recognized from sale					400,000
Fees billed under transition services agreement					1,300,000	2,800,000
Sale of assets, purchase price adjustment						500,000
Sale of assets, purchase price adjustment, payout period (in months)						12 months
Expenses incurred directly associated with sale of assets						$ 600,000