Basis of Presentation - Sale of Fiber Optics-related Assets (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Footnote disclosures:
Gain on sale of assets	$ 2,800,000
Revenue associated with assets sold	1,800,000	9,200,000
Indemnification associated with sale of assets	3,400,000	3,400,000
Proceeds from sale of assets	13,121,000	13,121,000
Cash held in escrow	2,600,000	2,600,000
Escrow, payout period (in years)	2
Deferred gain associated with sale of assets	4,900,000	4,900,000
Fees billed under transition services agreement	500,000
Sale of assets, purchase price adjustment	500,000
Sale of assets, purchase price adjustment, payout period (in months)	12
Expenses incurred directly associated with sale of assets	$ 600,000