Quarterly Financial Data (unaudited) (Details 2) (USD $)	3 Months Ended				12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Quarterly Financial Data (unaudited)
Loss of sale of interest in an equity-method investment	$ 3,200,000			$ 6,300,000
Asset impairment charge		13,000,000
Restructuring costs			$ 700,000	$ 1,400,000	$ 0	$ 2,145,000	$ 17,930,000