Long-term Debt (Details 5) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Long-term Debt
Interest expense	$ 10,600,000	$ 12,600,000
Non-cash interest expense	1,219,000	3,049,000
Capitalized interest costs	$ 100,000	$ 100,000
Weighted average interest rate (as a percent)	7.20%		7.20%