Common Unit Repurchase and Retirement (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended					3 Months Ended		9 Months Ended	12 Months Ended		23 Months Ended
	Feb. 29, 2012	Jan. 31, 2012	Dec. 31, 2011	Nov. 30, 2011	Oct. 31, 2011	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2012
Partnerships repurchase units
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program	277	1,220	2,007	215	226	1,497	2,448		2,108	1,197	7,250
Average Price Paid per Unit	$ 4.54	$ 4.63	$ 5.21	$ 4.95	$ 4.96	$ 4.62	$ 5.17	$ 4.94	$ 5.19	$ 4.44
Maximum Number of Units that May Yet Be Purchased Under the Plan II Program		277	1,497	3,504	3,719		1,497	7,250	3,945	6,053	7,250