Debt Obligations (Details 2) (USD $)	6 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Debt Obligations
Total debt obligations	$ 258,155,000	$ 206,684,000
Mortgages Payable
Debt Obligations
Total debt obligations	220,755,000	169,284,000
Mortgages payable maturing in April 2022 | Yonkers, NY
Debt Obligations
Total debt obligations	1,909,000	1,954,000
Interest rate (as a percent)	5.25%
Mortgages payable maturing in April 2019 | Palm Beach Gardens, FL
Debt Obligations
Total debt obligations	45,200,000	45,200,000
Interest rate (as a percent)	3.78%
Mortgages payable maturing in April 2019 | Melbourne, FL
Debt Obligations
Total debt obligations	7,680,000	7,680,000
Interest rate (as a percent)	3.98%
Mortgages payable maturing in February 2015 | Marietta, GA
Debt Obligations
Total debt obligations	7,421,000	6,462,000
Interest rate (as a percent)	6.50%
Mortgages payable maturing in March 2022 | Lawrenceville, GA
Debt Obligations
Total debt obligations	4,687,000	4,687,000
Interest rate (as a percent)	4.49%
Mortgages payable maturing in July 2022 | Collierville, TN
Debt Obligations
Total debt obligations	25,680,000	25,680,000
Interest rate (as a percent)	3.91%
Mortgages payable maturing in November 2022 | North Charleston, SC
Debt Obligations
Total debt obligations	17,716,000
Interest rate (as a percent)	3.79%
Mortgages payable maturing in February 2023 | Panama City, FL
Debt Obligations
Total debt obligations	5,588,000
Interest rate (as a percent)	4.06%
Mortgages payable maturing in December 2022 | Cordova, TN
Debt Obligations
Total debt obligations	19,248,000
Interest rate (as a percent)	3.71%
Mortgages payable maturing in December 2022 | Decatur, GA
Debt Obligations
Total debt obligations	8,046,000
Interest rate (as a percent)	3.74%
Mortgages payable maturing in January 2015 | 65 Market St - Newark, NJ
Debt Obligations
Total debt obligations	900,000	900,000
Interest rate (as a percent)	7.00%
Mortgages payable maturing in August 2030 | 909 Broad St - Newark, NJ
Debt Obligations
Total debt obligations	6,034,000	6,132,000
Interest rate (as a percent)	6.00%
Mortgages payable maturing in June 2013 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	2,738,000	2,738,000
Interest rate (as a percent)	17.00%
Mortgages payable maturing in June 2013 | Teachers Village - Newark, NJ | Primary beneficiary | RBH-TRB Newark Holdings LLC | Subsidiaries | Guarantee
Debt Obligations
Guaranteed obligations	685,000	685,000
Mortgages payable maturing in December 2030 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	22,748,000	22,748,000
Interest rate (as a percent)	5.50%
Mortgages payable maturing in December 2030 | Teachers Village - Newark, NJ | Primary beneficiary | RBH-TRB Newark Holdings LLC | Subsidiaries
Debt Obligations
Interest rate (as a percent)	5.50%
Interest covered by United States Treasury Department (as a percent)	4.99%
Effective interest rate (as a percent)	0.51%
Mortgages payable maturing in February 2032 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	4,250,000	4,250,000
Interest rate (as a percent)	3.46%
Mortgages payable maturing in February 2022 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	975,000	988,000
Interest rate (as a percent)	2.00%
Mortgages payable maturing in February 2014 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	799,000	1,380,000
Interest rate (as a percent)	2.50%
Mortgages payable maturing in February 2034 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	1,832,000	1,832,000
Mortgages payable maturing in February 2034 | Teachers Village - Newark, NJ | Primary beneficiary | RBH-TRB Newark Holdings LLC | Subsidiaries
Debt Obligations
Bonds serviced in full by annual PILOT	256,000
Bonds serviced in full by annual PILOT at maturity	281,000
Mortgages payable maturing in August 2019 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	15,700,000	15,700,000
Reference rate	LIBOR
Margin interest above reference rate (as a percent)	3.00%
Mortgages payable maturing in September 2042 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	5,250,000	5,250,000
Interest rate (as a percent)	3.28%
Mortgages payable maturing in December 2023 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	14,142,000	13,491,000
Interest rate (as a percent)	8.65%
Mortgages payable maturing in August 2034 | Teachers Village - Newark, NJ
Debt Obligations
Total debt obligations	2,212,000	2,212,000
Mortgages payable maturing in August 2034 | Teachers Village - Newark, NJ | Primary beneficiary | RBH-TRB Newark Holdings LLC | Subsidiaries
Debt Obligations
Bonds serviced in full by annual PILOT	311,000
Bonds serviced in full by annual PILOT at maturity	$ 344,000