Significant Concentration of Credit Risk (Details Textual) (USD $)	12 Months Ended
	Sep. 30, 2012 Tenant sqft	Sep. 30, 2011 Tenant	Sep. 30, 2010 Tenant
Significant consentrations of credit risk (Textual)
Total property (In square feet)	8,506,000
Number of tenants	3	3	3
Renatable space [Member] | Lessee concentration risk [Member]
Significant consentrations of credit risk (Textual)
Description of total rentable space leased	Greater than 5% of total rentable square footage.	Greater than 5% of total rentable square footage.	Greater than 5% of total rentable square footage.
Renatable space [Member] | Lessee concentration risk [Member] | FDX and Subsidiaries [Member]
Significant consentrations of credit risk (Textual)
Rental and reimbursement revenue	27,202,000	26,883,000	26,160,000
Rental and reimbursement revenue, Percentage	54.00%	56.00%	57.00%