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Related Party Transactions - Other (Details) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2016	Jun. 05, 2015
Related Party Transaction [Line Items]
Interest paid		$ 0	$ 0	$ 144,000
Percentage of Executives' Business Time Devoted to Services to Managed Operators
Related Party Transaction [Line Items]
Related party transaction percentage		80.00%
Percentage of Executives' Cash Compensation Paid by Managed Operators
Related Party Transaction [Line Items]
Related party transaction percentage		80.00%
Directors’ and Officers Liability Insurance Policy
Related Party Transaction [Line Items]
Premiums paid		$ 176,000	$ 152,000	147,000
Prepaid insurance for 2017	$ 202,000	202,000
Insurance policy extension (in years)	1 year
Premium for extension of insurance policy	$ 111,000
ABP Trust
Related Party Transaction [Line Items]
Advances outstanding between related parties					$ 0
ABP Trust | RMR LLC
Related Party Transaction [Line Items]
Ownership percentage						100.00%
RMR LLC
Related Party Transaction [Line Items]
Loans made to RMR LLC	$ 0	$ 0		57,000,000
The Founders
Related Party Transaction [Line Items]
Interest paid				$ 144,000

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