Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities:
Net income	$ 127,771	$ 77,468	$ 81,013
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	1,102	993	973
Straight line office rent	(345)	(352)	3
Amortization expense related to other assets	9,416	9,416	9,416
Provision (benefit) for deferred taxes	(1,108)	1,559	5,229
Operating expenses paid in The RMR Group Inc. common shares	3,608	3,774	4,122
Equity in earnings of investees	0	0	(443)
Distributions from equity method investments	2,221	841	1,456
Gain on Tremont Mortgage Trust investment	0	0	(2,059)
Gain on equity method investments accounted for under the fair value option	(25,237)	(1,010)	(18,811)
Changes in assets and liabilities:
Due from related parties	(6,584)	(18,720)	(4,278)
Prepaid and other current assets	(1,625)	649	(2,144)
Reimbursable accounts payable and accrued expenses	(2,297)	25,106	(964)
Accounts payable and accrued expenses	2,293	1,546	(1,719)
Net cash from operating activities	109,215	101,270	71,794
Cash Flows from Investing Activities:
Purchase of property and equipment	(3,983)	(1,121)	(1,142)
Equity method investment in Seven Hills Realty Trust	0	(9,469)	0
Proceeds from sale of TravelCenters of America Inc. common shares	53,479	0	0
Net cash provided by (used in) investing activities	49,496	(10,590)	(1,142)
Cash Flows from Financing Activities:
Distributions to noncontrolling interest	(50,145)	(32,941)	(137,705)
Distributions to common shareholders	(26,576)	(25,730)	(139,783)
Repurchase of common shares	(734)	(547)	(834)
Payments under the tax receivable agreement	(2,355)	(2,209)	(2,158)
Net cash used in financing activities	(79,810)	(61,427)	(280,480)
Increase (decrease) in cash and cash equivalents	78,901	29,253	(209,828)
Cash and cash equivalents at beginning of period	189,088	159,835	369,663
Cash and cash equivalents at end of period	267,989	189,088	159,835
Supplemental Cash Flow Information and Non-Cash Activities:
Income taxes paid	21,233	9,555	10,047
Recognition of right of use assets and related lease liabilities	5,057	1,295	2,249
Equity method investment in Seven Hills Realty Trust	0	0	(8,513)
Equity method investment in Tremont Mortgage Trust	$ 0	$ 0	$ 6,454