Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 197,654	$ 131,564	$ 379,222	$ 288,510
Expenses:
Compensation and benefits	31,710	30,586	63,501	60,080
Equity based compensation	1,988	1,752	4,207	5,313
Separation costs	217	0	217	4,159
Total compensation and benefits expense	33,915	32,338	67,925	69,552
General and administrative	8,470	7,104	16,141	13,364
Other reimbursable expenses	133,493	75,208	253,051	174,593
Transaction and acquisition related costs	0	296	0	413
Depreciation and amortization	242	251	478	489
Total expenses	176,120	115,197	337,595	258,411
Operating income	21,534	16,367	41,627	30,099
Interest and other income	66	204	123	435
Equity in earnings of investees	0	303	0	727
Unrealized (loss) gain on equity method investments accounted for under the fair value option	(4,560)	(3,402)	(3,364)	4,720
Income before income tax expense	17,040	13,472	38,386	35,981
Income tax expense	(2,451)	(1,992)	(5,505)	(4,748)
Net income	14,589	11,480	32,881	31,233
Net income attributable to noncontrolling interest	(8,197)	(6,539)	(18,447)	(17,395)
Net income attributable to The RMR Group Inc.	$ 6,392	$ 4,941	$ 14,434	$ 13,838
Weighted average common shares outstanding - basic (in shares)	16,329	16,256	16,327	16,254
Weighted average common shares outstanding - diluted (in shares)	31,331	31,280	31,328	31,254
Net income attributable to The RMR Group Inc. per common share - basic (in dollars per share)	$ 0.39	$ 0.30	$ 0.88	$ 0.84
Net income attributable to The RMR Group Inc. per common share - diluted (in dollars per share)	$ 0.39	$ 0.30	$ 0.88	$ 0.81
Total management and advisory services revenues
Revenues:
Total revenues	$ 49,288	$ 41,991	$ 95,303	$ 83,324
Management services
Revenues:
Total revenues	48,151	40,242	93,048	80,989
Incentive business management fees
Revenues:
Total revenues	0	620	0	620
Advisory services
Revenues:
Total revenues	1,137	1,129	2,255	1,715
Total reimbursable costs
Revenues:
Total revenues	148,366	89,573	283,919	205,186
Reimbursable compensation and benefits
Revenues:
Total revenues	13,506	13,159	27,903	26,384
Reimbursable equity based compensation
Revenues:
Total revenues	1,367	1,206	2,965	4,209
Other reimbursable expenses
Revenues:
Total revenues	$ 133,493	$ 75,208	$ 253,051	$ 174,593