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Shareholders’ Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands														12 Months Ended
	Oct. 16, 2024	Aug. 15, 2024	May 16, 2024	Feb. 15, 2024	Nov. 16, 2023	Aug. 17, 2023	May 18, 2023	Feb. 16, 2023	Nov. 17, 2022	Aug. 18, 2022	May 19, 2022	Feb. 17, 2022	Nov. 18, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Common class A and B1
Class of Stock [Line Items]
Dividends paid (in dollars per share)		$ 0.45	$ 0.45	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.38	$ 0.38	$ 1.70	$ 1.60	$ 1.56
Value of dividends		$ 7,526	$ 7,529	$ 6,684	$ 6,684	$ 6,645	$ 6,648	$ 6,641	$ 6,642	$ 6,600	$ 6,601	$ 6,265	$ 6,264	$ 28,423	$ 26,576	$ 25,730
Common class A and B1 | Subsequent Event
Class of Stock [Line Items]
Dividends paid (in dollars per share)	$ 0.45
Value of dividends	$ 7,581
Membership Units | Subsequent Event | RMR LLC
Class of Stock [Line Items]
Shares owned (in shares)	16,846,025
RMR LLC | Membership Units
Class of Stock [Line Items]
Dividends paid (in dollars per share)		$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.30	$ 0.30	$ 1.28	$ 1.28	$ 1.24
Value of dividends		$ 10,152	$ 10,154	$ 10,147	$ 10,148	$ 10,116	$ 10,118	$ 10,113	$ 10,114	$ 10,080	$ 10,080	$ 9,446	$ 9,446	$ 40,601	$ 40,461	$ 39,052
RMR LLC | Membership Units | Subsequent Event
Class of Stock [Line Items]
Value of dividends	$ 10,191
Common distributions declared (in dollars per share)	$ 0.32
RMR LLC | Abp Trust | Membership Units
Class of Stock [Line Items]
Value of dividends		4,800	4,800	4,800	4,800	4,800	4,800	4,800	4,800	4,800	4,800	4,500	4,500	19,200	19,200	18,600
RMR LLC | Abp Trust | Membership Units | Subsequent Event
Class of Stock [Line Items]
Value of dividends	$ 4,800
RMR LLC | RMR, Inc | Membership Units
Class of Stock [Line Items]
Value of dividends		$ 5,352	$ 5,354	$ 5,347	$ 5,348	$ 5,316	$ 5,318	$ 5,313	$ 5,314	$ 5,280	$ 5,280	$ 4,946	$ 4,946	$ 21,401	$ 21,261	$ 20,452
RMR LLC | RMR, Inc | Membership Units | Subsequent Event
Class of Stock [Line Items]
Value of dividends	$ 5,391
Abp Trust | Membership Units | Subsequent Event | RMR LLC
Class of Stock [Line Items]
Shares owned (in shares)	15,000,000

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