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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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