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Shareholders’ Equity - Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 14, 2022
Feb. 17, 2022
Nov. 18, 2021
Feb. 18, 2021
Nov. 19, 2020
Mar. 31, 2022
Mar. 31, 2021
Class A and B-1 common shares              
Class of Stock [Line Items]              
Dividends paid (in usd per share)   $ 0.38 $ 0.38 $ 0.38 $ 0.38 $ 0.76 $ 0.76
Value of dividends   $ 6,265 $ 6,264 $ 6,230 $ 6,230 $ 12,529 $ 12,460
Subsequent Event | Class A and B-1 common shares              
Class of Stock [Line Items]              
Value of dividends $ 6,601            
Dividends declared (in usd per share) $ 0.40            
Subsequent Event | Membership Units | RMR LLC              
Class of Stock [Line Items]              
Shares owned (in shares) 16,501,536            
RMR LLC | Membership Units              
Class of Stock [Line Items]              
Dividends paid (in usd per share)   $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.60 $ 0.60
Value of dividends   $ 9,446 $ 9,446 $ 9,419 $ 9,419 $ 18,892 $ 18,838
RMR LLC | Subsequent Event | Membership Units              
Class of Stock [Line Items]              
Value of dividends $ 10,080            
Dividends declared (in usd per share) $ 0.32            
RMR LLC | RMR, Inc | Membership Units              
Class of Stock [Line Items]              
Value of dividends   4,946 4,946 4,919 4,919 9,892 9,838
RMR LLC | RMR, Inc | Subsequent Event | Membership Units              
Class of Stock [Line Items]              
Value of dividends $ 5,280            
RMR LLC | ABP Trust | Membership Units              
Class of Stock [Line Items]              
Value of dividends   $ 4,500 $ 4,500 $ 4,500 $ 4,500 $ 9,000 $ 9,000
RMR LLC | ABP Trust | Subsequent Event | Membership Units              
Class of Stock [Line Items]              
Value of dividends $ 4,800            
ABP Trust | Subsequent Event | Membership Units | RMR LLC              
Class of Stock [Line Items]              
Shares owned (in shares) 15,000,000