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Net Income Attributable to RMR Inc. (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Net Income Attributable to RMR Inc.        
Income before income tax expense $ 9,287 $ 11,048 $ 43,434 $ 36,704
RMR Inc. franchise tax expense and interest income (27) (107) (152) (354)
Net income before noncontrolling interest 9,260 10,941 43,282 36,350
Net income attributable to noncontrolling interest in The RMR Group LLC (4,545) (5,200) (21,033) (17,259)
Net loss attributable to other noncontrolling interests 354 91 1,142 344
Net income attributable to RMR Inc. before income tax expense 5,069 5,832 23,391 19,435
Income tax expense (1,899) (1,753) (7,149) (5,607)
RMR Inc. franchise tax expense and interest income 27 107 152 354
Net income attributable to The RMR Group Inc. $ 3,197 $ 4,186 $ 16,394 $ 14,182