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Per Common Share Amounts - Schedule of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Numerator:    
Net income attributable to RMR Inc. $ 71,120 $ 23,510
Income attributable to unvested participating securities (457) (84)
Net income attributable to RMR Inc. used in calculating basic EPS $ 70,663 $ 23,426
Denominator:    
Weighted average common shares outstanding - basic (in shares) 16,060 16,025
Net income attributable to RMR Inc. per common share - basic (in dollars per share) $ 4.40 $ 1.46
Numerator:    
Net income attributable to RMR Inc. $ 71,120 $ 23,510
Income attributable to unvested participating securities (457) (84)
Net income attributable to RMR Inc. used in calculating diluted EPS $ 70,663 $ 23,426
Denominator:    
Weighted average common shares outstanding - basic (in shares) 16,060 16,025
Dilutive effect of incremental unvested shares (in shares) 24 3
Weighted average common shares outstanding - diluted (in shares) 16,084 16,028
Net income attributable to RMR Inc. per common share - diluted (in dollars per share) $ 4.39 $ 1.46