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Per Common Share Amounts	12 Months Ended
Per Common Share Amounts	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Per Common Share Amounts Earnings per common share reflects net income attributable to RMR Inc. divided by our weighted average common shares outstanding. Basic and diluted weighted average common shares outstanding represents our 15,082,432 Class A Common Shares and our 1,000,000 Class B‑1 Common Shares. Our Class B‑2 Common Shares, which are paired with ABP Trust’s Class A Units, have no independent economic interest in RMR Inc. The 15,000,000 Class A Units that we do not own may be redeemed for our Class A Common Shares on a one for one basis, or upon such redemption, we may elect to pay cash instead of issuing Class A Common Shares. Upon redemption of a Class A Unit, our Class B‑2 Common Share “paired” with such unit is cancelled for no additional consideration. If all outstanding Class A Units were redeemed for our Class A Common Shares in the periods presented our Class A Common Shares outstanding would have been 31,082,432. In computing the dilutive effect, if any, that the aforementioned redemption would have on earnings per share, we considered that net income available to holders of our Class A Common Shares would increase due to elimination of the noncontrolling interest (including any tax impact). For the period presented, such redemption is not reflected in diluted earnings per share as the assumed redemption would be anti‑dilutive.