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Revenue Recognition - Property Management Fees (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deferred Revenue Disclosure [Abstract] |  |
Property management fee percent based on gross collected rents | 3.00% |
Property management fee percent based on the cost of construction | 5.00% |
Aggregate property management fees | $ 10,858 | $ 8,222

X
- Definition Represents the percentage of the cost of construction charged for property management fees. + References No definition available. + Details
Name: | rmr_PropertyManagementFeeConstructionSupervisionPercent
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of gross collected rents charged for property management services. + References No definition available. + Details
Name: | rmr_PropertyManagementFeeGrossCollectedRentsPercent
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredRevenueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeeRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration