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Revenue Recognition - Business Management Fees (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Managed Operators, ABP Trust and AIC |  |
Related Party Transaction [Line Items] |  |
Business management fee percent based on management agreements | 0.60% |
Aggregate business management fees | $ 6,872 | $ 6,539
AIC |  |
Related Party Transaction [Line Items] |  |
Business management fee percent based on total premiums paid | 3.00% |

X
- Definition Represents the amount of aggregate business management fees earned during the period. + References No definition available. + Details
Name: | rmr_AggregateBusinessManagementFees
Namespace Prefix: | rmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the business management fee percentage based on total premiums paid under active insurance underwritten or arranged by related party. + References No definition available. + Details
Name: | rmr_BusinessManagementFeePercentOfTotalPremiumsPaid
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the business management fee percentage based on the business management agreements. + References No definition available. + Details
Name: | rmr_BusinessManagementFeePursuantToManagementAgreementsPercent
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rmr_ManagedOperatorsAndAbpTrustAndAicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rmr_AffiliatesInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |