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v3.20.2

Related Person Transactions - Other (Details) | 12 Months Ended
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Sep. 30, 2020
Percentage of Executives' Business Time Devoted to Services to Managed Operators |
Related Party Transaction [Line Items] |
Related party transaction percentage | 80.00%
Percentage of Executives' Cash Compensation Paid by Managed Operators |
Related Party Transaction [Line Items] |
Related party transaction percentage | 80.00%

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- Definition Related Party Transaction Percentage + References No definition available. + Details
Name: | rmr_RelatedPartyTransactionPercentage
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=rmr_PercentageofExecutiveBusinessTimeDevotedtoServicestoManagedOperatorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=rmr_PercentageofExecutivesCashCompensationPaidbyManagedOperatorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |