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Related Person Transactions - Tax Receivable Agreement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Related Party Transaction [Line Items] |  |  |
Payments under tax receivable agreement | $ 2,111 | $ 2,266 | $ 2,962
ABP Trust |  |  |
Related Party Transaction [Line Items] |  |  |
Tax receivable agreement tax benefit |  |  | 24,710
ABP Trust | Up C Transaction |  |  |
Related Party Transaction [Line Items] |  |  |
Tax receivable agreement, percent of payment | 85.00% |  |
Payments under tax receivable agreement | $ 2,111 | 2,266 | 2,962
Tax receivable agreement amount payable | 29,950 |  |
Tax receivable agreement obligations, current | 2,161 |  |
RMR LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Distributions paid | 16,606 | 41,099 | 47,940
RMR LLC | ABP Trust |  |  |
Related Party Transaction [Line Items] |  |  |
Distributions paid | 14,939 | 37,975 | 44,490
RMR LLC | ABP Trust and Managed REIT |  |  |
Related Party Transaction [Line Items] |  |  |
Distributions paid | $ 31,545 | $ 79,074 | $ 92,430

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- Definition Payments to Related Party, Tax Receivable Agreement + References No definition available. + Details
Name: | rmr_PaymentstoRelatedPartyTaxReceivableAgreement
Namespace Prefix: | rmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax Receivable Agreement Obligations, Current + References No definition available. + Details
Name: | rmr_TaxReceivableAgreementObligationsCurrent
Namespace Prefix: | rmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the carrying amount on the reporting date of the current and non current obligations relating to the tax receivable agreement. + References No definition available. + Details
Name: | rmr_TaxReceivableAgreementObligationsCurrentAndNoncurrent
Namespace Prefix: | rmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the percent of cash savings, if any, in US Federal, state and local income tax or franchise tax provided in the Tax Receivable Agreement with a related party. + References No definition available. + Details
Name: | rmr_TaxReceivableAgreementPaymentPercent
Namespace Prefix: | rmr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cash distribution paid to unit-holder of limited liability company (LLC). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Balance Type: | credit
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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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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- Details
Name: | dei_LegalEntityAxis=rmr_RMRLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |