XML 68 R52.htm IDEA: XBRL DOCUMENT
v3.20.2

Related Person Transactions - Relationships Between Client Companies (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2020
Related Party Transaction [Line Items] |  |  |
Term of registration and lock up agreement | 10 years | 10 years |
TA |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 4.60%
Five Star |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 6.40%
SVC | TA |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 8.20%
SVC | Sonesta |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 33.90%
DHC | Five Star |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners |  |  | 33.90%

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- Definition Registration And Lock Up Agreement, Term Of Agreement + References No definition available. + Details
Name: | rmr_RegistrationAndLockUpAgreementTermOfAgreement
Namespace Prefix: | rmr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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: | srt_OwnershipAxis=rmr_TravelCentersOfAmericaLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=rmr_FiveStarQualityCareIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | srt_OwnershipAxis=rmr_SonestaInternationalHotelsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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