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Related Person Transactions - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015
HPT
Related Party Transaction [Line Items]
Aggregate incentive business management fees	$ 74,572	$ 52,407
SNH
Related Party Transaction [Line Items]
Aggregate incentive business management fees	55,740
SIR
Related Party Transaction [Line Items]
Aggregate incentive business management fees	$ 25,569
ABP Trust and Managed REIT
Related Party Transaction [Line Items]
Rental expense			$ 1,028	$ 1,050

X

- Definition

Represents the aggregate incentive business management fees.

+ References

No definition available.

+ Details

Name:	rmr_AggregateIncentiveBusinessManagementFees
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_HospitalityPropertiesTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rmr_SeniorHousingPropertiesTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rmr_SelectIncomeREITMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rmr_AbpTrustAndManagedReitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: