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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

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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: