Name:	rmr_AccountsPayableAccruedLiabilitiesAndDepositsRelatedToShareBasedPaymentAwardsCurrentFairValueDisclosure
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value of current portion of amount due from related parties related to share based payment awards.

No definition available.

Name:	rmr_DueFromRelatedPartyRelatedToShareBasedPaymentAwardsCurrentFairValueDisclosure
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of noncurrent portion of amount due from related parties related to share based payment awards.

No definition available.

Name:	rmr_DueFromRelatedPartyRelatedToShareBasedPaymentAwardsNoncurrentFairValueDisclosure
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of noncurrent portion of employer compensation liability related to share based payment awards.

No definition available.

Name:	rmr_EmployerCompensationLiabilityRelatedToShareBasedPaymentAwardsNoncurrentFairValueDisclosure
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities which is included in cash and cash equivalents

No definition available.

Name:	rmr_MoneyMarketFundsFairValueDisclosure
Namespace Prefix:	rmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.