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Related Party Transactions - Leases (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2016 USD ($) operating_lease	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Related Party Transaction [Line Items]
Number of operating leases | operating_lease	33
Rental expense	$ 4,650	$ 4,426	$ 4,581
ABP Trust and Managed REIT
Related Party Transaction [Line Items]
Number of operating leases | operating_lease	22
Rental expense	$ 4,213	$ 4,120	3,866
Notice to terminate lease (in days)	30 days
EQC
Related Party Transaction [Line Items]
Rental expense			$ 618

X

- Definition

Number of Operating Leases

+ References

No definition available.

+ Details

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X

- Definition

Represents the duration of notice period which the related party provides before the termination of lease agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmr_
Data Type:	xbrli:durationItemType
Balance Type:	na
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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

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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

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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