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Revenue Recognition - Reimbursable Payroll Related and Other Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Reimbursable payroll related and other costs	$ 12,708	$ 9,150
Equity based compensation expense and related reimbursements	2,155	$ 1,062
TRMT
Related Party Transaction [Line Items]
Reimbursable payroll related and other costs	$ 375

X

- Definition

Represents reimbursable revenue derived from equity-based compensation awards associated with management services performed.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmr_
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Balance Type:	credit
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- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60722-111653

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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.

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- Details

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