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Organization (Details)	12 Months Ended
	Sep. 30, 2024 real_estate_investment_trust shares
Related Party Transaction [Line Items]
Number of managed trusts | real_estate_investment_trust	4
RMR LLC
Related Party Transaction [Line Items]
Ownership percentage	52.90%
Class B-1 common shares | AlerisLife
Related Party Transaction [Line Items]
Membership units (in shares)	1,000,000
Redeemable Class A membership units | AlerisLife
Related Party Transaction [Line Items]
Membership units (in shares)	15,000,000
Redeemable Class A membership units | RMR LLC | AlerisLife
Related Party Transaction [Line Items]
Ownership percentage	47.10%
Class A membership units | AlerisLife
Related Party Transaction [Line Items]
Membership units (in shares)	15,000,000
Class A membership units | Class A
Related Party Transaction [Line Items]
Membership units (in shares)	15,846,025
Capital Unit, Class B
Related Party Transaction [Line Items]
Membership units (in shares)	1,000,000

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