XML 13 R1.htm IDEA: XBRL DOCUMENT v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Mar. 31, 2017
May 09, 2017
Entity Registrant Name RMR Group Inc.  
Entity Central Index Key 0001644378  
Document Type 10-Q  
Document Period End Date Mar. 31, 2017  
Amendment Flag false  
Current Fiscal Year End Date --09-30  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Class A common shares    
Entity Common Stock, Shares Outstanding   15,094,557
Class B-1 common shares    
Entity Common Stock, Shares Outstanding   1,000,000
Class B-2 common shares    
Entity Common Stock, Shares Outstanding   15,000,000