Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 22, 2019
Jun. 30, 2018
Document And Entity Information      
Entity Registrant Name Rosehill Resources Inc.    
Central Index Key 0001659122    
Document Type 10-K    
Trading Symbol ROSE    
Document Period-End Date Dec. 31, 2018    
Amendment Flag false    
Current Fiscal Year-End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Emerging Growth Company true    
Ex Transition Period false    
Small Business true    
Entity Shell Company false    
Entity Public Float     $ 27.2
Class A Common Stock      
Entity Common Stock, Shares Outstanding   13,760,136  
Class B Common Stock      
Entity Common Stock, Shares Outstanding   29,807,692