Document and Entity Information
12 Months Ended
Jun. 30, 2018
Document And Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Jun. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Trading Symbol MESO
Entity Registrant Name MESOBLAST LTD
Entity Central Index Key 0001345099
Current Fiscal Year End Date --06-30
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Entity Common Stock, Shares Outstanding 482,639,654