Document And Entity Information - USD ($)
12 Months Ended
Jun. 30, 2019
Nov. 30, 2019
Dec. 31, 2018
Document And Entity Information [Abstract]      
Entity Registrant Name Super Micro Computer, Inc.    
Entity Central Index Key 0001375365    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding (in shares)   50,085,282  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 596,876,261