Document and Entity Information - shares
3 Months Ended
Sep. 30, 2018
Nov. 30, 2019
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-Q  
Document Period End Date Sep. 30, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Smaller Reporting Company false  
Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   50,085,282