Document and Entity Information Document - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Oct. 19, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name SMART GLOBAL HOLDINGS, INC.  
Entity Central Index Key 0001616533  
Current Fiscal Year End Date --08-31  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Shell Company false  
Entity Emerging Growth Company false  
Document Type 10-K  
Trading Symbol SGH  
Document Period End Date Aug. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus FY  
Amendment Flag false  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status No  
Entity Voluntary Filers No  
Entity Public Float   $ 376.7
Entity Common Stock, Shares Outstanding   22,605,548