Document and Entity Information Document - shares
3 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name SMART GLOBAL HOLDINGS, INC.  
Entity Central Index Key 0001616533  
Current Fiscal Year End Date --08-30  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Type 10-Q  
Trading Symbol SGH  
Document Period End Date Nov. 30, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   22,845,331