| Document and Entity Information | Sep. 24, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001616533 |
| Document Type | 8-K |
| Document Period End Date | Sep. 24, 2021 |
| Entity Registrant Name | SMART GLOBAL HOLDINGS, INC. |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 001-38102 |
| Entity Tax Identification Number | 98-1013909 |
| Entity Address, Address Line One | c/o Maples Corporate Services Limited |
| Entity Address, Address Line Two | P.O. Box 309 |
| Entity Address, City or Town | Ugland House |
| Entity Address, Region | Grand Cayman |
| Entity Address, Postal Zip Code | KY1-1104 |
| Entity Address, Country | KY |
| City Area Code | (510) |
| Local Phone Number | 623-1231 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class shares, $0.03 par value per share |
| Trading Symbol | SGH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
